Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d376a3a4b538064…

MALICIOUS

PDF

75.9 KB Created: 2021-04-08 09:25:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc5aab6e1ba63b58a4c60448934d59a5 SHA-1: aa2c5bdd995c80d7ffa6c2db88eedcc8558df7d7 SHA-256: 2d376a3a4b5380646aa97fbc9668d69be037db28c3cfa3a7eede28fc6c243bcf
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers, indicating malicious intent. It contains a large number of embedded external links, suggesting a link farm or phishing campaign. The document body is heavily obfuscated and appears to be junk data, further supporting the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://seumenha.ru/wix?keyword=krebs+cycle+worksheet+answers
    • http://vigikigopaloze.medianewsonline.com/wheel_of_life_template.pdf
    • https://pigukoziluluz.weebly.com/uploads/1/3/4/8/134896600/00879.pdf
    • http://tusiteguluvora.getenjoyment.net/20992378270.pdf
    • https://cdn-cms.f-static.net/uploads/4487382/normal_6060120d999f8.pdf
    • https://static.s123-cdn-static.com/uploads/4448995/normal_5fe3fe723f05e.pdf
    • https://viwefinorix.weebly.com/uploads/1/3/0/8/130813514/menizofulilov-zapifik-nudedaduna.pdf
    • https://cdn-cms.f-static.net/uploads/4474457/normal_6034df78347bb.pdf
    • https://kivisibef.weebly.com/uploads/1/3/0/7/130775328/bajujaxujij_gifotede_wolokut.pdf
    • https://static.s123-cdn-static.com/uploads/4496165/normal_60089ded75996.pdf
    • https://cdn-cms.f-static.net/uploads/4413982/normal_601f8802056be.pdf
    • https://dukuvewag.weebly.com/uploads/1/3/4/0/134041028/kanufosa.pdf
    • http://tejowigasinafu.getenjoyment.net/woxovesexaradonegi.pdf
    • https://folodekoj.weebly.com/uploads/1/3/2/8/132814523/duxekivuloja.pdf
    • https://cdn-cms.f-static.net/uploads/4448549/normal_60687874c656f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://c30b87d5-e38e-4f4c-8f61-e356d9eaafe8.filesusr.com/ugd/347120_82aaedb625cf475e9257c5792d01fc81.pdf?index=true
    • http://sovogezo.atwebpages.com/30133419652.pdf
    • https://ff4d9611-e7ea-45f2-85d3-f0b464ef817f.filesusr.com/ugd/48f461_1075816f4f0c4882a71b6e0efd37401b.pdf?index=true
    • https://a6132035-7465-4fe4-be4e-2faa96c22dab.filesusr.com/ugd/cf950b_2f6708aa9a6749ddb763e9599c93c815.pdf?index=true
    • 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_off0000e6ef.bin
eb94a6816d7ce5bc9f11ec8a1da4240a5f242124447acf118be6af50ef2aec2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EF 5256 bytes
font_01_sfnt_off0000f8e0.bin
a4c70cda4c28b5c94aaf26a0ce13b1757c0535d126878b7901b4558fa48590f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E0 11928 bytes

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