Malicious PDF — malware analysis report

Static analysis result for SHA-256 881e8b063222d908…

MALICIOUS

PDF

80.1 KB Created: 2021-02-10 07:24:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 6dccc062a9c560731dafc3f28d9e8f36 SHA-1: c89bb8d331ef7f1bd603e4736399dc4d30204c55 SHA-256: 881e8b063222d9089b1c6da05347ac4f89b27fbf42208490d57b29daa1e3a264
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it employs a callback phishing or tech-support scam lure, prompting the user to call a number for issues related to billing, refunds, or security. Additionally, a payment redirection lure was detected, suggesting a potential business email compromise pattern. The embedded URL `https://baarspo.ru/123?utm_term=yahoo+mail+not+working+on+android+2018` is suspicious and likely part of the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://baarspo.ru/123?utm_term=yahoo+mail+not+working+on+android+2018 PDF link annotation
    • https://cdn.sqhk.co/nutakurij/jjRNahi/general_tso_recipe_without_hoisin.pdfIn PDF document text
    • http://discovljzg.fun/priority_pass_form_hdfcby412.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389793/normal_5fc6d81ef2475.pdfIn PDF document text
    • http://foodguideblog.com/kepesoxorakuvaxetkvqmq.pdfIn PDF document text
    • http://domavera.ru/conjunctions_exercises_advanced9w67e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385228/normal_601a066850431.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/tadevewuju/80977706743.pdfIn PDF document text
    • https://s3.amazonaws.com/tugabijenovili/insaniquarium_deluxe_pc_game_free.pdfIn PDF document text
    • https://s3.amazonaws.com/wupuxus/24631092040.pdfIn PDF document text
    • https://s3.amazonaws.com/xeropizuwe/john_deere_and_company_annual_report.pdfIn PDF document text
    • https://s3.amazonaws.com/wujapu/cset_english_subtest_iv_study_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/gotijejaj/crime_scene_investigation_report_sample.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eeb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB6 5368 bytes
SHA-256: ea3da552e2ae689cc000e8cba673931170b932cba219ecad1d92998bdc9f3085
font_01_sfnt_off000100d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D6 10672 bytes
SHA-256: 63a2cabc8620aab0d7cc535c62875f45d8aa3e8ab6ac37ff4d52d8621732f095
font_02_sfnt_off00012556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12556 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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