Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa1d6c42f74066cc…

MALICIOUS

PDF

89.0 KB Created: 2021-03-19 07:03:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 53d8dccf63fccd0b8cd20400d738f0f2 SHA-1: 4f47f5a08e8dd7df6a165f52fd84f295e7a35f07 SHA-256: fa1d6c42f74066cc0f517b85f81094f839c36953a3331800dc0eac31596ffec6
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to obscure domains, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. The presence of embedded URLs and the heuristic PDF_SEO_LINK_FARM rule confirm the document's purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/wix?keyword=san+judas+tadeo+oraciones+para+el+dinero
    • https://zagozejidenadap.weebly.com/uploads/1/3/1/4/131407028/1275937.pdf
    • https://siresikewutawin.weebly.com/uploads/1/3/0/7/130739490/taverarubiwor.pdf
    • https://static.s123-cdn-static.com/uploads/4462075/normal_5fff5eeeb562a.pdf
    • http://bavolotaw.22web.org/wukusafisalajajije.pdf
    • https://cdn.sqhk.co/ledivure/fjiKjjp/zifite.pdf
    • https://cdn.sqhk.co/tajiwikiter/NrJNBgd/cupcake_jemma_recipes_vanilla_cupcake.pdf
    • https://kopodeju.weebly.com/uploads/1/3/1/4/131483627/mogan_tovukadirava.pdf
    • https://cdn-cms.f-static.net/uploads/4377407/normal_6015bbc8f291c.pdf
    • https://pixerogamaba.weebly.com/uploads/1/3/1/8/131871590/jedafojaxo_juninipite.pdf
    • https://megidawuxuta.weebly.com/uploads/1/3/4/7/134729580/jogonen_gefosodo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://460eb545-5389-4aa9-9e78-d1074a8bca0c.filesusr.com/ugd/21a131_131dd988f10941409f62efcedcb05b30.pdf?index=true
    • https://a1f0096d-76f5-425c-b826-5ccbd312c1bc.filesusr.com/ugd/8f8c07_7dccc19c38ec4ce592b732059556caa7.pdf?index=true
    • https://2ea9429b-0332-4ee6-bb75-ab9535b56c99.filesusr.com/ugd/e2f7e1_43e2cb3c8c734fbdb00bf0b2d341c60e.pdf?index=true
    • https://s3.amazonaws.com/mukutud/79255141127.pdf
    • http://zokazote.rf.gd/zojekolowa.pdf
    • https://dd67658a-cc17-4e1c-bca5-42bf299a485b.filesusr.com/ugd/07a440_3c18d60a1bb942618e8e5495d21cbb90.pdf?index=true
    • https://1138278f-e8d0-45ef-aef3-dbdd7428ac52.filesusr.com/ugd/5be868_be1009c1bd0a416fbf10ec90aa1cd026.pdf?index=true
    • https://s3.amazonaws.com/vedexajawo/ratifying_the_constitution_answer_key.pdf
    • http://zupotid.epizy.com/50196035953.pdf
    • http://pasudef.rf.gd/26950227174.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001192c.bin
e89ac9d74937039cc2761941fde9105021e2da770b447345194ae281dd285449		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1192C 5248 bytes
font_01_sfnt_off00012b12.bin
b91a87111e292ecd58ce781e40e3d2858bb9a090a1a7ad797ce48c4fc5ef2643		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B12 12928 bytes

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