Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8b6ca0d16b627e0…

MALICIOUS

PDF

68.8 KB Created: 2021-04-07 18:04:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 1e20fbacf0799b14ecf19ebb32efc7a7 SHA-1: ebeb044586399dc381387387a2e369812ddd3784 SHA-256: b8b6ca0d16b627e0f1a2c54ae3398625199c2a9a043a89f3966c93b919543555
186 Risk Score

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/wix?keyword=pearson+education+plate+tectonics+chapter+test+answer+key PDF link annotation
    • https://kasezikibojeg.weebly.com/uploads/1/3/1/8/131871727/0244e6872.pdfIn PDF document text
    • http://mapotilij.mygamesonline.org/22952052468.pdfIn PDF document text
    • https://kokujefep.weebly.com/uploads/1/3/1/4/131409677/xageketes.pdfIn PDF document text
    • http://bagidopivulo.mywebcommunity.org/transatlantic_slave_trade_definition.pdfIn PDF document text
    • http://gapagal.mywebcommunity.org/rumosiw.pdfIn PDF document text
    • http://manidat.sportsontheweb.net/frozen_shoulder_physiotherapy_management.pdfIn PDF document text
    • https://dowozazufexu.weebly.com/uploads/1/3/4/6/134606261/2291881.pdfIn PDF document text
    • https://dojobojijiwum.weebly.com/uploads/1/3/2/6/132681334/24379.pdfIn PDF document text
    • http://tokesuditetu.getenjoyment.net/atonia_uterina.pdfIn PDF document text
    • https://xuzomavarek.weebly.com/uploads/1/3/1/3/131383242/8057400.pdfIn PDF document text
    • http://kisagek.22web.org/89196579440.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9d4035e-4dac-4d33-82d9-233f200185cc/how_to_use_apple_cider_vinegar_to_brush_teeth.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81f46019-d389-4d42-b0e1-462ec502424d/52064572566.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0df9a8bf-09f1-4c03-9563-4a889b2272ad/black_and_decker_mouse_sander_sandpaper.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/396a10aa-2bb7-457c-8be9-9f0a31fdd165/96473512240.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a006d7c-0fa2-49d0-ae58-493be19029ab/61936342420.pdfIn PDF document text
    • http://pogugule.epizy.com/panasonic_dect_6.0_plus_3-handset_expandable_digital_cordless_phone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a81236e9-9311-471a-ad64-6083901c816e/sidijukilirabiwidenisub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0deb4126-1fe6-4490-aba1-3dee32e8870a/xipudinikagerutuw.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d11c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD11C 5420 bytes
SHA-256: d27dce023f70535f515fd1d0d52c1eaa7fad3c0753e7f8d34ec2ae60bb8fb74c
font_01_sfnt_off0000e39b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39B 10124 bytes
SHA-256: f948f7557081dadc430cd362d7faec8e50c2b9370f88d75c271eab60eefbe8ac