Malicious PDF — malware analysis report

Static analysis result for SHA-256 571df3c96b299345…

MALICIOUS

PDF

68.7 KB Created: 2021-01-06 19:33:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 1916a2dd1473daf88a97c11d3b02fb55 SHA-1: f3dad735e4d074987449aa1777dfdc6c095e5906 SHA-256: 571df3c96b2993458e0c8b49a54e4039d873892290ac96577b6d11dc46a706b3
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many of which are hosted on disposable domains, indicating a link farm designed to redirect users. The primary lure appears to be 'Adobe After Effects for free', suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://traffnew.ru/aws?utm_term=adobe+after+effects++for+free PDF link annotation
    • https://judemozosuduj.weebly.com/uploads/1/3/4/3/134306717/eacd435e7018.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451555/normal_5ff0049cdcc62.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475734/normal_5fa9baec7c423.pdfIn PDF document text
    • https://tazuwadafif.weebly.com/uploads/1/3/4/8/134857375/rokanakafipogim.pdfIn PDF document text
    • https://koxoganonigowup.weebly.com/uploads/1/3/1/4/131408343/801ac33.pdfIn PDF document text
    • https://domuvajedoxu.weebly.com/uploads/1/3/4/8/134847007/e860a9c7edcfd.pdfIn PDF document text
    • https://sixisamut.weebly.com/uploads/1/3/5/3/135308299/c5b453900.pdfIn PDF document text
    • https://voganesabif.weebly.com/uploads/1/3/1/1/131163538/nomawe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3394647-c17a-40f3-9012-3933d8a0dd06/soxigomeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf02222d-b554-46fe-a356-913998528de6/47065265304.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_off0000d178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD178 5112 bytes
SHA-256: 7b690d7a14a66ba6d2d09362de755d6711b3a8a31c7a5db6ed695e32388d3874
font_01_sfnt_off0000e2f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F0 10412 bytes
SHA-256: 780a43cc3fa28301e18ae954ed2fd5da48a72cb6bebc86a1a15b584bb844e48a

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