Malicious PDF — malware analysis report

Static analysis result for SHA-256 65fa9141c151734b…

MALICIOUS

PDF

74.2 KB Created: 2021-02-26 01:41:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 2e6a14ffaa0053cd0486a4c64019990e SHA-1: fce723b7c992b5fc949a45f16632e29d1d18e6ec SHA-256: 65fa9141c151734bcdc56fe8b8fa64221f7990062121826bdd9be28e3befd206
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection, indicating malicious intent. It contains numerous embedded URLs pointing to disposable hosting and link farms, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, appears to be a lure related to a 'Cummins qsl9 service manual pdf'. No scripts were extracted, but the presence of external URIs and the link farm heuristic strongly suggest the document is designed to redirect users to malicious 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 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://jacksth.ru/wix?keyword=cummins+qsl9+service+manual+pdf PDF link annotation
    • https://tobalewaluwe.weebly.com/uploads/1/3/4/4/134437424/5325485.pdfIn PDF document text
    • http://zujonatuvetivux.iblogger.org/angular_form_reset_valuechanges.pdfIn PDF document text
    • https://waperimawomexav.weebly.com/uploads/1/3/4/7/134733778/xidexaf.pdfIn PDF document text
    • https://josuriwomevopi.weebly.com/uploads/1/3/4/7/134769094/xobudisuxidiriwobig.pdfIn PDF document text
    • http://katowad.22web.org/ruwegatarogogonutaxino.pdfIn PDF document text
    • http://shoop-fo.ru/amped_wireless_setup_guide_sr10000x8ezr.pdfIn PDF document text
    • http://jaralet.getenjoyment.net/87653591718.pdfIn PDF document text
    • http://jorowijedo.mywebcommunity.org/85215702531.pdfIn PDF document text
    • http://hookup153.space/97336148584ik77e.pdfIn PDF document text
    • http://rosutob.getenjoyment.net/los_renglones_torcidos_de_dios_gratis.pdfIn PDF document text
    • http://form-lnstagramcopyrightservice.com/lagu_aye_123_mayeska4h8gf.pdfIn PDF document text
    • http://sevagawos.getenjoyment.net/tazukumumerezezirafazote.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/lososimap/wikujowumavimivurusijoviz.pdfIn PDF document text
    • https://s3.amazonaws.com/rojalexipokadaz/91811394609.pdfIn PDF document text
    • http://zejibanunepi.myartsonline.com/how_did_the_amnesty_act_of_1872_influence_reconstruction_brainly.pdfIn PDF document text
    • http://wotidupodugi.myartsonline.com/nururogirotu.pdfIn PDF document text
    • https://s3.amazonaws.com/verirejon/cosine_rule_differentiated_worksheet.pdfIn PDF document text
    • http://wenares.myartsonline.com/14063982117.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_off0000e661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE661 5548 bytes
SHA-256: dd7c1631531743b6e3531621caed8fb8a70ba92c4692704d76fbb20479c5da7c
font_01_sfnt_off0000f92f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92F 10016 bytes
SHA-256: 23a4b0aeb315c64d28fe908a9592b2fe47c3d62c981d83076a53c22687328e65

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