Malicious PDF — malware analysis report

Static analysis result for SHA-256 9225c40386b9e291…

MALICIOUS

PDF

79.7 KB Created: 2021-02-20 18:17:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 26bb359908e167704557bd75d879c4c0 SHA-1: fb67b237e519e0d38b9358fd9b48f13f4ed5f86b SHA-256: 9225c40386b9e2911bbeb924054844a37cdb36dceedb44512f22b85b265a6b2a
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. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The document body is heavily obfuscated, but the presence of external URIs and the PDF_SEO_LINK_FARM heuristic indicate a malicious intent to redirect users. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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://leonvi.ru/aws?utm_term=used+edenpure+heaters+for+sale PDF link annotation
    • https://supenavasude.weebly.com/uploads/1/3/5/3/135397397/pojawidesojatav-bujugezaw-pememuxe.pdfIn PDF document text
    • https://cdn.sqhk.co/dukapudubi/IihigSW/gubexatobu.pdfIn PDF document text
    • https://cdn.sqhk.co/vikoparif/Yoajghh/live_price_of_silver_aud.pdfIn PDF document text
    • https://cdn.sqhk.co/badexejos/A4haZhi/xojuxewejepezi.pdfIn PDF document text
    • http://bunnygummy.ru/186715047271g2ci.pdfIn PDF document text
    • http://itawegan.space/6834477096199lwo.pdfIn PDF document text
    • https://cdn.sqhk.co/suxujaba/ijYhenC/best_status_2020_apk_download.pdfIn PDF document text
    • http://tehnotop.store/duxuwokkb2m1.pdfIn PDF document text
    • https://latewumopinigan.weebly.com/uploads/1/3/4/3/134313498/cebd6f.pdfIn PDF document text
    • http://all-gopro.com/451077978195iiss.pdfIn PDF document text
    • https://kagesurofuzesik.weebly.com/uploads/1/3/5/3/135303772/nokobodutofisul.pdfIn PDF document text
    • https://cdn.sqhk.co/vaxarogajib/rjhWPW4/85711306499.pdfIn PDF document text
    • https://cdn.sqhk.co/bipobulif/2wdsuie/penoluloxusazezajixapige.pdfIn PDF document text
    • https://gilemana.weebly.com/uploads/1/3/5/3/135319463/d140749882a97a8.pdfIn PDF document text
    • https://dakewamegiru.weebly.com/uploads/1/3/5/3/135305658/debipubuguxu-teviju-roruxube-firidavumejozup.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://talakukatutevib.epizy.com/what_is_the_current_kindle_fire_software_version.pdfIn PDF document text
    • http://xafegewoweli.epizy.com/46299768992.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF1 4956 bytes
SHA-256: a331ea8d92ecf5c886cfd2d0b0db59d291bc9c3b81984f23f7bb89f527685852
font_01_sfnt_off000100ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BA 10224 bytes
SHA-256: 621ec98802ac50e2eb667dae239b17e2a38acf80d3e88c14e660685336122dd6
font_02_sfnt_off0001238c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1238C 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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