Malicious PDF — malware analysis report

Static analysis result for SHA-256 1eab48f1ee6a3c8b…

MALICIOUS

PDF

79.1 KB Created: 2021-04-17 13:15:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: ce3b362b12758de286891b1f887f396d SHA-1: ec5b7212b782013f5845d5703669069e40f149a5 SHA-256: 1eab48f1ee6a3c8b6b690b0404667235bbe633b5203cc423ca09f13ca782c0e7
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm, with many pointing to disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or SEO spam. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful content.

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://druttle.ru/strik?utm_term=how+energy+is+passed+through+an+ecosystem PDF link annotation
    • https://cdn.sqhk.co/wamedexipun/gifiebE/42946554759.pdfIn PDF document text
    • https://cdn.sqhk.co/lagidexetin/iisgjii/mudiwu.pdfIn PDF document text
    • http://vopukisavenif.medianewsonline.com/rebujobafuzogabo.pdfIn PDF document text
    • http://rejudatawenu.iblogger.org/20566830342.pdfIn PDF document text
    • https://cdn.sqhk.co/guzowozuk/gfJVxii/16354907201.pdfIn PDF document text
    • https://cdn.sqhk.co/sesedazaw/hdKOjgA/banana_blast_game_instructions.pdfIn PDF document text
    • https://cdn.sqhk.co/mawejoxejobe/kjhDjgI/bandpass_filter_matlab_audio.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405420/normal_60545328658a9.pdfIn PDF document text
    • https://cdn.sqhk.co/jukowejazus/Hsjaihc/xazafuzawinofewupatoxepat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492901/normal_60690de2ed4b8.pdfIn PDF document text
    • https://cdn.sqhk.co/vibebexez/jghjie3/voxofunajevalon.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwusemob/CtgeAkE/xujugu.pdfIn PDF document text
    • https://cdn.sqhk.co/batumozi/dxeheia/butajixad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://titugol.atwebpages.com/research_on_problem_solving_in_mathematics.pdfIn PDF document text
    • https://acfcda0b-1795-4b40-aedc-9a0bc13047ce.filesusr.com/ugd/89c6ad_71ad96f2cd944caf97b1e44121d7bb28.pdf?index=trueIn PDF document text
    • https://f405dec1-7f90-4f4c-a861-5286f67d0127.filesusr.com/ugd/ab922d_727e70c223144ab3a143b7fe6834e26e.pdf?index=trueIn PDF document text
    • http://pagupim.epizy.com/jegililumepodomesapi.pdfIn PDF document text
    • http://vifudirowu.rf.gd/bully_math_3_all_answers.pdfIn PDF document text
    • https://411be8f8-4ba1-40b5-9edf-cc4a2c3d5ecc.filesusr.com/ugd/a86d68_d12153853f7142f49778f25a45360b42.pdf?index=trueIn PDF document text
    • https://9526c93a-d340-4dca-b5fd-2864ff0888c4.filesusr.com/ugd/4c3d6a_03af5f40858046a0aaecd0e0d014dc82.pdf?index=trueIn 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_off0000f6a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A6 5608 bytes
SHA-256: 6c79fe09014222770e6c572590598db27aba80f1e47d9114693985b8438dc126
font_01_sfnt_off000109af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109AF 11004 bytes
SHA-256: 80928ebf53bfbb47b69d11e9270e259e6e089d97b94a56c6901e9528c901f2d1

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