Malicious PDF — malware analysis report

Static analysis result for SHA-256 db6f2c57a1dd0c4a…

MALICIOUS

PDF

90.4 KB Created: 2021-03-27 18:39:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 605c6b2b1d3a9182eee2b60181a7a1a7 SHA-1: 9f6530f8d6991d792b3c31cc8f16f32c07c314c7 SHA-256: db6f2c57a1dd0c4aac21f1c59c71fe4b62a434d070a82744628e34e475da2db3
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/award?keyword=life+cycle+of+plasmodium+pdf PDF link annotation
    • http://wepisoja.mypressonline.com/51852037543.pdfIn PDF document text
    • https://xadamunakufadi.weebly.com/uploads/1/3/3/9/133986396/guwekanozizufabi.pdfIn PDF document text
    • https://lafazomutege.weebly.com/uploads/1/3/0/7/130740298/13e17.pdfIn PDF document text
    • https://nevedaroxizewav.weebly.com/uploads/1/3/4/5/134592578/wajusubi.pdfIn PDF document text
    • https://tajafakedebufu.weebly.com/uploads/1/3/1/4/131438499/toxosam_muzilew_xejerubogur_devewepofom.pdfIn PDF document text
    • http://xijipeva.mypressonline.com/velex.pdfIn PDF document text
    • https://bokakarepexopo.weebly.com/uploads/1/3/4/7/134750167/vagurisip.pdfIn PDF document text
    • http://jalatuxu.iblogger.org/bamosad.pdfIn PDF document text
    • https://zuripuwa.weebly.com/uploads/1/3/2/7/132740693/vesod-furebow-bibawobop-daroravu.pdfIn PDF document text
    • https://cdn.sqhk.co/vitimosugu/ayJMhi5/16080353085.pdfIn PDF document text
    • https://lasasozizo.weebly.com/uploads/1/3/4/0/134041343/601bbba7a93a.pdfIn PDF document text
    • https://cdn.sqhk.co/mewobonovagi/jhggibm/xopitajebazavigil.pdfIn PDF document text
    • https://cdn.sqhk.co/tikisudolo/WOWK6jh/ufc_results_fight_night_158.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://17851959-1482-4b49-8222-7b7b0c628459.filesusr.com/ugd/3cb679_292ddf0c4ded45f280aff9d9ee47ee84.pdf?index=trueIn PDF document text
    • https://2cc3dcad-61c1-4442-8662-ca5be7cd8672.filesusr.com/ugd/71b93f_f8c3942234d34d73b0b74b696e3247f8.pdf?index=trueIn PDF document text
    • http://fajopalexidu.rf.gd/nolax.pdfIn PDF document text
    • http://sokatesexoli.epizy.com/lodge_cast_iron_recipes_cornbread.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_off00012608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12608 5248 bytes
SHA-256: d1d5e1c93bdb260a5770a607560e4d376a70378eb831aa3ee5f6c6ed2be4106b
font_01_sfnt_off000137e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137E8 10948 bytes
SHA-256: 983593ba77d4be2bef35b2c458357866afc8dfc8338ca177ffb10ebf3181788e

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