Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1b0bcc5053cb469…

MALICIOUS

PDF

74.3 KB Created: 2020-11-18 20:30:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ea818df8aa7c2d7f63b0679480c786bf SHA-1: 69e9e93d102519bf92cab6a660d19b0c60c8f034 SHA-256: e1b0bcc5053cb469dfd3e69f411848b869768f864a93ee8d55a09358e28ac75a
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting it is part of an SEO spam or phishing campaign. The document body, though heavily obfuscated, appears to be a lure related to 'project finance model example'. No scripts were extracted, but the presence of numerous external URLs points towards a phishing or malicious redirection attack.

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://traffset.ru/123?utm_term=project+finance+model+example
    • https://paripipedaninez.weebly.com/uploads/1/3/4/4/134444050/5167154.pdf
    • https://vidojibirulon.weebly.com/uploads/1/3/1/0/131070792/4903077.pdf
    • https://cdn-cms.f-static.net/uploads/4387430/normal_5f90ce4058153.pdf
    • https://cdn-cms.f-static.net/uploads/4387582/normal_5fa98b772ee07.pdf
    • https://cdn-cms.f-static.net/uploads/4415742/normal_5fadfb8b43365.pdf
    • https://cdn-cms.f-static.net/uploads/4369509/normal_5f95f5059d104.pdf
    • https://fejisamuzek.weebly.com/uploads/1/3/4/6/134636520/togenivifab_gajorapilizobit_rufudikekuguj.pdf
    • https://cdn-cms.f-static.net/uploads/4463808/normal_5fab1714d1644.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/cb58d18b-b2e3-46aa-8ad5-56e807b49316/pumawipojugarukujer.pdf
    • https://s3.amazonaws.com/zuxadol/41936273203.pdf
    • https://s3.amazonaws.com/zupenafud/cartesian_vector_form_2d.pdf
    • https://s3.amazonaws.com/memul/74155895002.pdf
    • https://s3.amazonaws.com/zeworibuzoza/14895762834.pdf
    • https://uploads.strikinglycdn.com/files/865653c1-12eb-4e4a-b55b-78c9d6400f59/new_orleans_pizza_restaurants.pdf
    • https://s3.amazonaws.com/vikukinumet/30551740322.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf00.bin
55a4332bef957eb41999e186af29da3c4c63bd420f540e381c83d8f9d80319bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF00 5268 bytes
font_01_sfnt_off0000e0e1.bin
ed47e2e2b5a03e18c895010a703d2e5cb594dfb64127dac4515cb2f8fe351c15		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E1 10936 bytes
font_02_sfnt_off00010651.bin
d8e01b36577424073da3f42bbce7a1c009b73c69e0731f36f4d557cb60bbae5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10651 16368 bytes

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