Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a3ca2d21e8f80c6…

MALICIOUS

PDF

79.5 KB Created: 2021-02-17 03:09:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 8a91628b0e09492c1adf05010f84bea3 SHA-1: acb204f91757b782aab8c7e77e24cda24db97d27 SHA-256: 7a3ca2d21e8f80c60db88cf94a69490dfe93de6565a5d8d39b89a58f51264262
126 Risk Score

Malware Insights

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

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

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://jottigo.ru/123?utm_term=rbse+solutions+for+class+12+physics+chapter+11 PDF link annotation
    • http://mojuluxemo.22web.org/35273535131.pdfIn PDF document text
    • http://igme.site/welos6jfdz.pdfIn PDF document text
    • http://nicechange.space/9757723342kdkto.pdfIn PDF document text
    • http://youla-24.cc/weather_worksheets_grade_577rvj.pdfIn PDF document text
    • http://worldworkbook.com/drowsy_maggie_sheet_musicxgeit.pdfIn PDF document text
    • http://reflectionss.space/jupemexokifosilorubidovs52w.pdfIn PDF document text
    • http://sokfresh.fun/3569257820729k54.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421466/normal_5ffe20668c871.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501385/normal_5ffc983b8444b.pdfIn PDF document text
    • https://sasofisapen.weebly.com/uploads/1/3/4/5/134590640/9283624.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423431/normal_5fe0609636211.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392656/normal_601cdb5b07cae.pdfIn PDF document text
    • http://jezoxegodugorol.22web.org/florence_oregon_weather_report.pdfIn PDF document text
    • http://hookup754.fun/66225789525dxnv.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/nitirew/35107464656.pdfIn PDF document text
    • https://s3.amazonaws.com/novipaliwid/felamabazebitigugafe.pdfIn PDF document text
    • https://s3.amazonaws.com/bajuse/20710436038.pdfIn PDF document text
    • https://s3.amazonaws.com/pidufozu/24429328068.pdfIn PDF document text
    • http://pawutewitozi.epizy.com/gasadekil.pdfIn PDF document text
    • http://gekekenam.rf.gd/chicago_bears_injury_report_week_3.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CB 5536 bytes
SHA-256: e40060fc3bcbd4b6668959e927c0afd019f604b988f514b03cdf490336b42c3c
font_01_sfnt_off0000f4a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A8 11360 bytes
SHA-256: 130c2c94706698f2034d5044fa56d191fb184f7c45251dc2581edbc14e0ad13e
font_02_sfnt_off00011ad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD2 16192 bytes
SHA-256: c00f55c8a23f8fc12478e3e4ea1bac713d25e4d1dd6e1e4bb5c667610ba6b2cf

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