Malicious PDF — malware analysis report

Static analysis result for SHA-256 809377e4ccc96c13…

MALICIOUS

PDF

80.9 KB Created: 2021-02-18 09:54:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b8fe21f4841960a5996bd875ca6904a5 SHA-1: 49c5ab433b9ed4e5721a25bbb342158687311b21 SHA-256: 809377e4ccc96c13396ac0d259765316ee5e540189d7949ab60774bfc019bf2f
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating it is likely a phishing or malicious content delivery mechanism. The file contains a large number of external links, many pointing to other PDFs, suggesting a link farm or redirection strategy. The embedded URLs and the heuristic firings strongly indicate an attempt to lure users to malicious content, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://baarspo.ru/wix?keyword=volver+con+ella+pdf+online+gratis
    • https://static.s123-cdn-static.com/uploads/4483602/normal_5ff64cea43023.pdf
    • https://static.s123-cdn-static.com/uploads/4384828/normal_5fef9db95fb64.pdf
    • https://static.s123-cdn-static.com/uploads/4494430/normal_5fcddebb174f8.pdf
    • https://static.s123-cdn-static.com/uploads/4383308/normal_5fe46da79998e.pdf
    • https://somirurawepaf.weebly.com/uploads/1/3/1/3/131381963/xobesulozuposavi.pdf
    • https://cdn-cms.f-static.net/uploads/4425910/normal_601e10db698cb.pdf
    • https://static.s123-cdn-static.com/uploads/4417145/normal_6004ff234746a.pdf
    • https://xobojurum.weebly.com/uploads/1/3/4/5/134599739/409229de9.pdf
    • https://static.s123-cdn-static.com/uploads/4452376/normal_5ff8c6653aaf0.pdf
    • https://cdn.sqhk.co/xenekifa/ibjaogd/f1_schedule_2016_japan_espn.pdf
    • https://static.s123-cdn-static.com/uploads/4457006/normal_5fe1b5c439fda.pdf
    • https://cdn-cms.f-static.net/uploads/4410441/normal_60151230a796a.pdf
    • https://static.s123-cdn-static.com/uploads/4502698/normal_5fddf80bc8ae3.pdf
    • https://static.s123-cdn-static.com/uploads/4426696/normal_5fcefbb8b1559.pdf
    • https://cdn-cms.f-static.net/uploads/4416496/normal_5fd3cef8b2fea.pdf
    • https://cdn-cms.f-static.net/uploads/4420903/normal_5fd9edd119573.pdf
    • https://wawodedirikib.weebly.com/uploads/1/3/5/3/135348651/7436eb.pdf
    • https://static.s123-cdn-static.com/uploads/4375518/normal_5ff0403ad5ae6.pdf
    • https://cdn.sqhk.co/wifopuzuxiba/rhgugdM/baby_names_with_meanings_2019.pdf
    • https://static.s123-cdn-static.com/uploads/4415740/normal_5fee2cb8bae97.pdf
    • https://cdn.sqhk.co/ginijetemepa/jjjabK4/29287463770.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000e469.bin
8fa716edddc48ebd3bddf849ae44304d7489e522a68689177355994bedf8b350		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE469 5348 bytes
font_01_sfnt_off0000f6bb.bin
06d5c8019b25663c9b35ef4737bc31854378e2247c1a413a53916851b590242d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BB 12512 bytes
font_02_sfnt_off00011f4a.bin
b1615e29a4fe6c7320d553a30418b4fece26933a192be804fa4a6c1955e67a67		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F4A 16068 bytes

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