Malicious PDF — malware analysis report

Static analysis result for SHA-256 88f3b6d6bd3a7984…

MALICIOUS

PDF

76.3 KB Created: 2021-02-25 04:58:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3ea91f8711c67d145f7c98895bfdb01f SHA-1: 6f5f4557086c5c66d9d390e90d75337427c10bb9 SHA-256: 88f3b6d6bd3a7984b68c11ad1fbacb319a7389f9685529feb2e894ba65f77b9f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with many pointing to disposable domains and exhibiting link farm characteristics, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://druttle.ru/123?utm_term=how+to+find+interior+angle+sum+of+a+polygon PDF link annotation
    • https://cdn.sqhk.co/jimumakevaji/bhTKqhe/25811438704.pdfIn PDF document text
    • http://lnstagramcopyrightmanagement.com/sound_of_silence_pentatonix_satb97dnk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376874/normal_5fdbda1856156.pdfIn PDF document text
    • https://cdn.sqhk.co/fugovigul/XythjBv/tepiwuvaterewewo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456114/normal_5ff7b1a195aa8.pdfIn PDF document text
    • http://hotloveme.online/37697939160cyoxc.pdfIn PDF document text
    • http://kopuvimu.scienceontheweb.net/pubidonobutamifaki.pdfIn PDF document text
    • https://luragelekow.weebly.com/uploads/1/3/4/3/134377287/xifosamubova.pdfIn PDF document text
    • http://noverst.xyz/abel_font_ttfwg6xq.pdfIn PDF document text
    • http://mantenancie.com/pevoxamovotemajrijj8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401711/normal_5fed6e439129e.pdfIn PDF document text
    • https://jufavufopu.weebly.com/uploads/1/3/4/3/134340263/vasidex_xufejumegapowaz_dusenoverazib_zuseduvus.pdfIn PDF document text
    • https://faruroju.weebly.com/uploads/1/3/5/9/135986438/f335b3c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tafiwepamubov.atwebpages.com/evenflo_triumph_lx_vs_symphony_dlx.pdfIn PDF document text
    • http://kosezofejesuxef.atwebpages.com/dexixik.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_off0000ea43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA43 5516 bytes
SHA-256: eb14ff020967eeaae035d1d5c594581464281be69b2d230c3f9db2e587b95309
font_01_sfnt_off0000fd0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0D 11384 bytes
SHA-256: 34afd999abf83f81a8cde8436bd2c523a1710051a6ca0fc539342aedc55a347f

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