Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff29f9f7b1411b25…

MALICIOUS

PDF

86.4 KB Created: 2021-01-13 11:13:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 6c6744f9b95e0f319ffe4cd6e2a788a0 SHA-1: a68ae81161b9098a185a05594390aaa4c3c123f5 SHA-256: ff29f9f7b1411b25c708f2ef6208856d9de9434d8846ada0d281322e74c72a91
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one heuristic specifically identifying a "PDF link farm". The document body, though heavily obfuscated, suggests a lure related to a "Singer sewing machine user manual". The presence of multiple unknown URLs and the ClamAV detection as "Pdf.Phishing.Trojan" strongly indicate malicious intent, likely to direct users to malicious sites or download further payloads.

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=singer+sewing+machine+user+manual PDF link annotation
    • https://forajezar.weebly.com/uploads/1/3/4/1/134108615/kixasomaj.pdfIn PDF document text
    • https://lisobigu.weebly.com/uploads/1/3/1/6/131606175/rilobu_xugofiteku.pdfIn PDF document text
    • https://site-1177005.mozfiles.com/files/1177005/muwudapa.pdfIn PDF document text
    • https://narefipikabisip.weebly.com/uploads/1/3/2/6/132682930/fafafupenolav.pdfIn PDF document text
    • https://vuvonuzomuvi.weebly.com/uploads/1/3/4/5/134508102/vujabuzafar.pdfIn PDF document text
    • https://site-1176351.mozfiles.com/files/1176351/pavumegiwapimafimiguse.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418565/normal_5fcd68ec5864e.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/batoragubukepo/caroline_myss.pdfIn PDF document text
    • https://s3.amazonaws.com/rixevozajixezos/avd_manager_not_visible_in_android_studio.pdfIn PDF document text
    • https://s3.amazonaws.com/xapijifas/christian_christmas_tamil_songs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/gedimuta/appcompat_v7._jar_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jotizifime/ketogenic_diet_recipe_book.pdfIn PDF document text
    • https://s3.amazonaws.com/gizonukorad/68736354405.pdfIn PDF document text
    • https://s3.amazonaws.com/fukepez/spinal_tuberculosis.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_off0001149e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1149E 5408 bytes
SHA-256: a3b49a49c1df9e075ba7f73a8d10b3b50b0a077069efdbe91865c2e85fffa2f8
font_01_sfnt_off000126e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E8 11032 bytes
SHA-256: 06231a218cbae752548000b667dafa3fbdc4ee126cc147830982fd41b39eae95

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