Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fd531ca3bf6ff5f…

MALICIOUS

PDF

62.2 KB Created: 2020-12-19 14:58:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 2cb2981d61b9e1347a7883ce9e2c917d SHA-1: 9e7fa51f31ea783e8bf34535f6c5262b5f42de26 SHA-256: 9fd531ca3bf6ff5f5dd417b58e3bfcc0b29fdd585a4dc08fb720fd8819a58c23
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded URLs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for numerous links, suggesting an attempt to obscure the true malicious destination. While no scripts were explicitly extracted, the presence of embedded URIs and the overall detection profile strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://traffine.ru/strik?utm_term=scharffen+berger+chocolate+maker+solucion PDF link annotation
    • https://fevapeju.weebly.com/uploads/1/3/4/4/134468187/sadavetafigevurola.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446398/normal_5fb93163c9f04.pdfIn PDF document text
    • https://woremudof.weebly.com/uploads/1/3/4/7/134701645/becc9739e25365.pdfIn PDF document text
    • https://lirebuzufosol.weebly.com/uploads/1/3/1/4/131453665/2687f9b2245002f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375196/normal_5fb438be0edca.pdfIn PDF document text
    • https://binenivav.weebly.com/uploads/1/3/4/5/134516867/biwupaweretad-sowusevoni-tafivimefiviki-zagezanif.pdfIn PDF document text
    • https://dilomosef.weebly.com/uploads/1/3/4/3/134316650/230822f53d66.pdfIn PDF document text
    • https://tidemipevu.weebly.com/uploads/1/3/0/7/130740592/2c2a88047.pdfIn PDF document text
    • https://tololomajaju.weebly.com/uploads/1/3/4/4/134472688/3913194.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fdd37885b7bc966055e0d98/t/5fdd724915a11837d0905ff5/1608348233735/angry_shiva_hd_images.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc6c827d32fb7060d0d779b/t/5fc8c8c0217b3604ede4eb93/1606994113837/65437769275.pdfIn PDF document text
    • https://s3.amazonaws.com/xeropizuwe/54999868860.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4102cce4-1068-435e-ae40-1e09d29fad8a/2015_nissan_altima_driver_side_mirror.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/adc224b7-56d6-4f90-ace5-f9d3d479c151/sybil_book_by_flora_rheta_schreiber.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/87544823062.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b72c664-96b0-4789-9082-e4585a3f22f4/vorininodisigoxo.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_off0000b589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB589 5600 bytes
SHA-256: 583ee6c8801284465887b8ee664172a9c5b89ecd28ba96b2f83ae715c907e796
font_01_sfnt_off0000c86d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC86D 10464 bytes
SHA-256: 88a4af840fb90ede230925ebd1a66b0febf6446cee9a5e6fffeca46ffba275fb

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