Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6ce77bb15190aea…

MALICIOUS

PDF

80.0 KB Created: 2021-03-23 04:05:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c08315967fe5f5330f50194a34fff05c SHA-1: bb79781abec3bd99bff30c7339d34ff4a4e145b2 SHA-256: a6ce77bb15190aea4297e4bea1e492db988b3d591da8235e375bc3518893152d
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, indicative of a link farm or redirection scheme, and is flagged by ML classifiers and ClamAV as malicious. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests the document may be part of a multi-stage attack, potentially using a password to obscure a payload. While no scripts were explicitly extracted, the PDF structure and extensive external links point towards a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://dafemum.ru/aws?utm_term=iso+27001+password+management+policy
    • https://zemapefim.weebly.com/uploads/1/3/4/4/134485651/belenivumum.pdf
    • http://dimozakebaba.scienceontheweb.net/66255318477.pdf
    • http://pestore.pro/sebosupodiwepexexe9blqv.pdf
    • http://in-step.shop/91910415035agt92.pdf
    • https://cdn-cms.f-static.net/uploads/4427274/normal_602481c3a6c48.pdf
    • https://cdn.sqhk.co/gagowuname/Hge9ih9/fast_driftstalle_i_sverige_eller_inte.pdf
    • https://cdn.sqhk.co/wemorapi/lIuhjb2/93438588456.pdf
    • https://dotowukigirer.weebly.com/uploads/1/3/1/1/131163902/moxidutiwam-divikiwojanaf-kubemuwoduzu.pdf
    • https://cdn.sqhk.co/gobajejuz/3ghE1kB/86582936457.pdf
    • https://cdn-cms.f-static.net/uploads/4480173/normal_6033ee152f882.pdf
    • https://cdn.sqhk.co/tibakekavero/hZm0Tgh/sapuvezenivofalojakunu.pdf
    • https://nigukaxo.weebly.com/uploads/1/3/1/4/131453065/zarajigo_sujeduxu.pdf
    • http://ttttrrrr.space/webegur4n381.pdf
    • https://bonesinidojesu.weebly.com/uploads/1/3/4/5/134591006/sobisirixigodilow.pdf
    • https://rusokupos.weebly.com/uploads/1/3/4/4/134468665/zedanalazazol_sivimusekija_bowikudogolonir.pdf
    • https://nifudosuv.weebly.com/uploads/1/3/4/0/134040563/mugik-lurexezofo-vagorewa.pdf
    • https://cdn.sqhk.co/zopimoforaja/cii4Hgf/5028710571.pdf
    • https://zimemomikinipex.weebly.com/uploads/1/3/5/3/135347479/reluvaworovok_fexujudotor_ketesagoriwi.pdf
    • https://xirejefeju.weebly.com/uploads/1/3/4/7/134723985/rurisivuda.pdf
    • https://static.s123-cdn-static.com/uploads/4484376/normal_5fde65e5c3c72.pdf
    • https://rezezeveg.weebly.com/uploads/1/3/1/8/131871466/jebejirosegebo_kemugoxo_nopamenudom_gabuxawak.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://pidusagi.atwebpages.com/58364218384.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f938.bin
47e326b4f9cb569b6dfc01180c2bc8a72939fe2364131e7b07985197833a8191		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF938 5928 bytes
font_01_sfnt_off00010d7a.bin
9d807f65a8d3d8204c32d8d2384976487988c8a00fbfccf7434db21491b09d0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7A 10796 bytes

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