Malicious PDF — malware analysis report

Static analysis result for SHA-256 afa05773d6eb8570…

MALICIOUS

PDF

76.0 KB Created: 2021-06-07 11:13:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 94490abb443e53c15aefc8f7592ad1fb SHA-1: 40b862a3062ae9e539fe5a92d477a39f5a79360c SHA-256: afa05773d6eb85702dc4261bdc7f8ccdf58beb404c88d258aab6c3def605646a
96 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a URL that appears to be a lure. The embedded URL points to 'crewmak.ru', which is likely a phishing or malware distribution site. No scripts were extracted, but the PDF structure and embedded URI suggest a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crewmak.ru/pbw?utm_term=how+to+treat+flat-footed PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4459320/normal_5fdd8f7c2b033.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401732/normal_602239dd19e26.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486563/normal_605917651134b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375209/normal_603882a19e7c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450511/normal_603d706e50991.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452400/normal_6064dbfcdc098.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379234/normal_5fd884d0cb813.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460231/normal_602c010a11a4d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497348/normal_5fd0989c1a764.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412897/normal_5ffd4544e9e29.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470685/normal_5ffc4d777fdc2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/363b5d7e-122e-48c7-979a-73667f544bb8/mikudobewamego.pdfIn PDF document text
    • http://tisowowuduwe.pbworks.com/f/libros_de_anatomia_y_fisiologia_humana_tortora.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03c35181-19a3-45bf-9481-d5a99419a54d/how_to_clean_danby_dishwasher.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d94d5a8e-5fd9-4ec8-bc88-90677ac5b66b/rugutupipa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2852ef7e-c0d8-424b-8512-2a41d118668e/73999148154.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b9753be-6b48-4879-8cc6-141a0ca48065/how_to_bypass_icloud_lock_on_iphone_6_with_computer.pdfIn PDF document text
    • http://bupataved.pbworks.com/w/file/fetch/144420138/jonibejifarologadatutiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91a4a294-30f5-40a9-9ec1-683206429567/kayla_itsines_bbg_zero_equipment_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92b70a24-2aba-4db3-8522-e663f7ad66f9/3_purposes_of_punishment_in_the_medieval_period.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c305578-68da-4263-bb78-cb47cfb35e77/50376929055.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_off0000eeeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEB 4808 bytes
SHA-256: b507ed663ac9e54d651784f919345f1ad919b55962e7b44f410c34d837dc78e0
font_01_sfnt_off0000ff6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6A 10240 bytes
SHA-256: fdf93992b2200ff895bba14cac0a65f7436829805dec57dfbf1fab736817a4e4

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