Malicious PDF — malware analysis report

Static analysis result for SHA-256 a89e26a713f491cc…

MALICIOUS

PDF

69.9 KB Created: 2021-06-07 01:18:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: b04dffbe5c0867bb9808230b5b10e2b5 SHA-1: 0eb27a1ca987e92280354edc386ae79e5455a06c SHA-256: a89e26a713f491cc169452bb081c60228f864e7ae6657e58f9e39a9870863075
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users to potentially harmful sites.

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://smidgel.ru/pbw?utm_term=pci+reproducible+world+history+shorts+2+answers PDF link annotation
    • https://fopozawiluni.weebly.com/uploads/1/3/4/3/134383369/6881686.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369914/normal_60519fec403a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374199/normal_6023f5993b428.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374360/normal_5fed6031123da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446942/normal_6068c1b778da0.pdfIn PDF document text
    • https://likixolokezixi.weebly.com/uploads/1/3/0/7/130738950/71cff5e60.pdfIn PDF document text
    • https://nutumavu.weebly.com/uploads/1/3/5/4/135400781/07da0850c17f6.pdfIn PDF document text
    • https://jolezutixuzusav.weebly.com/uploads/1/3/4/6/134605000/8537867.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494166/normal_604676e26c0ac.pdfIn PDF document text
    • https://nitowapesapu.weebly.com/uploads/1/3/4/4/134442046/410709b60.pdfIn PDF document text
    • https://fogazinug.weebly.com/uploads/1/3/7/5/137503451/d7a002e899bf.pdfIn PDF document text
    • https://jedarixires.weebly.com/uploads/1/3/0/9/130969076/bilawut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369506/normal_6069272e07a90.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448740/normal_602536aab9b55.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393204/normal_6012bb3136f95.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kemulosomul.pbworks.com/f/62884553444.pdfIn PDF document text
    • http://dibesusajob.pbworks.com/f/how_to_use_charcoal_briquettes.pdfIn PDF document text
    • http://zuvuzut.pbworks.com/f/liste_des_verbes_du_premier_groupe_en_francais.pdfIn PDF document text
    • http://lugozamuxika.pbworks.com/w/file/fetch/144564621/lesson_2.5_practice_c_geometry_answers.pdfIn PDF document text
    • http://jobagej.pbworks.com/f/55611049803.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_off0000d40c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD40C 5628 bytes
SHA-256: 7224a8e3cbaf2d36a1fdf0ffd76aa8a2a810044d59e0df05a98bb28322a02d72
font_01_sfnt_off0000e737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE737 10236 bytes
SHA-256: f65ee6148c65966e1191a2f95d0776fd81c218049ca532ef14c4370234396a86