Malicious PDF — malware analysis report

Static analysis result for SHA-256 c680706a190164e9…

MALICIOUS

PDF

79.2 KB Created: 2021-06-08 23:58:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 43c43066c119755c5f16c2cb26a73ba5 SHA-1: cea0ca04613d6fdfcfa2b502a3aa5f6473a7f2af SHA-256: c680706a190164e9d3f4943f3c9128c3aa16d11ad627ea7b0c88368d0f716afe
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with a primary one pointing to 'crewmak.ru', suggesting it acts as a lure to a phishing or malware distribution site. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by identifying the PDF as a link farm on disposable hosting, designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://crewmak.ru/pbw?utm_term=periodic+table+of+elements+with+ion+charges+pdf PDF link annotation
    • https://gikowotezura.weebly.com/uploads/1/3/4/4/134493608/tuvenorob-nerilusaxuz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370056/normal_5fd86914e2ff4.pdfIn PDF document text
    • https://zagefejov.weebly.com/uploads/1/3/2/7/132710748/gitofale-kufemimab-zejapuzaxebele-lojolemonokana.pdfIn PDF document text
    • https://jokikisiva.weebly.com/uploads/1/3/0/8/130873994/2260352.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392441/normal_605dc0164fabd.pdfIn PDF document text
    • https://kosukanawator.weebly.com/uploads/1/3/5/3/135304621/tezexeg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411250/normal_5fe0d1879838c.pdfIn PDF document text
    • https://gorixiboxizamo.weebly.com/uploads/1/3/4/5/134589430/rusukamanila.pdfIn PDF document text
    • https://tosofeguwus.weebly.com/uploads/1/3/4/3/134321705/4523420.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495034/normal_600c747e8e0d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408475/normal_60695c00e0be1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493209/normal_5fdf98fabbc86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421944/normal_6026260065d50.pdfIn PDF document text
    • https://repiwolaz.weebly.com/uploads/1/3/1/3/131381539/016c852f.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
    • https://uploads.strikinglycdn.com/files/09bbd438-a166-478b-b711-c5b6800449f7/melodimofadubilis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39d95827-dffa-4229-9e37-e286b48a4dd3/87460342522.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_off0000e814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE814 5588 bytes
SHA-256: 67da29ac0377ca03c137860c5a18eccf76feed4181f19ee7b201ccc8e171f7c7
font_01_sfnt_off0000faef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEF 10628 bytes
SHA-256: beaacbd78458c2d98a2bc313dd41af719520e1150f966d6b2ef33d759eccbfbd
font_02_sfnt_off00011f1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F1E 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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