Malicious PDF — malware analysis report

Static analysis result for SHA-256 5400902a057d2192…

MALICIOUS

PDF

79.8 KB Created: 2021-02-19 08:13:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 11ab9dfe2ad1f66bd510f0715e35ea7f SHA-1: 183dd763141ff9fed17b2f8f9735e934a2d23f3c SHA-256: 5400902a057d2192fbee542dbffa1fb76570fcc096fdcc65c997ba9cc765e5a7
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, indicative of a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://baarspo.ru/aws?utm_term=material+science+and+engineering+callister+solutions+manual+9th PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368978/normal_5fd7e63ac5b74.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471691/normal_5fe43472f2e3a.pdfIn PDF document text
    • https://xerazagas.weebly.com/uploads/1/3/0/8/130813913/2873078.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450727/normal_601101d58bc26.pdfIn PDF document text
    • https://vubenazago.weebly.com/uploads/1/3/4/3/134357699/liviwikepoder.pdfIn PDF document text
    • https://mozawexi.weebly.com/uploads/1/3/1/8/131856146/fdb893b4c3.pdfIn PDF document text
    • https://woveguzusozor.weebly.com/uploads/1/3/1/3/131383383/numilikabages.pdfIn PDF document text
    • https://cdn.sqhk.co/letojeka/iazJiim/download_free_offline_english_dictionary_for_android.pdfIn PDF document text
    • https://cdn.sqhk.co/foroboreb/4LjbUhg/bujutedaridoxofuwabu.pdfIn PDF document text
    • https://xinosete.weebly.com/uploads/1/3/0/9/130968926/6906810.pdfIn PDF document text
    • https://cdn.sqhk.co/lajefage/gsrzDCi/nasa_hoodie_h_m_orange.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://varoniwarovez.rf.gd/fiberglass_cloth_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/zexozavo/dapagamodefobuzogibone.pdfIn PDF document text
    • https://s3.amazonaws.com/suzixegazunow/83763703076.pdfIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/64422109734.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_off0000e089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE089 2196 bytes
SHA-256: 3bc625f4c3ba6568f47142fbf6c7cd70d53bd4a4023a7ec6cbc6da920fc44d29
font_01_sfnt_off0000ea6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6E 5516 bytes
SHA-256: dbd87d3250c998df32d724ed428fab40a4c31104658a2e04e0ce6139d92f63fe
font_02_sfnt_off0000fd06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD06 15816 bytes
SHA-256: 0a490a200852d0ce4b4d8a5587ceff15892a092322590a63c36f059b37f20712

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