Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b4c79d5f6b4ec08…

MALICIOUS

PDF

70.7 KB Created: 2020-11-23 04:09:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 52c3633456d8a225a8db90b50383c8f0 SHA-1: 7d2cd003c2e7723bd2ec318d64c25e4754fd1cfa SHA-256: 5b4c79d5f6b4ec0827e0769ed7b875fe8bb8ecdef9955afa14b28fe14dc9b433
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with one heuristic specifically identifying a 'PDF link farm' pointing to a suspicious Amazon S3 URL. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and external link farm suggest it's used to redirect users to potentially malicious sites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://traffnew.ru/123?utm_term=geet+engine+wikipedia PDF link annotation
    • https://suganolorifumu.weebly.com/uploads/1/3/0/8/130814011/mizikix_bisatezi_nepinek_bebixakewos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418401/normal_5f98868bed4ab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/leguvefu/xovimuxikoligoziputo.pdfIn PDF document text
    • https://s3.amazonaws.com/vabemavuputenif/gojogavojobalivus.pdfIn PDF document text
    • https://s3.amazonaws.com/ravuxudibure/85275186459.pdfIn PDF document text
    • https://s3.amazonaws.com/labitajaxatufib/metodologia_de_auditoria_de_sistemas_de_informao.pdfIn PDF document text
    • https://s3.amazonaws.com/pizexopenaxu/52098484493.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxenipup/jukuwovemop.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/93833870913.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed2885c7-7d14-4a5a-b057-a270a382beff/56830912391.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2bb7954-7cef-42af-9f52-e4cf5ec72b27/pibederajunuwore.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c2d36c9-cfaf-42dd-9aa6-e9bc45b183ad/ford_probe_gt_engine_for_sale.pdfIn PDF document text
    • https://s3.amazonaws.com/mupukesunobaga/chama_chama_song_video_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/bulozor/gupigitonepesivunumobevu.pdfIn PDF document text
    • https://s3.amazonaws.com/genedesowul/it_chapter_2_google_drive_mp4_free.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_off0000d6ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BA 5008 bytes
SHA-256: 751506a5565a55fd0c26df50fd96021fae65c51621aca8700e7f1de5078c732d
font_01_sfnt_off0000e7f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F8 10860 bytes
SHA-256: d6f79937f847aa585af3aea80bd14f055dac202123b313064a82090ab198b4eb

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