Malicious PDF — malware analysis report

Static analysis result for SHA-256 1872c9bdca1825a3…

MALICIOUS

PDF

74.4 KB Created: 2021-01-25 18:43:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: d3c3f8bfe63157561dcac9720e2e7e7b SHA-1: e74d3b97ac570da8c81381ab33d643d9c3c9c80e SHA-256: 1872c9bdca1825a38983258c8e595e525469c2eb8556c0129465349ac01df1dc
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to disposable domains and one specifically identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful content.

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://seumenha.ru/123?utm_term=maine+basketball+hall+of+fame PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4402932/normal_5fd76d621beee.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496014/normal_6005f8487244f.pdfIn PDF document text
    • http://vwwv-avito.online/4287836069dg88z.pdfIn PDF document text
    • http://kamaz-ftc.com/organizer_day_by_day_2020tvyp1.pdfIn PDF document text
    • http://arenda-comp.space/mezovutijibaro1b2fu.pdfIn PDF document text
    • https://dugeditukuvil.weebly.com/uploads/1/3/4/7/134723955/1733502.pdfIn PDF document text
    • http://fesupopimos.66ghz.com/67037488711.pdfIn PDF document text
    • http://tijijosopake.22web.org/nc_escheats_reporting.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468289/normal_5ff21c8f6de9d.pdfIn PDF document text
    • http://rp-youtube.fun/51071448246q6isf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454048/normal_5fee12709e465.pdfIn PDF document text
    • http://procripton.com/67299676254is59i.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dogamesesokuj.rf.gd/zexipudarorat.pdfIn PDF document text
    • https://s3.amazonaws.com/petikamov/8881672868.pdfIn PDF document text
    • https://s3.amazonaws.com/jajoxulabojaso/legubuwifotibuli.pdfIn PDF document text
    • http://nepanazunisemi.epizy.com/lozatewavulejelu.pdfIn PDF document text
    • https://s3.amazonaws.com/tokit/12342537238.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_off0000e92d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92D 5120 bytes
SHA-256: 948b9d0d1a9371f0fceb1e825b9862e9c66516ad291a6daf5ebccd53d6665e97
font_01_sfnt_off0000fa86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA86 9972 bytes
SHA-256: 6342db52e8f91d0ede3944231d86777d660b1c4dd5d655ef2c4731c22c5badc9

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