Malicious PDF — malware analysis report

Static analysis result for SHA-256 f341c48709cfb241…

MALICIOUS

PDF

67.0 KB Created: 2021-06-02 16:18:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3a23f849b83bffe5c54cf3974591771c SHA-1: 7bc4467515dcbabb21ebfd26d593cf0eac1d2bb3 SHA-256: f341c48709cfb2414bfe95d7cf438974a4587877fb9a4a8b109805f2a146ca8b
126 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 a phishing or trojan threat. The document contains numerous embedded URLs, with one prominent URL pointing to 'ketchas.ru' which is associated with a link farm and potentially malicious content. The presence of these links suggests an attempt to redirect the user to a harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://ketchas.ru/pbw?utm_term=bahubali+video+songs+telugu+movie+come
    • https://merotulup.weebly.com/uploads/1/3/4/0/134000288/widedoseze-ludajoxagup.pdf
    • https://wogakidip.weebly.com/uploads/1/3/5/3/135384189/9835793.pdf
    • https://nuguzawopaji.weebly.com/uploads/1/3/4/0/134040365/f4bacf4403.pdf
    • https://runebipunozup.weebly.com/uploads/1/3/1/4/131406604/nojabet.pdf
    • https://dovenegipejapu.weebly.com/uploads/1/3/0/7/130740438/52e0eae366eb.pdf
    • https://refunijuxi.weebly.com/uploads/1/3/4/7/134748157/43185.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://lugozamuxika.pbworks.com/w/file/fetch/144422037/most_common_words_in_english_language.pdf
    • https://uploads.strikinglycdn.com/files/4a320ff3-bb72-454c-892f-6b0458c50f98/minn_kota_i_pilot_remote_battery_replacement.pdf
    • https://uploads.strikinglycdn.com/files/257a7d32-abd3-49ef-b6ae-8ea83d309b2d/makuwozi.pdf
    • http://gepefupugalu.pbworks.com/f/51647101902.pdf
    • http://lulimogosan.pbworks.com/w/file/fetch/144508857/24262185739.pdf
    • https://uploads.strikinglycdn.com/files/bfe4281a-ca12-4f49-8d4b-540232a306db/73571064067.pdf
    • http://pokuwatosat.pbworks.com/w/file/fetch/144455088/47830955984.pdf
    • http://jozeluwofe.pbworks.com/w/file/fetch/144418983/9.snf_fizik_dayankllk_sorular_ve_cevaplar.pdf
    • http://nuxawakaxaz.pbworks.com/w/file/fetch/144503073/12976560338.pdf
    • http://rixepal.pbworks.com/w/file/fetch/144504153/vectors_physics_class_11_mcq_download.pdf
    • http://gonumutat.pbworks.com/w/file/fetch/144508983/nalulugafojorimigoto.pdf
    • http://jajisaparev.pbworks.com/w/file/fetch/144411747/dd_3.5_best_metamagic_feats.pdf
    • http://vazesuna.pbworks.com/w/file/fetch/144501042/bawabexinami.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_off0000ccc4.bin
88de483d38eb54b7c73bcf56b88345cb39ac6ce0348c5307c1c321d3b39e507f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC4 5508 bytes
font_01_sfnt_off0000df61.bin
2893e339d1aaa2103da305e2969fb728488c8e14d73ef59ace48785ccfc62e02		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF61 9588 bytes

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