Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5bd3c12b2e2a4ec…

MALICIOUS

PDF

74.5 KB Created: 2021-02-20 15:52:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 4cf6f4e5277af4bf1e59c86f271a80f4 SHA-1: 10938eabb22636f645c5421d68d9adcd8cd538d1 SHA-256: c5bd3c12b2e2a4ec48b69079092ca4d1c45d1a85dce0b9e611c077e8216eed3f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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 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://baarspo.ru/wix?keyword=black+ops+2+zombies+unblocked+games PDF link annotation
    • https://cdn.sqhk.co/kafexobesa/bChiijB/33807766404.pdfIn PDF document text
    • https://kilixezexixoz.weebly.com/uploads/1/3/1/1/131163494/c81ea3e75.pdfIn PDF document text
    • http://tumerasiwabuzip.22web.org/joxovizuzewivuxunolitixew.pdfIn PDF document text
    • https://raxazejopife.weebly.com/uploads/1/3/5/3/135313527/wuvola.pdfIn PDF document text
    • https://golewobewawir.weebly.com/uploads/1/3/4/3/134350879/9114626.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369903/normal_601ee2870fd14.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404528/normal_5fdfabfa6a4dc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461484/normal_5fc97869a0d40.pdfIn PDF document text
    • http://kiduzat.iblogger.org/timurorezexiwuzamutebeja.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481520/normal_5ff5c12fba04f.pdfIn PDF document text
    • http://ratubave.22web.org/8144562592.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/megelugik/mezibifasut.pdfIn PDF document text
    • http://bumunosusub.epizy.com/40100300731.pdfIn PDF document text
    • https://s3.amazonaws.com/kewuxejikiwe/conjunction_and_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/gekojulog/winiperitixopuxopavifow.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_off0000e573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE573 5732 bytes
SHA-256: b3037e00a93dd9a3fa186160a2378562b300f1ee7ad52c7f22dd6382c3653505
font_01_sfnt_off0000f8ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EF 10412 bytes
SHA-256: 5c7fed91d042ed0e6f0a920d0b8898dfb5024748a088d6d53aec6bb8bbea94df

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