Malicious PDF — malware analysis report

Static analysis result for SHA-256 8051caf16ad30a99…

MALICIOUS

PDF

75.1 KB Created: 2021-04-04 00:06:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 13b13c10ac5f72f8ce006fc2a442612a SHA-1: 01d5e2de8aa9c301286b8d8e4ad276b1fd5eccae SHA-256: 8051caf16ad30a99a02d5a4f7332bfc4421de1c16ab80ac20e01c5b748066054
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was identified as malicious by multiple heuristics and an ML classifier, indicating it likely serves as a phishing or malware distribution vector. It contains a significant number of embedded links pointing to external websites, including a known malicious redirector at `https://dafemum.ru/wix?keyword=what+are+you+gonna+do+gif`. The presence of a link farm on disposable hosting suggests an attempt to obscure the ultimate destination or to host a large number of lures. No scripts were extracted, but the PDF structure itself facilitates redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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.
  • 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://dafemum.ru/wix?keyword=what+are+you+gonna+do+gif In PDF document text
    • https://cdn.sqhk.co/luwanuriwaba/bhgGAdL/tutumilefivupimir.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvopone/YLbZkjg/g_h_o_s_t_words_scrabble.pdfIn PDF document text
    • https://cdn.sqhk.co/rekewuneboxu/niiiRjh/dragon_hills_golf_country_club_thailand.pdfIn PDF document text
    • https://cdn.sqhk.co/vilitemeru/ai0gjOQ/men_s_endless_run_shorts.pdfIn PDF document text
    • https://fuwefepitebu.weebly.com/uploads/1/3/4/7/134709748/komebokoradi-bematibamolamuz-werolomajik-sajubunuko.pdfIn PDF document text
    • http://xuzerujagojagip.scienceontheweb.net/69520238774.pdfIn PDF document text
    • http://kojijeku.mygamesonline.org/difference_between_bailment_and_pledge.pdfIn PDF document text
    • http://kamefutebiwef.mywebcommunity.org/68306133748.pdfIn PDF document text
    • https://cdn.sqhk.co/sejiragidu/gApii93/flat_battery_live_wallpaper_promo_code.pdfIn PDF document text
    • https://zewevenetox.weebly.com/uploads/1/3/4/4/134477768/pukirowaxapodejivob.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/xijuxosisomuna/ak_47_kannada_movie_video_songs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb0fdb43-13fe-435e-a2b7-196391219165/electron_configuration_and_orbital_diagram_practice_worksheet_answers.pdfIn PDF document text
    • https://254a6a59-343e-4b7e-907c-c4819e171fff.filesusr.com/ugd/decf6f_ff39f0135f894758b656b00b532adb50.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a018f3c7-3012-4772-927f-705a899c80ba/merit_badge_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c945afa-9b78-41b0-b117-c1b549855546/24252642322.pdfIn PDF document text
    • https://s3.amazonaws.com/fewunadupop/69456524250.pdfIn PDF document text
    • https://0b670cc3-d94b-4117-8b98-7ce677fb6c21.filesusr.com/ugd/7bc559_eba8171dfeb04691bb137d093e7346ce.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/85611398-69b7-4e84-8721-84b561f3b66d/39663133060.pdfIn PDF document text
    • https://6e345194-e688-4037-aa24-2ff230a16836.filesusr.com/ugd/ce9fe1_84a897d4c43a4dec8c5d0981ee96f2e5.pdf?index=trueIn PDF document text
    • https://bc260b4e-efc2-469d-9102-9c7234992d76.filesusr.com/ugd/b1b3ad_dda2d08500fd40ccb6cff194151e6a1f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/528b54e4-5208-44f7-96c7-0cc76a977323/fundamentals_of_pathology_sattar.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_off0000e84e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84E 5072 bytes
SHA-256: 4fb09ac8bb9a6cb05ddf42137d63e86ef2ee8dd0f37650366d545113a41b3051
font_01_sfnt_off0000f9a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A4 10876 bytes
SHA-256: 867ffd2390f4ad50dfcba423693ba46a14664f1674276cbe9a07a69fc6d2229a

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