Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8f10cb9593c9d8b…

MALICIOUS

PDF

64.6 KB Created: 2021-02-17 17:18:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 2c8d29ed9719f0535623ec724c265b51 SHA-1: 3d0876461127ae410763669b09040a6c705a8df6 SHA-256: b8f10cb9593c9d8be8cdd7dd00086336e278c19b09a559dbc43c888f6ba1681d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are likely used to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using numerous small PDFs hosted on disposable domains for link farming, suggesting a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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=naming+ionic+compounds+worksheet+answer+key+caco3 PDF link annotation
    • http://nout-sale.site/gifole5mclz.pdfIn PDF document text
    • http://modernstyle.pro/mulujuximiminaryl63.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369504/normal_6029246acde30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369324/normal_601f02ee47614.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420476/normal_5fcea5e279f62.pdfIn PDF document text
    • http://ejqy.com/hey_duggee_badgespibj5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471513/normal_602104a4c7bde.pdfIn PDF document text
    • https://cdn.sqhk.co/voxedifi/cnPQghc/wurigiroz.pdfIn PDF document text
    • http://idealica-italiaufficiale.website/bakery_near_me_ice_cream_cake101y8.pdfIn PDF document text
    • https://cdn.sqhk.co/rufomezin/gejcibO/tolisurufep.pdfIn PDF document text
    • https://cdn.sqhk.co/miropefaneka/hfif6ZW/turoxaso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387704/normal_602ae0331f0f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484093/normal_60281651ccdf2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386851/normal_5fe995bc3f079.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367007/normal_601b355c150b3.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/garorowa/stones_throw_s.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_off0000c267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC267 5844 bytes
SHA-256: 7553c401e0983c05f13a787e8ed9bd8711914fe0949820db76d551bb80c853e1
font_01_sfnt_off0000d647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD647 9024 bytes
SHA-256: 3ce3d52dfeaa84cbb39a8e0b287a2a81fdceff8646f2ac30e4a655ca3d9eef53

Open this report in the interactive analyzer, or submit your own file for analysis.