Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a37087e2be3309e…

MALICIOUS

PDF

80.7 KB Created: 2021-03-03 06:43:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: caeade3e0d0870f35555ff6096e93dd3 SHA-1: 775045aed0fec0b169c831dceb17bb04a8efedd2 SHA-256: 7a37087e2be3309eeaca78d11554cf0df0ea7341a83d609c56dc62478d28372d
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 designed to mimic SEO-friendly content, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

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://vilenefex.ru/wix?keyword=low+cost+leadership+strategy+advantages+and+disadvantages
    • https://lurenejaxerugu.weebly.com/uploads/1/3/4/7/134728533/febefudupam.pdf
    • https://xizevidunofi.weebly.com/uploads/1/3/4/3/134321119/kunasap.pdf
    • https://kunugamonigosa.weebly.com/uploads/1/3/1/8/131871761/jijowebetugoru_fabezidajufab_zuburene.pdf
    • http://zasoremejoka.iblogger.org/dictionnaire_synonyme_francais.pdf
    • http://xebasebidigu.iblogger.org/welovujidanemodex.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vabemavuputenif/poxebulitawaninodisetut.pdf
    • https://s3.amazonaws.com/lupuvogotog/44168218471.pdf
    • https://s3.amazonaws.com/wifukedot/vemugekejevagigofilube.pdf
    • http://nogomazarem.epizy.com/47912047772.pdf
    • https://s3.amazonaws.com/vovabagubajegeb/itunes_installer_32_bit.pdf
    • http://pomirunorejuso.epizy.com/assam_police_new_answer_key_2019.pdf
    • https://s3.amazonaws.com/fadupazageraf/asrock_z77_extreme6_overclocking_guide.pdf
    • http://sulowufesesikep.epizy.com/40810540735.pdf
    • https://s3.amazonaws.com/latufenaw/critical_theory_today_3rd_edition_free.pdf
    • https://s3.amazonaws.com/gomakobez/baghdadi_new_song.pdf
    • https://s3.amazonaws.com/xiwevitox/59865109299.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_off0000e83a.bin
7b8dd95782dbacd585f1fa62c7c0d2a374b52a6864c75dedd2f8a47e6af3fcc4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE83A 5532 bytes
font_01_sfnt_off0000fb24.bin
f583792fe0925e1723b49c630180e65086ca75f97612e06ddc4841190c67cd9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB24 10500 bytes
font_02_sfnt_off00011f66.bin
5cb4188777f33cd410073f8b9d14bcb5a62f3956273c75e1cc66e568e6902af1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F66 16216 bytes

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