Malicious PDF — malware analysis report

Static analysis result for SHA-256 61e59aebce10099e…

MALICIOUS

PDF

74.8 KB Created: 2021-03-28 19:23:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 9ee5b341a539f4dbce493cf935d2932b SHA-1: e521a7fbc545a966dab310edb58165de7b50b3ee SHA-256: 61e59aebce10099ef68de4ce8c5d51385eef2ce14d882447f3a80f0a213c5a5b
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one pointing to a suspicious domain (vilenefex.ru) that is likely part of a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent. The presence of embedded URLs and a link farm heuristic further supports the conclusion that this document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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/123?utm_term=administrative+management+approach+pdf PDF link annotation
    • https://cdn.sqhk.co/nuxarufodir/wgjiggd/1344336205.pdfIn PDF document text
    • https://cdn.sqhk.co/sadudolamom/OV6gigA/galaxia_sailor_moon_gif.pdfIn PDF document text
    • https://cdn.sqhk.co/posukomokufi/ftChcLT/67507199315.pdfIn PDF document text
    • https://labelamujevodit.weebly.com/uploads/1/3/1/6/131606697/9574837.pdfIn PDF document text
    • http://keruluzo.medianewsonline.com/calculus_limits_download.pdfIn PDF document text
    • https://gosasaweju.weebly.com/uploads/1/3/1/3/131384289/1169694.pdfIn PDF document text
    • https://namosozevo.weebly.com/uploads/1/3/0/9/130969937/fedofojutedikit_zakupet_sokivadixesaxez_xakevopupetiduv.pdfIn PDF document text
    • https://cdn.sqhk.co/wagomito/3UDhjii/18382640605.pdfIn PDF document text
    • https://cdn.sqhk.co/gotoruzud/K24NhhL/10705977204.pdfIn PDF document text
    • http://leninuludobodu.mygamesonline.org/67315255653.pdfIn PDF document text
    • https://cdn.sqhk.co/toxodabatot/Rihjcje/jigonosurudilu.pdfIn PDF document text
    • https://cdn.sqhk.co/zobunifi/jigdU7f/xisiso.pdfIn PDF document text
    • http://fegiroxopirez.sportsontheweb.net/animal_kingdom_orlando_map.pdfIn PDF document text
    • https://cdn.sqhk.co/foletesubuf/9Cgjp4b/mini_speedy_dupe.pdfIn PDF document text
    • https://vajojesorenum.weebly.com/uploads/1/3/0/9/130969616/wijomap_fararudido_bexilib_jikesudij.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xulepiwa/tixenepafokeduxadamifok.pdfIn PDF document text
    • https://s3.amazonaws.com/bulozor/buxokegatakunafu.pdfIn PDF document text
    • https://s3.amazonaws.com/zasepo/esc_af_guidelines_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/vipuxafol/10502972241.pdfIn PDF document text
    • https://s3.amazonaws.com/najubu/chrono_trigger_official_strategy_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/divexikav/81741818075.pdfIn PDF document text
    • https://s3.amazonaws.com/kugelilizibuwum/92969016296.pdfIn PDF document text
    • https://s3.amazonaws.com/gujutavevive/friendship_day_quiz_with_answers.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B0 5584 bytes
SHA-256: e53aa7fda09ebeed7c6666845ba450ddbf6a511c921b2f879593a35f81af3ceb
font_01_sfnt_off0000f78d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78D 11164 bytes
SHA-256: 1cd9da9435d90fd6fdc2ce32572918c29ea92c31d86af8238e66273f73ad89bf

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