Malicious PDF — malware analysis report

Static analysis result for SHA-256 2afa89db1a07969b…

MALICIOUS

PDF

82.1 KB Created: 2021-01-13 21:30:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 99c858a95ecd43e601eb64dc4fa1e74b SHA-1: e8c919f30f10d52f25321c7efa635a1de19db9fc SHA-256: 2afa89db1a07969bf6e0cf19ade2bfb8003d89e11ef9e51c47b89683dce47ad3
184 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically indicating it is a redirector to malicious infrastructure. The embedded URLs, such as 'https://gettraff.ru/123?utm_term=japanese+musical+instruments+slideshare', are indicative of phishing or malware distribution attempts. The file's structure and content suggest it is part of a link farm designed to obscure the final destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • 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 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.
  • 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://gettraff.ru/123?utm_term=japanese+musical+instruments+slideshare In PDF document text
    • https://site-1175023.mozfiles.com/files/1175023/xodokepexezu.pdfIn PDF document text
    • https://pawudovavumub.weebly.com/uploads/1/3/1/4/131411600/tusotenenamud.pdfIn PDF document text
    • https://cdn.sqhk.co/zegetaru/gijegc3/sea_battle_2_tips_and_tricks.pdfIn PDF document text
    • https://cdn.sqhk.co/zedazisem/prjgjeo/77652500957.pdfIn PDF document text
    • https://site-1174180.mozfiles.com/files/1174180/94264112963.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444649/normal_5fe0d1f61f56d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459777/normal_5fa1aef3bacb6.pdfIn PDF document text
    • https://site-1224402.mozfiles.com/files/1224402/90508321947.pdfIn PDF document text
    • https://mozufakumijisa.weebly.com/uploads/1/3/5/3/135333945/noverefomifo_pasiter_noloxesexow_zalexefox.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
    • https://s3.amazonaws.com/bitajemisajoz/chrome_latest_filehippo.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_off0000fa11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA11 1636 bytes
SHA-256: 017610d6375b55fa83a2b778971da46bfa2556f9e26f9584b555d06809bb30fe
font_01_sfnt_off0001023e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023E 5300 bytes
SHA-256: 7ed933e1cc237b0f47af78128e5af0a507262e2ce403f207a3923c52a840d4d8
font_02_sfnt_off00011410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11410 11396 bytes
SHA-256: 6b563e5220fc0be734b4848f50be9bcd8e973eeba3f12863023655a5760bee6f

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