Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cf5341603de09fa…

MALICIOUS

PDF

93.9 KB Created: 2021-02-26 14:06:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 46c5557e0bf9e0c7f3c1c8d4f4065a01 SHA-1: 9a0695cb626e9fae6e350a75904610eaf149862e SHA-256: 1cf5341603de09fa9cd241b7c3e97a316018d3961ef5cd6e6938563a90f9eaa9
186 Risk Score

Malware Insights

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

This PDF file was identified 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 a link farm or SEO manipulation tactic. The embedded URLs are likely used to redirect users to phishing sites or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jacksth.ru/strik?utm_term=sql+tutorial+for+beginners+edureka PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4478952/normal_5ffa7b1ad6550.pdfIn PDF document text
    • https://guwixuwekolarap.weebly.com/uploads/1/3/2/7/132740580/ravapurudigax.pdfIn PDF document text
    • https://wivexisi.weebly.com/uploads/1/3/1/0/131070498/178374.pdfIn PDF document text
    • https://xerupirep.weebly.com/uploads/1/3/1/4/131408033/tibisa_biroxame_pogukerok_gutifefiri.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494883/normal_6016059e1207f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481275/normal_5ff2b9764397f.pdfIn PDF document text
    • https://femezusuf.weebly.com/uploads/1/3/1/6/131606597/3185641.pdfIn PDF document text
    • http://makamar.online/7413852189287buu.pdfIn PDF document text
    • https://valuluxunu.weebly.com/uploads/1/3/2/7/132710491/jajibupabofutajigob.pdfIn PDF document text
    • https://kugibunil.weebly.com/uploads/1/3/1/4/131437599/dadab.pdfIn PDF document text
    • http://13millions.store/30950958281u3m80.pdfIn PDF document text
    • http://copyrights-notices-helps.com/nobuvadirojowerezubob9ph4.pdfIn PDF document text
    • http://wordsidepost.top/webuwilidebipironizawajofuh7sg.pdfIn PDF document text
    • https://lonokowikur.weebly.com/uploads/1/3/5/3/135384913/nutozixix.pdfIn PDF document text
    • http://c-advance.space/112584308613ull1.pdfIn PDF document text
    • http://milanbeach.fun/le_bateau_de_monsieur_zouglouglou_personnagesw258j.pdfIn PDF document text
    • https://xutativapejan.weebly.com/uploads/1/3/4/5/134521393/5c36fe96.pdfIn PDF document text
    • https://fafefojesuvun.weebly.com/uploads/1/3/4/6/134651362/a8c60aead50.pdfIn PDF document text
    • http://busforpay.online/joe_torres_hey_dudepo5mc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010ec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC5 5508 bytes
SHA-256: ceeb0435a70a82c7680ba354ff5bee9dfc2b38d60079e32a5d97d975c546f5ee
font_01_sfnt_off00012177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12177 2760 bytes
SHA-256: bd354c6f8c0723c88ef9435c011621be29e2b47cc7cba6b2030e3420683e74c4
font_02_sfnt_off00012cc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CC9 11520 bytes
SHA-256: 1cf6503bac16766b750bd5b10ed9218bece904f70331d70f8554d96ba1027eb1
font_03_sfnt_off0001544f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1544F 16204 bytes
SHA-256: c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449