Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0925a808e4a6c86…

MALICIOUS

PDF

119.8 KB Created: 2021-02-17 00:45:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a2c670904d43d354f2200c32d916ace8 SHA-1: 3b45aea5d273272bf2e85022d6ec5f933c44896c SHA-256: b0925a808e4a6c86a9a0b80509f44821cd6da8ae704bb94703ae7176860dc2f2
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for SEO poisoning or phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. The embedded URL 'https://jacksth.ru/wix?keyword=5th+grade+go+math+chapter+2+answer+key' suggests a lure related to educational content to drive traffic to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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/wix?keyword=5th+grade+go+math+chapter+2+answer+key PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387420/normal_5fd340d291645.pdfIn PDF document text
    • http://albatros-trans.ru/70786184029l0jhq.pdfIn PDF document text
    • https://padawevuwelidas.weebly.com/uploads/1/3/1/4/131438111/lukevilup.pdfIn PDF document text
    • https://puraxexi.weebly.com/uploads/1/3/4/7/134718411/19c9208e73233.pdfIn PDF document text
    • http://mogoxopedutisaw.iblogger.org/online_feedback_system_project_report_in_php.pdfIn PDF document text
    • http://texulateniz.iblogger.org/magolimenarikezudad.pdfIn PDF document text
    • https://saxonolofazejel.weebly.com/uploads/1/3/2/6/132681209/4ab38bb.pdfIn PDF document text
    • https://cdn.sqhk.co/dabozijide/Jie9che/fitbit_charge_4_special_edition_band.pdfIn PDF document text
    • http://vukosam.22web.org/45337040097.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/putelekireza/airplane_flight_simulator_apk_mod.pdfIn PDF document text
    • http://banobozibijur.epizy.com/fashion_brand_business_plan_template.pdfIn PDF document text
    • https://s3.amazonaws.com/jezaxojipevu/8972768930.pdfIn PDF document text
    • https://s3.amazonaws.com/dosalapasenow/cor_audit_interview_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/rogugagatuf/sailor_moon_live_action_transformations_60fps.pdfIn PDF document text
    • https://s3.amazonaws.com/sabobenuwe/46783355704.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_off00019786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19786 5872 bytes
SHA-256: 04af2fd3de47dd049d303d6a5f6602bacf5a3bf8cef3704171bc7ea1b114e340
font_01_sfnt_off0001ab74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB74 11284 bytes
SHA-256: d014316c559f88a0fb0fd6dc9a0cd7b1c90791f02847d54bcb555ab342ff4b87

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