Malicious PDF — malware analysis report

Static analysis result for SHA-256 d862bc56e5f52b6f…

MALICIOUS

PDF

90.9 KB Created: 2021-03-08 20:50:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 2333a1248aa3cf3a7cd008d415708749 SHA-1: fe826543dc0a83e1cb0efb426a938c6dacfd76cc SHA-256: d862bc56e5f52b6f73198850554264b623b9781454b3c502602e716611225a4c
312 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. It impersonates Microsoft, directing users to a redirector URL that ultimately leads to a credential phishing page, indicating a spearphishing attachment attack. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://duvozeja.weebly.com/uploads/1/3/0/7/130739152/6e0ad65.pdf.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://yafferge.ru/award?keyword=modele+attestation+de+stage+de+formation+pdf In PDF document text
    • https://cdn.sqhk.co/rapawaferew/ihSgjng/sim_dashboard_ios_free.pdfIn PDF document text
    • https://cdn.sqhk.co/fapolokid/idjd2vL/sitajukopig.pdfIn PDF document text
    • https://duvozeja.weebly.com/uploads/1/3/0/7/130739152/6e0ad65.pdfIn PDF document text
    • https://biweworu.weebly.com/uploads/1/3/4/5/134525234/27f595e1cd.pdfIn PDF document text
    • https://fufopijubotuxo.weebly.com/uploads/1/3/1/3/131381544/3981661.pdfIn PDF document text
    • https://tupirusu.weebly.com/uploads/1/3/4/7/134702138/sobasower.pdfIn PDF document text
    • https://vupebuxotilejo.weebly.com/uploads/1/3/0/8/130814562/tokivizumameb.pdfIn PDF document text
    • https://lepitedow.weebly.com/uploads/1/3/4/8/134885181/polalonap.pdfIn PDF document text
    • https://bujabofilurukok.weebly.com/uploads/1/3/2/6/132682168/kiven-ralavo-vizemopezekurug.pdfIn PDF document text
    • https://juposuwidamad.weebly.com/uploads/1/3/1/4/131406248/wosefizujetaboz.pdfIn PDF document text
    • https://jivexirod.weebly.com/uploads/1/3/4/7/134707467/595498737b2019.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dobesogum/tukikinakitepep.pdfIn PDF document text
    • https://161abad2-7de2-49bb-9904-d6e2a620a662.filesusr.com/ugd/2eec94_814c4fd8c37f4553a4781006a1dbba0f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mubemutolewe/a_level_mathematics_past_papers.pdfIn PDF document text
    • https://9539e3d7-93ad-434a-85ac-22bd9bdb82bb.filesusr.com/ugd/df7b34_877ef43065f54795b6541c4c23483574.pdf?index=trueIn PDF document text
    • https://61249681-e2d1-4375-841a-b3723294d79c.filesusr.com/ugd/3d514e_51aee3801b09408d9d1b299620a2cea6.pdf?index=trueIn PDF document text
    • https://8f1c0ae7-1ba6-4c51-a623-4d29f5e3aebb.filesusr.com/ugd/c1615c_0da8cef45a10408bb3070b2250af160f.pdf?index=trueIn PDF document text
    • https://b5526579-b22d-45a0-8251-9885a72cf3eb.filesusr.com/ugd/0cd019_45a6b01574994405bd1df8ca1090d53e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dagasopones/what_does_a_sales_operations_specialist_do.pdfIn PDF document text
    • https://55d63786-14d6-44de-84d0-33f1fb383c44.filesusr.com/ugd/45fd81_96447cd5046d4ac9941ca06b31b6f351.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11127 5364 bytes
SHA-256: d63fd9409abc5a344cc19eaf09862c8bef872efa545f98216fa1c9600157d933
font_01_sfnt_off00012360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12360 10964 bytes
SHA-256: b897e03907155c61794e3652f3481ad770b1f2b2aea2300e0f599858f2bc6ba5
font_02_sfnt_off00014911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14911 16080 bytes
SHA-256: 3c98c78c42b1a46d25d63acc61fb2d4d6b2ec9908a0b549f000417ecb85dbf47

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