Malicious PDF — malware analysis report

Static analysis result for SHA-256 9538ffd86e39d0fd…

MALICIOUS

PDF

101.3 KB Created: 2020-12-04 21:36:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 91eaef8aa817da0099f277d9f53d382d SHA-1: 10cbf8ef1d52add76af59e5c711daebe84224990 SHA-256: 9538ffd86e39d0fd5cf1e455964c1ab1993882153c7f2a8f88b414f8d035e2eb
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://traffmen.ru/aws?utm_term=beach+buggy+racing+premium+apk+2017 In PDF document text
    • https://redunexodozik.weebly.com/uploads/1/3/0/8/130814050/valiwadelel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368500/normal_5fc3085d20347.pdfIn PDF document text
    • https://mufuxavezefajox.weebly.com/uploads/1/3/4/4/134497947/gesimow_vimoxebekiz_relukit_saxapu.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/4d5351fbb209c0.pdfIn PDF document text
    • https://tilobumofiraji.weebly.com/uploads/1/3/4/4/134492377/paxakufonevivitodo.pdfIn PDF document text
    • https://kinijenu.weebly.com/uploads/1/3/4/6/134641264/9613470.pdfIn PDF document text
    • https://mavixozumag.weebly.com/uploads/1/3/4/8/134891478/folipe-sukufufapod.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/bejeseja/rubik_s_cube_cfop.pdfIn PDF document text
    • https://s3.amazonaws.com/vexosafugunu/96659884463.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76656cda-9ed8-44e0-b267-ee0ae050922f/ninja_fighting_games_unblocked.pdfIn PDF document text
    • https://s3.amazonaws.com/zowejunef/35891823496.pdfIn PDF document text
    • https://s3.amazonaws.com/jezobasit/41456582936.pdfIn 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000128ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128EF 2880 bytes
SHA-256: aff11289bf87f92bc53c0e2abc335208e29b6db8a954e82fd0a5595ffa95d344
font_01_sfnt_off0001332d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1332D 5900 bytes
SHA-256: d96faf39485932d4e542a6c903c7719e25b813fc28b8725e9be7eff784f7260c
font_02_sfnt_off00014732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14732 11836 bytes
SHA-256: 50045220157da0b5e1622ebc356e657a6d42a792746d8dd18714649d90622305
font_03_sfnt_off00016ff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FF6 16220 bytes
SHA-256: c62219a60afb6bf01b98a627255c640996da3c1acd408d4371030eed31eb6fc8

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