Malicious PDF — malware analysis report

Static analysis result for SHA-256 c063dff44239c3f6…

MALICIOUS

PDF

73.6 KB Created: 2021-06-11 02:34:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 2097905b761286a83440614b637acc90 SHA-1: ca363db6b310c8af6e53454704a709ea8f0bf862 SHA-256: c063dff44239c3f6131d5a50f05d9c54f80d8a7dad100c0f8439bfed579e59d9
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains an embedded URI pointing to 'crewmak.ru', which is likely a malicious domain used to host or redirect to a payload. The document body, though heavily obfuscated, suggests a lure related to 'counting in English words PDF'. No scripts were extracted, but the PDF structure and embedded URI indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=one+to+hundred+counting+in+english+words+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450624/normal_605da8532f54f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372371/normal_6035347407d66.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469103/normal_5fc9e78fcf59e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383923/normal_6039092a9267c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444884/normal_6042c11f67d2e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411001/normal_5ff9cbb9a98bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488580/normal_600fbb1e8af35.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/6fd896ad-8e29-450c-9d46-6313319649e1/new_historicism_theory_of_literary_criticism.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c49bf682-1d4f-423c-b86c-4401edd26b51/is_india_vegetarian.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1293086e-4739-4986-910d-7cf73043f92e/kozurometatotepetevugab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36d7d383-45f2-498a-9f37-616c18034362/88770178491.pdfIn PDF document text
    • http://xuzutoli.pbworks.com/f/nimir_movie_download_hd_1080p.pdfIn PDF document text
    • http://fujiserefi.pbworks.com/f/turkey_breast_recipes_healthy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f63b5d1-fc39-4739-ac3a-a897a751f8eb/5329630431.pdfIn PDF document text
    • http://betosaxugawi.pbworks.com/f/the_care_and_keeping_of_you_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6b2edef-604c-44c8-83cb-0f9d19aab4e3/pasutenoxafure.pdfIn PDF document text
    • http://xodelow.pbworks.com/w/file/fetch/144576201/friedberg_linear_algebra_solutions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d069d938-f2b7-4282-abf4-4f37655effc7/kamojaw.pdfIn PDF document text
    • http://favixose.pbworks.com/w/file/fetch/144567192/51355211343.pdfIn PDF document text
    • http://mejigulo.pbworks.com/f/top_10_car_racing_games_for_pc_free_download_for_windows_7.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_off0000e2a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A7 5328 bytes
SHA-256: 8df9f612daa18f3997bc2128ec64cf61a9c934b23f89113a9bcdf350b7e3ca0b
font_01_sfnt_off0000f4d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D8 10044 bytes
SHA-256: cea7886b14460d79e3fb2a3579c79b319e49904ba2cde5d02dfa3beebb11f417

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