Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdb4ce79a0789f06…

MALICIOUS

PDF

76.9 KB Created: 2021-03-15 07:00:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: f49ac2bff3ad12a53c0ab82bb91dc4e1 SHA-1: f86607fdd0bcaa43e94e551a27b9563d3f92b5ce SHA-256: fdb4ce79a0789f062ef080ed95b7c4851d6a6ca3203425f469f89bbd9990099f
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting it functions as a link farm. The presence of embedded URLs and the PDF's structure point towards an attempt to redirect users to potentially malicious or phishing websites, possibly as part of a broader SEO manipulation or phishing campaign.

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://lozipotod.ru/123?utm_term=tyvek+groundsheet+australia PDF link annotation
    • https://nitevugumosu.weebly.com/uploads/1/3/4/5/134526644/fobogise.pdfIn PDF document text
    • http://discount50it.pro/half_of_odd_numbers_worksheetezf0o.pdfIn PDF document text
    • https://bekariniwoxisit.weebly.com/uploads/1/3/2/7/132710774/3ee6d35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449771/normal_60449608777a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453100/normal_6013a17540aa7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366957/normal_60381213143f7.pdfIn PDF document text
    • http://finansi-7.online/5883403518738kka.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466175/normal_6048da5e40c15.pdfIn PDF document text
    • https://diwijavel.weebly.com/uploads/1/3/4/6/134691177/2284421.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404741/normal_5fdd6c9a1a8ac.pdfIn PDF document text
    • https://gerikolobel.weebly.com/uploads/1/3/1/3/131398187/ae793b901.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450038/normal_5ffc0bd29fdcf.pdfIn PDF document text
    • http://ionatr.space/bisopepusoxuferaxonelukip5wm.pdfIn PDF document text
    • http://hopecommunitynaz.com/budugusujenojefufurwskfa.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/wujanozo/badger_500_garbage_disposal_humming.pdfIn PDF document text
    • https://s3.amazonaws.com/nodetuxapabara/how_to_write_a_movie_review_essay_for_college.pdfIn PDF document text
    • https://s3.amazonaws.com/bejenosugede/jenoporunuza.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_off0000ef6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6B 5264 bytes
SHA-256: 2fae9319e4894de3703c8162a8acf5c05b47d91344b0768a2524c0c75292d7e9
font_01_sfnt_off0001015f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015F 10888 bytes
SHA-256: 1e1c924ff78b9859a9a56aec0f4d996e4d2eee8ef165b4b9f6d805f1b4eb271b

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