Malicious PDF — malware analysis report

Static analysis result for SHA-256 6541fc55555a2641…

MALICIOUS

PDF

76.1 KB Created: 2021-03-09 21:46:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 2caf6d617dcfb45e5a0bfac1e3174098 SHA-1: 6ab289dddb2ddf0a05bdbf4bdfccdaa994cdd1f9 SHA-256: 6541fc55555a2641a6ab57dda28c25d48bf95d77d186637e5b2ecf3a117884db
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URL pointing to 'baarspo.ru', which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, appears to be a lure related to vehicle parts, suggesting a targeted phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/strik?utm_term=6.0+powerstroke+oil+filter+housing+check+valve PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4448713/normal_5fdc028c017de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454971/normal_60150d6068f56.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489237/normal_602dff590c0b1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418369/normal_5fcd6491a66e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458394/normal_5fd68a6c4aaba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414494/normal_5fd308f4eaa1b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473379/normal_5ff3b07939a15.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495696/normal_5ff8dde86e916.pdfIn PDF document text
    • http://nokigafapo.22web.org/repol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409610/normal_60242989dcafd.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/divelatoxa/fisher_and_paykel_dishdrawer_troubleshooting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6981421-4ef5-4293-b6ab-03870f52eae3/clinical_pharmacology_and_therapeutics_author_guidelines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18da367f-1319-4ac0-b5f1-e577934caacc/vicks_humidifier_cleaning_instructions_v750.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f674ef5-abb7-4ec6-8fbc-aa5399374e19/maytag_legacy_quiet_series_300_dishwasher_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b649d5ed-ed34-4537-b056-21e189f4ae10/ryobi_3100_pressure_washer_problems.pdfIn PDF document text
    • https://s3.amazonaws.com/besafefaf/informatica_mdm_interview_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/zeworibuzoza/simple_reading_comprehension_worksheets.pdfIn PDF document text
    • http://bibobega.epizy.com/wazubisekakufawunuvumewab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb66c458-a70d-4827-a37d-913cd44c86f9/fubasufovenamawomopopepam.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_off0000ea63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA63 5728 bytes
SHA-256: 6cd18484285c1c93af568fd5564fab106c52005b60e4bd6705aa4302ef365e56
font_01_sfnt_off0000fe08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE08 10876 bytes
SHA-256: 01ced1cd908b23fcded60411b67e391b08c6dba160e08b508ce67782ec4d4933

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