Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fe168125e483a26…

MALICIOUS

PDF

79.3 KB Created: 2021-03-29 00:12:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 0dca42f0bb71022be5bdc4f9df33bf95 SHA-1: 7b18d348c17fd19c2dd2949b26289144ea6da473 SHA-256: 4fe168125e483a2608ab40138d1d1a69ee28a12b09527c8f32ea9a89f8a3a4f9
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards techniques used to obscure malicious content and redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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/strik?utm_term=avaya+one+x+communicator+user+guide PDF link annotation
    • https://wivixape.weebly.com/uploads/1/3/4/8/134897282/15e60ce58e8d.pdfIn PDF document text
    • https://dizoxagesok.weebly.com/uploads/1/3/4/3/134363212/mipuzinemu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412415/normal_6042bc79c777a.pdfIn PDF document text
    • https://cdn.sqhk.co/kurazagizub/XjbRzje/vietnamese_visa_on_arrival_application_form.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475874/normal_5fde2e4763a57.pdfIn PDF document text
    • https://tifimiwarefimi.weebly.com/uploads/1/3/4/8/134895051/8c056324.pdfIn PDF document text
    • https://winokagadav.weebly.com/uploads/1/3/2/7/132740598/b499609c4ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495413/normal_602b2ee190e11.pdfIn PDF document text
    • https://buvonage.weebly.com/uploads/1/3/0/9/130969236/6617836.pdfIn PDF document text
    • https://cdn.sqhk.co/zivuwimavez/9iaZggo/chess_rush_meta_season_7.pdfIn PDF document text
    • https://vawoxaju.weebly.com/uploads/1/3/1/3/131379227/xofomo.pdfIn PDF document text
    • https://lurusinobafor.weebly.com/uploads/1/3/2/7/132710654/12c180e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368978/normal_601929f688e83.pdfIn PDF document text
    • https://cdn.sqhk.co/masamiwe/71icgh0/kobewosesenineroxeg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483867/normal_601d9a5e8d008.pdfIn PDF document text
    • https://fokutape.weebly.com/uploads/1/3/2/8/132814024/7ede7f.pdfIn PDF document text
    • https://cdn.sqhk.co/wujakegu/Sihsja7/survival_skills_book.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
    • https://010f2e21-25ca-4560-806d-08cbbb7c7db1.filesusr.com/ugd/74a852_44e43a873507431cbb1476a8d78d71ce.pdf?index=trueIn PDF document text
    • https://6129906d-bc82-46a7-99f5-71793a58af3c.filesusr.com/ugd/d162e3_b614b5fb8f354449a6d8250b4abe095c.pdf?index=trueIn PDF document text
    • https://901b9152-9067-49c5-8541-bb90c1a77dfa.filesusr.com/ugd/5d84e8_7131e289575b49888c6c1f8a10d86bff.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jevedijadiki/arizer_extreme_q_vaporizer_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/niwotipugonuvoz/51965573794.pdfIn PDF document text
    • https://s3.amazonaws.com/dinigugaxej/namaf.pdfIn PDF document text
    • https://s3.amazonaws.com/legipalofi/karuzasasam.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FE 5328 bytes
SHA-256: 103274ca2056cec92539668bb78eb6fec268835477f827a10d7e63d7cfa3ac29
font_01_sfnt_off0000fa11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA11 11064 bytes
SHA-256: 588b756c3e2a14fd4af3ccb7f1d569598a7c67864a6c4d8d75e0aa37578b5509
font_02_sfnt_off00011fef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FEF 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3