Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2607a736a46e9f3…

MALICIOUS

PDF

75.0 KB Created: 2020-12-28 06:52:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: d1a04d167deebf779c1928d1f9929124 SHA-1: b3a8410909068ccf9ffc860b22ef11ea053d1bd7 SHA-256: d2607a736a46e9f3d33e0609d31cc9cd813aee693e02beb4b170a4c444af4929
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to lure the user to external, potentially harmful, content.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffking.ru/strik?utm_term=pixies+band+songs In PDF document text
    • https://tafajasezo.weebly.com/uploads/1/3/4/3/134312542/d40eb2337774.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413375/normal_5fbc03449f2c0.pdfIn PDF document text
    • https://cdn.sqhk.co/zipodumup/vR6O2jg/4_function_calculator_target.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369794/normal_5f8a19d141d04.pdfIn PDF document text
    • https://cdn.sqhk.co/renapudovi/HibjbIx/fumowimojajanalinexuge.pdfIn PDF document text
    • https://zovuwiveja.weebly.com/uploads/1/3/4/8/134880504/sururamegupume-dobebezekuvus-dojorefalozaga-vubinoveni.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485580/normal_5fbc67e2bcdd0.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/e367b9bd-da3e-4bd1-b1cb-8c35accdb63a/xipituzifumadewasuzo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d3e7994-705f-4e00-9261-04d9fcb9db72/fanedosegap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e94b6d53-a0d2-4016-9bd6-b8b461c4accd/translate_spanish_to_english_translation.pdfIn PDF document text
    • https://s3.amazonaws.com/kefodek/basic_grammar_quiz_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c989d322-9dcc-4f43-9365-114917c3932f/drag_racer_v2_hacked.pdfIn PDF document text
    • https://s3.amazonaws.com/posufij/hp_laserjet_pro_m402dne_user_guide.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_off0000e65b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65B 5076 bytes
SHA-256: b8787b419571e3b64a91249c435d2a78f8b56837e204bc84397fda9f8a65cd5a
font_01_sfnt_off0000f7b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B4 11236 bytes
SHA-256: 0bfa2b82c472a1a7b8b191500692e48ebfc9bcd5dcfd6cebcdd3bce606f8ba09

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