Malicious PDF — malware analysis report

Static analysis result for SHA-256 be29fbaf7f5559a8…

MALICIOUS

PDF

63.1 KB Created: 2021-02-15 04:54:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ce903062f05a315affa106ed814218ec SHA-1: 3556ade2f6961be1512874dab04972f78a0ac9be SHA-256: be29fbaf7f5559a874c67f4145b55944130be4da031040f4bfc71f7dd695129c
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://jacksth.ru/wix?keyword=central+angles+and+arc+measures+worksheet+answer+key PDF link annotation
    • https://mifesala.weebly.com/uploads/1/3/2/6/132683173/5549332.pdfIn PDF document text
    • http://daating19.site/historia_de_la_constitucion_de_guatemala_de_1965xn6gk.pdfIn PDF document text
    • http://thepropheticapp.com/bernstein_research_reportuxv58.pdfIn PDF document text
    • http://cashbackmoney.info/let_s_go_planetshakers_lyrics_genius5i0ih.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450260/normal_5fea454e5a275.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461751/normal_5fccf6fb61da0.pdfIn PDF document text
    • https://liwifaxuje.weebly.com/uploads/1/3/0/8/130874244/9124197.pdfIn PDF document text
    • https://batozovij.weebly.com/uploads/1/3/1/4/131455337/3915799.pdfIn PDF document text
    • https://kakenemewaxe.weebly.com/uploads/1/3/4/6/134655752/4247064.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419235/normal_6013352415dfd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bonanelokuweje.rf.gd/24018034092.pdfIn PDF document text
    • http://modudupudabu.rf.gd/6925437277.pdfIn PDF document text
    • http://zumojuluru.epizy.com/26068349718.pdfIn PDF document text
    • http://jiguteduvuvuxa.rf.gd/custom_video_intro_templates_free.pdfIn PDF document text
    • https://s3.amazonaws.com/fonazuzixagizir/piretulavijuvag.pdfIn PDF document text
    • https://s3.amazonaws.com/sitok/company_car_mileage_tracker_spreadsheet.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_off0000ba95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA95 5516 bytes
SHA-256: 38ab251ed8856b30394c066eb80594a019e3aaa0750e035992f97a584a8b7578
font_01_sfnt_off0000cd3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD3B 9936 bytes
SHA-256: c2ec7ea4b317132f845bd035a278cf0fb825f93ae3577deb1c90911e9ab0c81b

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