Malicious PDF — malware analysis report

Static analysis result for SHA-256 870ce25357b3d2cc…

MALICIOUS

PDF

86.1 KB Created: 2021-03-18 19:21:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d0547ecbc19d20b9c2c0a1aa0d473c8b SHA-1: 9e9c6a4729751871d42414e2924898e17a12c767 SHA-256: 870ce25357b3d2cce5d8fe620b2735cb454ff1f97527ae01a891595df4c17fe3
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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://fokemale.ru/award?keyword=apostrophe+to+the+ocean+pdf PDF link annotation
    • https://cdn.sqhk.co/dajebala/Zhfjcgg/nagifasi.pdfIn PDF document text
    • https://cdn.sqhk.co/muvifisi/crlhf9i/samekofu.pdfIn PDF document text
    • https://cdn.sqhk.co/koluvukirate/jGjgp6X/6451554361.pdfIn PDF document text
    • https://cdn.sqhk.co/silonifer/5hf8sr4/legion_td_mega_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/xovinexesun/jfgdU7P/83975318820.pdfIn PDF document text
    • https://cdn.sqhk.co/vidujubotaf/PbCzSgg/ice_hockey_shooting_targets.pdfIn PDF document text
    • https://cdn.sqhk.co/popenewosaso/jIoQhcz/15363613777.pdfIn PDF document text
    • https://cdn.sqhk.co/tupulezi/iMT7EEU/28996770216.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://357b8bef-7330-4cfe-b31d-389db25c4d5a.filesusr.com/ugd/4c76bf_3854cb9360304926b5d9de55d4f9f965.pdf?index=trueIn PDF document text
    • https://aa4de0c4-a7fb-47f6-97fe-5721705e71c1.filesusr.com/ugd/824332_b37b625d1a14402fb1b291b4d468dcaf.pdf?index=trueIn PDF document text
    • https://c2093f15-f4fb-4bda-9582-db5404103fa6.filesusr.com/ugd/b28561_7b012b2c043742dc97221ee5e9605ca5.pdf?index=trueIn PDF document text
    • https://e0fa0743-814d-41de-b6a5-47f787911882.filesusr.com/ugd/89d2ef_13c65b50162f4640a260118a1e987fe7.pdf?index=trueIn PDF document text
    • http://temodorofeg.atwebpages.com/85168721341.pdfIn PDF document text
    • http://revodez.myartsonline.com/78596761217.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF118 4940 bytes
SHA-256: b89ea44bf2166413a39017a3373dfb0fecb2b7a3270754253b68178cae11073a
font_01_sfnt_off000101ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CE 10928 bytes
SHA-256: c3afdcf3b9dbfda1b29cb58a56fe7f8ba574ffac462305afb29906e827c38f3f
font_02_sfnt_off000126e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E1 16060 bytes
SHA-256: d1a84ba8f0e4a827a048d387db8dd5dae3538f1c7e72415b16af587a9947cdc7
font_03_sfnt_off00013b79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B79 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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