Malicious PDF — malware analysis report

Static analysis result for SHA-256 9938d619b8fba38c…

MALICIOUS

PDF

73.2 KB Created: 2021-02-22 11:44:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: c79f23f1005bf3e0d45a71270717b36f SHA-1: 86057e8d64ea21e9df2f3353817c3036bb7f198d SHA-256: 9938d619b8fba38c0c697ae6e776f3ec553adb476e80ca0fd8ae57c5de9c0157
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of a malicious document, possibly leveraging embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://maypoin.ru/123?utm_term=singer+pixie+plus+troubleshooting PDF link annotation
    • http://parrrtner.xyz/free_club_flyer_templates_psdfgjww.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376629/normal_5fda59eacd4c2.pdfIn PDF document text
    • https://nujokolove.weebly.com/uploads/1/3/0/8/130874035/9357886.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450046/normal_6012838f1ac5d.pdfIn PDF document text
    • https://vaxokivov.weebly.com/uploads/1/3/1/4/131453734/bimaxapasupa.pdfIn PDF document text
    • http://dfahsdfgjsfg.online/7564569732k34sw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405922/normal_5fda8ec5c1c04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402504/normal_6021948778d50.pdfIn PDF document text
    • http://eduha.online/the_100_season_4_episode_10_wikimhf4g.pdfIn PDF document text
    • http://urro-hu.com/75701279985hsxdi.pdfIn PDF document text
    • http://ourfutures.space/visio_org_chart_template_downloadgwto1.pdfIn PDF document text
    • http://roskycnmx.com/combustion_equations_worksheet_answersp7vuv.pdfIn PDF document text
    • https://xadixolikiz.weebly.com/uploads/1/3/1/3/131380305/365b8d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494452/normal_600c55f81a145.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445320/normal_600b79a4bf6b0.pdfIn PDF document text
    • http://arm-watch3.club/5629834323837dgu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dobesogum/27296951872.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_off0000dfe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE6 5184 bytes
SHA-256: 46260187e204e5d6719e0283afc4f59c0fb93766f9c8bce42f600fd8ba7dd856
font_01_sfnt_off0000f182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF182 10888 bytes
SHA-256: 02b2a067a686e7ddcdf0bac75da5c911ff76f4de7d616021f981a4652da5f1d8

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