Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d86f2a085258dd3…

MALICIOUS

PDF

68.2 KB Created: 2020-12-04 12:52:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ded814a32aea5faff1e74348abac1070 SHA-1: ba2b76465d14d7abbf89d6f4321ffb6c63fbffd1 SHA-256: 1d86f2a085258dd32e49aa1255f6c63acd0b4cbe003825f66e242d55e3abd1f7
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded URLs, with a critical heuristic firing for a link to known malicious redirector infrastructure. Another critical heuristic indicates a link farm, suggesting an attempt to manipulate search engine results or distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cctraff.ru/aws?utm_term=bobol+wifi+via+termux+android
    • https://cdn-cms.f-static.net/uploads/4366341/normal_5f87224b49375.pdf
    • https://cdn-cms.f-static.net/uploads/4368221/normal_5f9d749db2582.pdf
    • https://pojutawetuje.weebly.com/uploads/1/3/1/3/131382470/jokipoje.pdf
    • https://cdn-cms.f-static.net/uploads/4366010/normal_5fb7cc00f4004.pdf
    • https://gibitiwatu.weebly.com/uploads/1/3/0/7/130776060/8576615.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/883b9b77-c64f-48e8-a7a7-0f0736ee7175/emberde_uzunluk_konu_anlatm.pdf
    • https://uploads.strikinglycdn.com/files/748788df-7b52-4b35-ba68-227011bac14e/serakofegizugejem.pdf
    • https://s3.amazonaws.com/wovugi/google_drive_limit_fix.pdf
    • https://s3.amazonaws.com/jefobexapulow/43453745967.pdf
    • https://uploads.strikinglycdn.com/files/b4c53bea-6957-4d91-bfbc-705d88ea7275/zatujolaguroxaromubutu.pdf
    • https://s3.amazonaws.com/somisilegex/gomazaxezefukivuweme.pdf
    • https://uploads.strikinglycdn.com/files/617aa8ba-466c-4b9f-9295-f50a22291b37/poulan_micro_xxv_vintage_chainsaw_service_manual.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_off0000cae0.bin
62d4c5b0b2b5e2dedb7a5055bf1e57a0c400fad89b70b5b20dac7bac852d9311
pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE0 5284 bytes
font_01_sfnt_off0000dce1.bin
cc6a42151f666286b115a7d2a9eca22b75a66af2d6acde05f3f616a93ac7a770
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE1 11740 bytes