Malicious PDF — malware analysis report

Static analysis result for SHA-256 f748e94c1b389168…

MALICIOUS

PDF

79.3 KB Created: 2021-05-17 00:54:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 7dcb5a951806a323665fa56ef4c3eff9 SHA-1: 7d53051aebe57ecacac988bf152458aa374a837f SHA-256: f748e94c1b38916851ea1c61734e78c449a0ea4e7bffbcdb96f51d74f370718a
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

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://gimoguvi.ru/strik?utm_term=the+gift+of+the+magi+multiple+choice+questions+and+answers PDF link annotation
    • http://duwinijuj.mypressonline.com/78908982467.pdfIn PDF document text
    • http://lezapogogaz.iblogger.org/jubilant_industries_annual_report.pdfIn PDF document text
    • http://geforiro.scienceontheweb.net/bradford_white_warranty.pdfIn PDF document text
    • http://muzesumulel.getenjoyment.net/widotoxidamakomefa.pdfIn PDF document text
    • http://kugaraginoja.mypressonline.com/dojopefi.pdfIn PDF document text
    • http://korefubelexusiz.medianewsonline.com/biochemical_systematics_and_ecology.pdfIn PDF document text
    • http://paxosij.mygamesonline.org/how_to_write_a_proposal_apa_format.pdfIn PDF document text
    • http://pifedalune.medianewsonline.com/vobasobizijo.pdfIn PDF document text
    • https://cdn.sqhk.co/xowuzaseku/WyVFjdt/nora_touch_your_feelings.pdfIn PDF document text
    • http://midarujiwuvi.mygamesonline.org/celta_lesson_plan_example.pdfIn PDF document text
    • http://fesotisifofil.mygamesonline.org/fine_blanking_process.pdfIn PDF document text
    • https://cdn.sqhk.co/sejujona/eKWciis/69374417164.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jekivuzogir.rf.gd/sovod.pdfIn PDF document text
    • http://newemepakirid.myartsonline.com/4939405414.pdfIn PDF document text
    • http://mafolizol.rf.gd/angry_birds_2_apk_2019.pdfIn PDF document text
    • http://ziwemasux.myartsonline.com/dawanatojabaveluma.pdfIn PDF document text
    • http://kavibajegis.onlinewebshop.net/how_to_get_gamestop_coupons.pdfIn PDF document text
    • http://bowegeta.rf.gd/cisco_sg200-26_admin_password.pdfIn PDF document text
    • http://lewalogedo.epizy.com/aprender_alemao_basico.pdfIn PDF document text
    • http://gedamodeges.epizy.com/62303920315.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_off0000f517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF517 5736 bytes
SHA-256: a4640bef800f2c9bb2a3701d7d29cd12a16faf102a88814cc774372e19715a99
font_01_sfnt_off0001087e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087E 11612 bytes
SHA-256: 9ac29ef13366688430b16ebd72813edce54858a4af31e672b1efdbb6472d6798

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