Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bbcb24260dab1bd…

MALICIOUS

PDF

89.0 KB Created: 2021-04-10 12:43:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 484834f0b7e60561f59da0dc2dc24d0f SHA-1: 45850d92df4e27cae8f41ce04c3d5132b9dcbcfd SHA-256: 5bbcb24260dab1bde5557b0aa3a07506a2818dde5d57851846f62aece1127f96
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm. One of the primary URLs, https://vilenefex.ru/strik, appears to be a malicious domain used for distributing further payloads or phishing content. The presence of a password-protected archive lure suggests an attempt to bypass security controls by encrypting the malicious payload. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/strik?utm_term=beginning+fingerstyle+blues+guitar+cd
    • https://joxobupapi.weebly.com/uploads/1/3/1/4/131454586/mifexipete.pdf
    • http://salet.store/microsoft_word_document_download_for_windows_10ra27q.pdf
    • http://helplnstagram-confirm.com/gupidarefepikaxaxevadane6npij.pdf
    • http://heliusdesign.ru/confirmation_letter_reservation_form_hotel4uor8.pdf
    • http://tesar-krd.ru/day_of_infamy_speech_answers8nn88.pdf
    • https://cdn.sqhk.co/bulunazi/ih9u3qr/dalegogipazupibemoxef.pdf
    • https://cdn.sqhk.co/bemaxopig/eA6zCZH/vefelexaxutivewidawofovo.pdf
    • https://vuxaxumiduwo.weebly.com/uploads/1/3/4/6/134603627/13988d7c.pdf
    • http://fresh-ita.space/judinipelorugentew99.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://xatesowogexiwu.epizy.com/apa_style_bibliography_format.pdf
    • https://s3.amazonaws.com/vufupu/the_ancient_magus_bride_fanfiction_chise_father.pdf
    • http://zimeketoxera.epizy.com/algaliao_feminina.pdf
    • https://s3.amazonaws.com/jevelel/zobujax.pdf
    • https://s3.amazonaws.com/zuguvoxoki/algebra_lineal_y_sus_aplicaciones_eduardo_gutierrez_descargar.pdf
    • https://s3.amazonaws.com/jeromisixinolib/32824974086.pdf
    • http://fofomekurun.rf.gd/20612929244.pdf
    • https://s3.amazonaws.com/pisedij/anemia_falciforme_origem_genetica.pdf
    • http://xikunajuverew.rf.gd/boranogenazoruwezex.pdf
    • https://s3.amazonaws.com/gozilum/how_to_get_rid_of_voicemail_on_panasonic_phone.pdf
    • https://s3.amazonaws.com/divelatoxa/stand_by_me_movie_soundtrack_list.pdf
    • http://zinezalidoratov.rf.gd/7817712129.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef73.bin
6bdcd240368b6cc34cc58a7f113dda6948bf99ab37fe78a94f82698a5a59f166		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF73 5252 bytes
font_01_sfnt_off00010156.bin
e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10156 1800 bytes
font_02_sfnt_off000109e4.bin
50f8053b42b68d2288c19fe254600f924519e9d7e8138509841e5cc03d8f046e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109E4 11600 bytes
font_03_sfnt_off000130c4.bin
2e8807d6d891d69d01a1d71226b28b77a69d8fe5e6889cc359afa9623879b649		 pdf-font-stream PDF embedded font (sfnt) at offset 0x130C4 16224 bytes
font_04_sfnt_off000145ea.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x145EA 4324 bytes

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