Malicious PDF — malware analysis report

Static analysis result for SHA-256 4219d2ee7deca059…

MALICIOUS

PDF

79.2 KB Created: 2021-03-23 11:51:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 017f6dfc291d73818fd19d007df69ff0 SHA-1: b366fceac3d7a55b0e44260ca56a03517da1fbc0 SHA-256: 4219d2ee7deca059628c4e83e5afcc159d9ee5a79abb99b269b6ce9f68f4a97a
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lozipotod.ru/strik?utm_term=area+compound+shapes+worksheet+answer+key+math+aids PDF link annotation
    • https://cdn.sqhk.co/zalivelo/jiiChiM/86489415370.pdfIn PDF document text
    • https://cdn.sqhk.co/vopunokapire/FjiBhd7/38194695742.pdfIn PDF document text
    • http://guitar.su/675498002839kh00.pdfIn PDF document text
    • http://savadaqwe.space/craftsman_garage_door_opener_replacement_remote_controlhfx7z.pdfIn PDF document text
    • http://0fruits.space/assassin_creed_revelation_bug_graphiquenzdre.pdfIn PDF document text
    • https://cdn.sqhk.co/jidevumedure/jdGxgha/satatirakiforifofipebiwil.pdfIn PDF document text
    • https://cdn.sqhk.co/lexijunibul/bhdijii/cosmic_rays_meaning_in_marathi.pdfIn PDF document text
    • https://cdn.sqhk.co/nivatasob/c1wJHlx/nodegixiloze.pdfIn PDF document text
    • https://cdn.sqhk.co/mawejoxejobe/GGQQibj/vitamin_d_side_effects_anxiety.pdfIn PDF document text
    • http://ruszaimclub.ru/gujuxalipezabinobfnq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d4f1f58f-bd44-402a-a4b0-a3aa01e36dbf.filesusr.com/ugd/dffefa_e6b1814f650b4ea3bed6a5c14ab9a5a9.pdf?index=trueIn PDF document text
    • https://528a8416-53f4-4693-bcf0-540471887af1.filesusr.com/ugd/c3aa89_d31d1b7c8171465db8bf7e4dcb78eb5d.pdf?index=trueIn PDF document text
    • https://b9eb3541-094c-4606-b101-17c2291fd6e1.filesusr.com/ugd/a18601_5c3cced16f26441e80f963e65a653a20.pdf?index=trueIn PDF document text
    • https://b9264059-5ce6-458a-812b-58b21e0c51d1.filesusr.com/ugd/9a3dc1_7f8e4b09af3343f18fe012d2f8de78d2.pdf?index=trueIn PDF document text
    • https://a1d1c4ac-cf1d-4c58-861c-45d1188f4b60.filesusr.com/ugd/052f3a_bcc9168273d7469da96920b846826143.pdf?index=trueIn PDF document text
    • https://a161ff94-1a6f-4367-b6f8-8e513a5e676d.filesusr.com/ugd/4c7633_c15e0d12e4db4a1591092959f2d156ad.pdf?index=trueIn PDF document text
    • https://63c5840e-267c-49ed-94d3-fc9f9d8b9c0b.filesusr.com/ugd/8c5bc8_9eacebeee7074ff288dfd08af4d63f84.pdf?index=trueIn PDF document text
    • https://189c2d36-84ff-4b81-9465-96c33c1d3b91.filesusr.com/ugd/35ddae_315eb849d1b14462b73b9bd35962225d.pdf?index=trueIn PDF document text
    • https://627ea4a7-3f28-4bf3-8c99-6a9da7dacf48.filesusr.com/ugd/1970e2_a4be510d9b4045b294966665236e53e6.pdf?index=trueIn PDF document text
    • https://5e54824a-8208-41b0-8aeb-7c017e8cfb46.filesusr.com/ugd/f64db8_797daf3cd65c42c9baa711a61bd60a6b.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_off0000efe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE5 5528 bytes
SHA-256: 1c3720b2b0c0fab2f9deae69bcc1a715cd592d088c514e691344e686c88c3b88
font_01_sfnt_off00010298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10298 12748 bytes
SHA-256: 70cdb4188be251f9338bf643a85542ac7542b9368339573072701527fe3c45a7