Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7fc8d44df6faff2…

MALICIOUS

PDF

66.7 KB Created: 2020-11-13 08:37:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: ef3572a9b7e6291611ef0a0f7eafcab1 SHA-1: d1d916520a9a04882490d39eecd4c738e018c2a7 SHA-256: b7fc8d44df6faff2e18f43f72bb2621d725e1cdadddd03df4bccfedef7ca0735
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, with one pointing to 'trafffe.ru', suggesting it's part of a link farm designed to redirect users to potentially harmful content. The presence of embedded URLs and the nature of the heuristics suggest this PDF is used as a lure to drive traffic to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://trafffe.ru/aws?utm_term=gift+box+template+free+vector PDF link annotation
    • https://tibiwurab.weebly.com/uploads/1/3/2/6/132695994/radorudezipaxorobewe.pdfIn PDF document text
    • https://rikisuluwujufa.weebly.com/uploads/1/3/1/4/131452938/9746435.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444378/normal_5fa1ba02507db.pdfIn PDF document text
    • https://fufivivol.weebly.com/uploads/1/3/0/8/130873849/rojezodununetizemap.pdfIn PDF document text
    • https://gusumadanu.weebly.com/uploads/1/3/2/6/132695601/5282713.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449775/normal_5f9f23e032d2b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393349/normal_5f908f25122c2.pdfIn PDF document text
    • https://kavixonew.weebly.com/uploads/1/3/4/5/134592395/jibijazijomavok_xefinowodejol_vakewi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403531/normal_5fa92f931ee86.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/3029889.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/belopudevuzuza/hypertension_treatment.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8d242eb-2d8a-425a-a9fe-e2c796fcff43/82916708883.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5956b14c-ca7a-4eee-a964-8296028f378e/lewid.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/ascaris_suum_life_cycle.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_off0000c599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC599 5284 bytes
SHA-256: d71d32031cf777e37e70494377aff261c0d6a191cbe7bbd3ba98974860668e99
font_01_sfnt_off0000d787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD787 11720 bytes
SHA-256: a33e9fdf98a112230a93610af55683e0dfa91ce8632280798d268a4101c60a62

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