Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9f127346c5eff56…

MALICIOUS

PDF

85.3 KB Created: 2021-03-21 11:23:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b687f2ff303ef5f30bd9e1571166b1c SHA-1: 1460ade440044fb41c47dadc51eaf79f99c52939 SHA-256: f9f127346c5eff56bfb339c311048b0dc30dbdd6aad212623272a902446a8d02
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, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a phishing or link-farming attack. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a malicious document, likely intended to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://crophysi.ru/123?utm_term=proper+broad+jump+form
    • https://pupazugosabi.weebly.com/uploads/1/3/4/8/134868946/4068555.pdf
    • https://pexigupor.weebly.com/uploads/1/3/4/9/134901766/vukalepuxan.pdf
    • http://idem-peshkom.ru/skyrim_prima_guide_downloadygqms.pdf
    • http://funseeds.site/30604723459mxyux.pdf
    • http://front-glass.website/gilapejelabrtfn.pdf
    • http://manthoughtswebsite.website/kunumasag9j70g.pdf
    • http://kdghy.online/fimokihm6ag.pdf
    • http://myimperfectmomlife.com/moninawewidijetagc0ipj.pdf
    • http://remont-pc.website/kovopizesisukizifopen9hvv0.pdf
    • http://uscarins.info/jizasugav7zy0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/ganubifirigevi/wufovafidexaborokofodefi.pdf
    • https://uploads.strikinglycdn.com/files/d991437e-8da8-421b-8aa8-db33827d1fed/70785790585.pdf
    • https://uploads.strikinglycdn.com/files/8f89a58c-58ce-4e8b-a676-fc90dc97b7ba/what_chapter_does_kvothe_call_the_wind.pdf
    • https://uploads.strikinglycdn.com/files/cdc4d342-58f4-4ff9-a21a-4b1b1b395a7e/17628751593.pdf
    • https://uploads.strikinglycdn.com/files/00188e60-d37c-41ca-9f24-bbe85dc9bdda/free_football_playbook_template_word.pdf
    • https://s3.amazonaws.com/nitatotol/wuzuramaruwoj.pdf
    • https://s3.amazonaws.com/fovezewi/29652751771.pdf
    • https://uploads.strikinglycdn.com/files/57178d1f-f3c1-49d2-a822-e68b26707e6b/powekekirudefapalezed.pdf
    • https://uploads.strikinglycdn.com/files/1e73d1e5-cf55-4b46-9618-c6e3a88309aa/59187852682.pdf
    • https://uploads.strikinglycdn.com/files/0f96042f-4c96-4a0e-98f2-0cecdccff635/vefilugamego.pdf
    • https://uploads.strikinglycdn.com/files/ed9e4358-1002-450f-a139-e85ca8dccccb/jepifavipiw.pdf
    • https://uploads.strikinglycdn.com/files/bcb95518-d081-426f-8db7-62a8e9cd9c04/what_is_my_ridgeway_grandfather_clock_worth.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3e0.bin
c9f8a0e30b62719c91f5c33d91c49402378d650ca37e76b7e2d69064a1d04231		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E0 5196 bytes
font_01_sfnt_off0001056f.bin
51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1056F 1800 bytes
font_02_sfnt_off00010dfd.bin
8383271ea75176de47fcf4ab92ce59b0a12d784f4b0a50548c16848564437123		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DFD 10204 bytes
font_03_sfnt_off00013129.bin
bf8f9ece8d9d74ce2d7a98a07ee1bb8f4056faf702b3b1702118181e85f1b939		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13129 16312 bytes

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