Malicious PDF — malware analysis report

Static analysis result for SHA-256 2863a31a1c7f00f5…

MALICIOUS

PDF

101.1 KB Created: 2021-02-11 09:34:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 022bc35829607ba67ef04fbe292efcb5 SHA-1: 8965aaa1f4da65168f52a30fde4723b8fcd1d4fe SHA-256: 2863a31a1c7f00f5dc1f61449275a55f305c1e7ca3ceed14c3084e2bc66aa6ee
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains or subdomains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the exploitation of PDF vulnerabilities or social engineering to lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://jacksth.ru/aws?utm_term=teks+sholawat+burdah+pdf PDF link annotation
    • https://cdn.sqhk.co/jupozaregu/fhbgjhb/bekonizuvijori.pdfIn PDF document text
    • https://rimofemosi.weebly.com/uploads/1/3/4/3/134351632/99ba609939b.pdfIn PDF document text
    • http://tipaxoj.66ghz.com/thesis_proposal_latex_template.pdfIn PDF document text
    • https://gigatadozewat.weebly.com/uploads/1/3/1/6/131606492/2534760.pdfIn PDF document text
    • http://vuvuga.xyz/loposaxemus97.pdfIn PDF document text
    • http://creamwalls.online/corporate_communication_a_guide_to_theory_and_practice_5th_edition_free37lcs.pdfIn PDF document text
    • https://bativizamazon.weebly.com/uploads/1/3/4/7/134770744/pigexa.pdfIn PDF document text
    • https://jolezutixuzusav.weebly.com/uploads/1/3/4/6/134605000/roterokofi_selenakat_ribuba.pdfIn PDF document text
    • https://tumunonapuve.weebly.com/uploads/1/3/1/3/131379134/9049184.pdfIn PDF document text
    • https://cdn.sqhk.co/tefulobesa/9ge9heQ/63228841197.pdfIn PDF document text
    • http://salearea.pro/toxifelaf7hk0i.pdfIn PDF document text
    • https://cdn.sqhk.co/zivalutapa/gdztjhZ/cartoon_video_creator_app_download.pdfIn PDF document text
    • https://rodefakuwutepez.weebly.com/uploads/1/3/4/3/134341390/tekojufikekama-borukekasolaniw-fudobewodapiged-silojiwigepi.pdfIn PDF document text
    • https://ralirepiputup.weebly.com/uploads/1/3/4/8/134852471/35164a2556.pdfIn PDF document text
    • https://cdn.sqhk.co/najafizox/gehazxk/birthday_card_app_for_iphone.pdfIn PDF document text
    • https://gexuguxibam.weebly.com/uploads/1/3/2/6/132696321/b0282f52946.pdfIn PDF document text
    • https://cdn.sqhk.co/rokunufoleti/iqWjho1/9363389872.pdfIn PDF document text
    • http://migriruy.ru/98964700701wt12b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://renedutej.rf.gd/46986497614.pdfIn PDF document text
    • http://palalujopaxuv.epizy.com/7454805325.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001489e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1489E 26580 bytes
SHA-256: 67c27e6d95dcf317f88769ebf49351b5fd6a627690033c6ca793e40d54f0d0a7
font_00_sfnt_off000105e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E3 3556 bytes
SHA-256: 52662eeede725238f2325381e231ccf43876213e9d49fb001335a76518be6469
font_01_sfnt_off00011267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11267 5104 bytes
SHA-256: 725d5e0340bd9e011dc772ad6a90814a13792d3a4aff6830a4f2bd6eca6fb610
font_02_sfnt_off000123e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E6 10864 bytes
SHA-256: b804aeb0fd3858542fdba6572433db9b7f77e65039e844f7654244d3fd9015fd
font_04_sfnt_off00017846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17846 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378