Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6719e6d2ee033f6…

MALICIOUS

PDF

74.7 KB Created: 2021-03-23 20:02:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 23856615da80d7ab37705277057c4381 SHA-1: b26832bdf24321592108ad49e9c795327f2e3b97 SHA-256: e6719e6d2ee033f64dc6fd9739cce3b6411e52157eaae17ab53cc75842c05b1a
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV detected this file as a phishing trojan, and the ML classifier also flagged it as malicious. While no scripts were explicitly extracted, the structure suggests it may be used to distribute further malicious content or lead users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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 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://dafemum.ru/wix?keyword=atom+worksheets+for+middle+school
    • https://cdn.sqhk.co/vojasipi/ggiahd0/slicer_software_cura.pdf
    • https://numeroluxovuz.weebly.com/uploads/1/3/4/7/134733954/wadub.pdf
    • https://cdn-cms.f-static.net/uploads/4465007/normal_603410d58fb31.pdf
    • https://cdn.sqhk.co/migawudewiw/8jeBDuL/enlighted_sensor_datasheet.pdf
    • https://cdn-cms.f-static.net/uploads/4497372/normal_603b043f96e8c.pdf
    • https://cdn-cms.f-static.net/uploads/4495240/normal_600d87b77de68.pdf
    • https://wizenifove.weebly.com/uploads/1/3/4/3/134308138/f8ee5ab2d7.pdf
    • https://dogerisu.weebly.com/uploads/1/3/0/8/130874322/nuvukokij-vegikexoxegirap.pdf
    • https://nagiliju.weebly.com/uploads/1/3/1/4/131412426/jodirurisevoxovo.pdf
    • https://cdn.sqhk.co/wafepazi/faYhcia/arsene_lupin.pdf
    • https://fopulowaledini.weebly.com/uploads/1/3/1/6/131637921/kugusune_vujaz_sisosebevakob.pdf
    • https://gafojeted.weebly.com/uploads/1/3/1/4/131452963/dadofami-tazimogego.pdf
    • http://shoppingyxplus.xyz/sizazimijugutukelowv949s.pdf
    • http://spainwow.pro/basketball_drills_for_high_school_studentsxncj2.pdf
    • https://konomotawet.weebly.com/uploads/1/3/1/3/131379362/mogegawijajozog-wudavowutetejot-lifuduxozi-damaluregekabo.pdf
    • https://cdn.sqhk.co/nimuxugemu/hjVjagh/vibirifosukorunolusita.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/82205ae6-b1c5-4c85-b83a-2ef8215050d2/bupasetaxexoruwemosuzi.pdf
    • https://uploads.strikinglycdn.com/files/07affffa-1cc8-45db-9d9b-ac9a3350ffce/21983269643.pdf
    • https://uploads.strikinglycdn.com/files/0665582f-2e6c-42d0-875b-edd72786b4f8/organic_chemistry_john_mcmurry_7th_edition_solutions_manual.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d99d.bin
1bc7b8aca6d1ceca1327758545ffcc31357dccbb2e12f0e4f328864a63e66ca2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD99D 4876 bytes
font_01_sfnt_off0000ea46.bin
91d4d1b9fcccee5cc4403483d77aeb438a32aad667bcb38daef1c8fdd8b5e2cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA46 10896 bytes
font_02_sfnt_off00010f61.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F61 4324 bytes

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