Malicious PDF — malware analysis report

Static analysis result for SHA-256 b02b8a562b19bc09…

MALICIOUS

PDF

69.1 KB Created: 2021-05-17 07:22:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 53813a0f7213fcfbad7d54a9b568f8cd SHA-1: 25755288817777a15db02c7709363cadd3c97815 SHA-256: b02b8a562b19bc0931bc995f4a8863cb2f6165b4baa49eb79c93e93c2173119f
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, as indicated by the PDF_SEO_LINK_FARM heuristic. One of these links, https://pelibifir.ru/strik?utm_term=what+is+a+full+service+grocery+store, is flagged as suspicious. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the document structure itself is designed to redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/strik?utm_term=what+is+a+full+service+grocery+store PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4460076/normal_6025ab3eab918.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495034/normal_6039b4ab6f47a.pdfIn PDF document text
    • http://fewudutizoxom.medianewsonline.com/urea_alta_y_creatinina_normal.pdfIn PDF document text
    • http://bloodcraft.online/secret_lair_drop_series_wizards_of_the_coast_presents_after_great_deliberationju77y.pdfIn PDF document text
    • http://siondez.ru/7_principles_of_communication_pptq46p6.pdfIn PDF document text
    • http://lazirawolewok.getenjoyment.net/prince_lionheart_premium_wipe_warmer_instructions.pdfIn PDF document text
    • http://ecoservice-vlad.ru/does_excel_have_flowchart_templatesuvk64.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415051/normal_605a3993498aa.pdfIn PDF document text
    • http://dapajibidamazed.mypressonline.com/bavukikerofuvidonufimoj.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/nowokil/68739920358.pdfIn PDF document text
    • http://gutekuretejapoj.onlinewebshop.net/bw3s_menu.pdfIn PDF document text
    • https://s3.amazonaws.com/sizabo/43089776358.pdfIn PDF document text
    • https://s3.amazonaws.com/vawoginele/5925875202.pdfIn PDF document text
    • https://s3.amazonaws.com/fukepez/xokeme.pdfIn PDF document text
    • https://45f61934-b4a1-4335-a9e3-e142d9465b5b.filesusr.com/ugd/0dd040_cf4f336c85104288b6305dd62e0f6d5a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xalexojaxipud/cool_jobs_wide_world_of_robots_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/dibedamoka/tvs_aditya_birla_insurance_brokers_policy.pdfIn PDF document text
    • https://s3.amazonaws.com/bezutu/the_standard_apartments_baltimore.pdfIn PDF document text
    • https://s3.amazonaws.com/rozebofukixus/chutkule_hd_video.pdfIn PDF document text
    • https://2daccc73-8708-4113-a26a-4f38906335d9.filesusr.com/ugd/f65175_b96ddec96543463798631cdc1a9edb41.pdf?index=trueIn 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_off0000d2cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2CD 5320 bytes
SHA-256: bf6d890864b8cdeacd37bba4675ed53b6f918aaa8b1ab93b17626aa3ef6dc379
font_01_sfnt_off0000e4f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F7 9904 bytes
SHA-256: 9cc8d9889e4bd29def0a65e8a485d1f302c44e10a8a8dc1313299ee2ba3c2312

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