Malicious PDF — malware analysis report

Static analysis result for SHA-256 a37ccf62fe32afd8…

MALICIOUS

PDF

71.3 KB Created: 2021-03-24 15:30:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 584127c90e55e9fbcf4f4db39dbe3444 SHA-1: 74536535c99e1ed559711e97286c5688627d4eec SHA-256: a37ccf62fe32afd81eeb2fc0133cb49e3848bc26a646cc5049f4b45a5f64aa29
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains numerous embedded external links, with the primary malicious URL being https://soxebez.ru/wix?keyword=old+flames+lyrics+kesha. The PDF structure suggests it's part of a link farm designed to redirect users to potentially harmful content.

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://soxebez.ru/wix?keyword=old+flames+lyrics+kesha
    • https://pevaluxuduta.weebly.com/uploads/1/3/4/5/134502983/vivexapuloz_loxig_nixesile_vadisibazawo.pdf
    • https://japapitamamevoj.weebly.com/uploads/1/3/2/7/132740309/6112202.pdf
    • http://free-at.pro/dark_souls_2_cheat_engine_item_id33l82.pdf
    • http://jakor.pro/dinamicas_de_presentacion_para_alumnos_de_primero_de_secundariawvu97.pdf
    • http://podarokinsta.site/wefebp6lpp.pdf
    • https://laxukiwu.weebly.com/uploads/1/3/1/0/131070933/daxiromej-zunogakaxumemi.pdf
    • http://drive4mclaneeffingham.com/hover-_1_scooter_eaglej2wy0.pdf
    • https://cdn.sqhk.co/rapedipular/UhjANge/color_roll_3d_reviews.pdf
    • https://cdn.sqhk.co/gazegarov/oX8haii/centurylink_outage_colorado_springs.pdf
    • http://itdiscounts.pro/john_deere_lx176_hood_replacementrxr78.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ebd73b9a-b255-48a5-b781-2bd84b483b4c.filesusr.com/ugd/956c05_3a9090d6478d403b8109a7984e7f25a2.pdf?index=true
    • https://75e6d08a-b14f-4c2c-bd4e-3e6431d9d11c.filesusr.com/ugd/497a87_880551b368cf4a508a82698982eaf2a1.pdf?index=true
    • https://5e0c4d4d-41f9-428c-9564-b93e7cff6769.filesusr.com/ugd/510691_884832b2a06d47eba0b5ef4be592c738.pdf?index=true
    • https://0c3b2bb2-3ac9-4e0e-a0b2-530a831cdf0d.filesusr.com/ugd/23193f_f5a6145f9a7e43c9aec793ce50921bca.pdf?index=true
    • https://s3.amazonaws.com/gogonof/l_p_full_form_in_medical.pdf
    • https://s3.amazonaws.com/xilasisefi/5287463529.pdf
    • https://s3.amazonaws.com/baxunaf/xewezirofonitujuzalepo.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_off0000d989.bin
ad2e71136447e557e8dcc0f86400b4cea937030e009cbe07f07e2bb4bacb2961		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD989 5452 bytes
font_01_sfnt_off0000ebef.bin
eda59a63900663af581d8a8f1d3c8d4b81f2ae4f88704040e8a11d1682ea9846		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEF 10652 bytes

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