Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ef2dfc6f05babd6…

MALICIOUS

PDF

75.2 KB Created: 2021-03-25 11:40:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: ad17beed8100320a854c4985914f8d83 SHA-1: 60d454687bb7ac433da26be0c8a90c5aab1ce058 SHA-256: 3ef2dfc6f05babd60e2f1768d3008949ea5e1a15cef70448fe17be83b608c324
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, many pointing to disposable hosting, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xezojetit.ru/strik?utm_term=central+pneumatic+air+compressor+8+gallon+parts PDF link annotation
    • http://jekebes.iblogger.org/98653037376.pdfIn PDF document text
    • http://help-lnstagramcopyrights-verify.com/novatel_mifi_6620l_batterydlq6p.pdfIn PDF document text
    • http://on-arenas.com/13640428304k2q2w.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zerakunutage.epizy.com/vonuwofaw.pdfIn PDF document text
    • https://e4034479-4ead-418b-af8c-5be8dc72bdbe.filesusr.com/ugd/1e8759_1bfce2ee70b8436485a08853b9f2c7c4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wamatasamegu/ferariwadozalona.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3845ca5f-7842-4fec-8ff6-bac456dba3d6/art_phd_proposal_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d98325ef-3b09-40d8-9f7c-68c85ebe5fdc/cool_aa_meeting_topics.pdfIn PDF document text
    • https://6c8027e1-9878-41b3-a9ef-32ba2b6bcd02.filesusr.com/ugd/185811_41c52112cf4e4a63882a4a3f22a82db0.pdf?index=trueIn PDF document text
    • https://e57d8632-f742-4524-ada6-9cdf759d9f13.filesusr.com/ugd/b0cb2d_42325daaccae439298d16e13f8f59475.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/22e59413-997a-4bad-988a-1834536e2f34/91875367398.pdfIn PDF document text
    • https://cee4a208-09ac-40e0-983f-4c2cc776acbe.filesusr.com/ugd/5ed537_6891b92a365d405a94ad0bfa5aaa3bc3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba56537f-927b-4428-b2ab-a34b47576b1f/what_is_vineland_adaptive_behavior_scales.pdfIn PDF document text
    • https://s3.amazonaws.com/jobavo/dumelugoxur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/034cafa3-7677-487a-83df-78b16a886bf0/instep_bike_trailer_coupler_walmart.pdfIn PDF document text
    • http://tesoravibeje.epizy.com/meaning_of_development_bank.pdfIn PDF document text
    • https://d0275d90-c5b4-4c72-b581-d0e2b62fc6dd.filesusr.com/ugd/ee54da_a97a2c57b2d54e6497abd0522c8c6cb2.pdf?index=trueIn PDF document text
    • https://6648aa49-deb3-4d6f-81a8-a63cc7a297fb.filesusr.com/ugd/38eac1_f9bd7f0f73734206adf697208f5353b2.pdf?index=trueIn PDF document text
    • https://72b50e20-f79f-40ca-96b4-24bef83e308f.filesusr.com/ugd/1a1092_48239fdc870d433487d504fbd0c6a46d.pdf?index=trueIn PDF document text
    • https://61069a5e-3c5f-4884-a3c7-8c7552058b74.filesusr.com/ugd/0789d5_4146a27e8a8946098674601bb7b16a21.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE796 5352 bytes
SHA-256: 189f6bb1cdffdb3764745b78f07ae3dc1f858d040bf658830dd2ea280c9254a4
font_01_sfnt_off0000f9a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A8 11140 bytes
SHA-256: 3a4c073408bb931e85d9a0cb7e0983d1b9ee803772d1cf0d60cfc11f8b99e5d5