Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d691ccdaede177c…

MALICIOUS

PDF

72.9 KB Created: 2021-03-27 20:07:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 51735b7a55de30d30d9da6d9f80134bc SHA-1: 0c6498af89ee670fde35ec84f98d614669381f01 SHA-256: 1d691ccdaede177cd9a80846b68f54f27f69f30b4f1488c7b2523acf6d934b46
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, appears to be a disguised worksheet, a common social engineering tactic to entice users to click on malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://vilenefex.ru/wix?keyword=ice+age+movie+science+worksheet+answers PDF link annotation
    • http://cloudplay.xyz/what_did_radical_republicans_do_during_reconstructionnn9vr.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407664/normal_6006c86c14b35.pdfIn PDF document text
    • http://daravto18.ru/wood_turning_projects_kitseloa6.pdfIn PDF document text
    • http://zelopaqq.xyz/fubepujixosezukizifaxuwo29rjf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450430/normal_603cedfab7f3a.pdfIn PDF document text
    • http://seamanygau.best/lusapeludabifazijepu6hmo1.pdfIn PDF document text
    • http://wixujikubipom.mygamesonline.org/basic_math_formulas_for_asvab.pdfIn PDF document text
    • http://itclick.pro/2012_jeep_grand_cherokee_oil_service_resetuhnm0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488572/normal_5fe9c839272fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386081/normal_60556069c7ad4.pdfIn PDF document text
    • http://com-connexion.xyz/zavilukibutisugowiysb1l.pdfIn PDF document text
    • http://wgathering.org/online_exam_system_project_report_in_phpujizq.pdfIn PDF document text
    • http://weex.info/tamil_songs_2017_audio9v6by.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/wiwamoxamo/4502958168.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e868398-e833-4844-ab38-860f25253a97/vodewupi.pdfIn PDF document text
    • https://s3.amazonaws.com/wikurixobelu/bubifumitozezuxaki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af17cf70-053c-4614-a0fd-d12dda2d3a80/why_does_my_ac_light_keep_blinking.pdfIn PDF document text
    • http://vunonam.atwebpages.com/juwibasizinererivixenos.pdfIn PDF document text
    • https://s3.amazonaws.com/wifiduxezo/donner_and_blitzen_river_fishing_report.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisigetizoxif/family_medicine_clerkship_study_guide.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_off0000e031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE031 5336 bytes
SHA-256: d49499d325205efa35c8806eca98851a547b6e6a578237178c18a89a24711cbc
font_01_sfnt_off0000f241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF241 10504 bytes
SHA-256: 815e53aaaa66905b40126ce0a03060c18bda218c33755c675e2f838529dae3ff

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