Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fdf8477a3fc4ed4…

MALICIOUS

PDF

73.5 KB Created: 2021-01-12 10:53:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 44e07b27716bac593d8e17fc5c5f7ce3 SHA-1: 4ae7dd18f5294c08eb67b4d411fb16049b3b6e29 SHA-256: 0fdf8477a3fc4ed4e5d7570d96e8e7b719ab2f45704b68246882f31ca57b79dc
222 Risk Score

Malware Insights

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

This PDF file contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'traffine.ru'. It also exhibits a PDF link farm heuristic, with numerous external PDF links, including one hosted on 's3.amazonaws.com'. The presence of a 'SE_DOWNLOAD_BUTTON' heuristic suggests a lure for users to click and download, further supported by the ClamAV detection as 'Pdf.Phishing.Trojan'. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a date, but no clear textual instructions were extracted.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffine.ru/aws?utm_term=camscanner+pro+latest+version+free In PDF document text
    • https://cdn-cms.f-static.net/uploads/4372382/normal_5fbd1fe8eb1db.pdfIn PDF document text
    • https://jikevumuvovidu.weebly.com/uploads/1/3/4/3/134324483/7759895.pdfIn PDF document text
    • https://cdn.sqhk.co/kerosumumato/ihPhcia/hope_for_paws_videos_2020.pdfIn PDF document text
    • https://tufafoselebore.weebly.com/uploads/1/3/5/3/135389740/f8f4eb518bd684b.pdfIn PDF document text
    • https://site-1178690.mozfiles.com/files/1178690/nirizogatukexiw.pdfIn PDF document text
    • https://cdn.sqhk.co/vafodagusun/cijiihd/free_casino_slots_no_download_or_registration.pdfIn PDF document text
    • https://nijubalalo.weebly.com/uploads/1/3/1/4/131453980/purabudixime_kenide_pijibuzolobax.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/saxefi/gujimoperapuvativejezokop.pdfIn PDF document text
    • https://s3.amazonaws.com/wotodedaruzuk/exploring_science_8c_worksheets_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/kovozenamofox/likulepubuki.pdfIn PDF document text
    • https://s3.amazonaws.com/forupokisip/45414910817.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d65c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD65C 5032 bytes
SHA-256: 365470746d9b5b26d7db9bc8b177ff96c9fa25d19d8568141ccd7478673788de
font_01_sfnt_off0000e75e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE75E 10564 bytes
SHA-256: 1e18734960804030ce41e7beec16b2c8a2d5cfcbd76f5ff4057ae3ebdca1864c
font_02_sfnt_off00010b52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B52 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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