Malicious PDF — malware analysis report

Static analysis result for SHA-256 d040db8c6b5d877e…

MALICIOUS

PDF

76.9 KB Created: 2021-05-13 16:36:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ad79e97066df76f4c0ee0a38d19837fe SHA-1: 3ce6ef1be011c7a2a4b30a08b91888eaf3572e65 SHA-256: d040db8c6b5d877ee7c1b173924941f376a135e34b62e3a37f2d18fabcc79403
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 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/strik?utm_term=what+are+the+odds+of+quantum+tunneling PDF link annotation
    • http://sdorovie-sustavi.xyz/black_and_decker_iron_tempqnx0g.pdfIn PDF document text
    • http://fortuneo.biz/66380525536ecjah.pdfIn PDF document text
    • http://busforpay.online/gonigoge74kgy.pdfIn PDF document text
    • https://kalujobad.weebly.com/uploads/1/3/4/3/134390175/dutumumom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500677/normal_60373d1c44f50.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383304/normal_5fc5e7034d7e5.pdfIn PDF document text
    • http://tevfikyuce.xyz/folovujirh0qq.pdfIn PDF document text
    • https://toruganaduloxo.weebly.com/uploads/1/3/5/3/135347606/vadevarekasezalapi.pdfIn PDF document text
    • https://xagajopudulu.weebly.com/uploads/1/3/4/6/134697977/28f0a9d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405674/normal_6016762c472d4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454184/normal_60070da0bd6eb.pdfIn PDF document text
    • http://euromarket.pro/14344583599x5t33.pdfIn PDF document text
    • https://dudobafileziv.weebly.com/uploads/1/3/5/3/135331993/jetexeto_gilor.pdfIn PDF document text
    • http://belkwigs.com/811091736456p3dj.pdfIn PDF document text
    • http://brosbass.com/19476627147c0ca8.pdfIn PDF document text
    • http://fibaxoxadomi.sportsontheweb.net/capoeira_songs.pdfIn PDF document text
    • http://czecheducation.space/50588774346rfrey.pdfIn PDF document text
    • http://leledup.mypressonline.com/askep_anemia_defisiensi_besi.pdfIn PDF document text
    • https://vemulasi.weebly.com/uploads/1/3/4/5/134509822/dujuvepime_tagaxegukuwu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gudukiderunusu.myartsonline.com/farmacologia_de_autacoides.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_off0000eae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE5 5460 bytes
SHA-256: 955a6dbc3b2d35acc28978cc9664fc2d5da57e57cb14cf91fba334007614b6db
font_01_sfnt_off0000fd50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD50 12116 bytes
SHA-256: 4138d2227d94ff08dfd27a59b33e21a357a0c59baa9f4539f67c72012fae5175

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