Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8e8ed765edac04d…

MALICIOUS

PDF

72.3 KB Created: 2021-02-06 01:32:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: c095aa5ee398461d02bb0266a8ffab22 SHA-1: b9963af82d84a3742dd8b837d98e366ebac370e3 SHA-256: f8e8ed765edac04d7d9106bfdb7ec7d1a12f5fb73d09ec77c06752fbf28b5ba6
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, and is flagged by ClamAV as Pdf.Phishing.Trojan. The ML classifier also strongly indicates maliciousness. While no scripts were extracted, the presence of numerous external URLs suggests an attempt to redirect the user to malicious content, likely phishing or malware distribution 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 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.
  • 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://jacksth.ru/123?utm_term=cuesta+community+college+district PDF link annotation
    • http://rent-nout.site/l_absentisme_au_travail3zai9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451950/normal_6015a0bc27186.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374860/normal_601726735c9f0.pdfIn PDF document text
    • https://cdn.sqhk.co/fuxuduxexi/Lgdjfgf/89922097583.pdfIn PDF document text
    • https://cdn.sqhk.co/mapexovebo/w4geicZ/fowudizutalegataz.pdfIn PDF document text
    • https://cdn.sqhk.co/sifapudoxig/dnjjifD/gevilemifusesago.pdfIn PDF document text
    • https://cdn.sqhk.co/lotazoza/hcgcyIw/us_president_election_2020_update.pdfIn PDF document text
    • https://cdn.sqhk.co/zuxosutuku/ibidoif/texas_tractor_pull_2020_schedule.pdfIn PDF document text
    • https://junurewumopu.weebly.com/uploads/1/3/2/7/132740614/mudored.pdfIn PDF document text
    • https://cdn.sqhk.co/boxokozofe/iiAgeig/7364681795.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410027/normal_6017709c1b3f6.pdfIn PDF document text
    • https://cdn.sqhk.co/kovezozeseg/e5hjhd6/pinball_jones_campus_west_fort_collins_co.pdfIn PDF document text
    • https://tilawifi.weebly.com/uploads/1/3/4/4/134480999/942d640e97cc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388427/normal_5fc9a80fb1adf.pdfIn PDF document text
    • https://cdn.sqhk.co/raninogozo/imKaiie/toca_kitchen_2_free_no_download.pdfIn PDF document text
    • https://zesaxigupube.weebly.com/uploads/1/3/4/0/134016892/686a74ccb.pdfIn PDF document text
    • https://cdn.sqhk.co/jabosuve/cNii8hh/diet_breakfast_smoothie_recipes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000de1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1D 5268 bytes
SHA-256: d0cf908bf5a28c187b4b3c391a448c11a2031f1c816bc931d4b2bf9190b30af0
font_01_sfnt_off0000eff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF3 10672 bytes
SHA-256: 328635fbb534d06c2ee670090d4f704e56e21fef29f2986ec245a95411520985

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