Malicious PDF — malware analysis report

Static analysis result for SHA-256 bad95c9d3fd2dc61…

MALICIOUS

PDF

81.5 KB Created: 2021-06-01 16:00:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 03338bb8f39d45bedfcad2635cc65406 SHA-1: 34b83351fec093bda6b98e3524514001d1acf65d SHA-256: bad95c9d3fd2dc613774170fd9f9c855df298ab75d09e2b7c81d9d655afe37cb
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are hosted on disposable domains, indicating a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing or malware-hosting sites. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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://krisoc.ru/pbw?utm_term=lil+peep+crybaby+el+tatuaje+que+significa PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4488804/normal_6045143897d17.pdfIn PDF document text
    • https://fujuzelos.weebly.com/uploads/1/3/1/3/131380065/349614.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427821/normal_5fce4bddb9e9b.pdfIn PDF document text
    • https://pixerogamaba.weebly.com/uploads/1/3/1/8/131871590/pasunagunesezasave.pdfIn PDF document text
    • https://moganuvutixeku.weebly.com/uploads/1/3/1/1/131163890/6845194.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428341/normal_601f140dde665.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486351/normal_5fcb3a76692df.pdfIn PDF document text
    • https://xerirexu.weebly.com/uploads/1/3/4/5/134592073/boribajisagujo_rimefisijeroxug_sejan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373016/normal_6016df1aac0f1.pdfIn PDF document text
    • https://bewobuvepo.weebly.com/uploads/1/3/2/6/132695749/2788297.pdfIn PDF document text
    • https://bonawoxe.weebly.com/uploads/1/3/3/9/133986387/foparane.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4370555/normal_60afe7a4df158.pdfIn PDF document text
    • https://kenopawubiwo.weebly.com/uploads/1/3/4/4/134459696/zalukodukazub.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lugozamuxika.pbworks.com/w/file/fetch/144412476/12513251710.pdfIn PDF document text
    • http://zepadatoju.pbworks.com/w/file/fetch/144425181/how_to_fix_keyboard_keys_typing_wrong_characters_-_windows_7.pdfIn PDF document text
    • http://lipadune.pbworks.com/f/is_there_an_app_that_can_monitor_blood_pressure.pdfIn PDF document text
    • http://negovijalulu.pbworks.com/f/ruvizavorebuda.pdfIn PDF document text
    • http://palixazoke.pbworks.com/f/how_to_connect_denon_heos.pdfIn PDF document text
    • http://ziduzobif.pbworks.com/w/file/fetch/144455016/28592061305.pdfIn PDF document text
    • http://finebov.pbworks.com/f/ace_personal_training_manual_5th_edition.pdfIn PDF document text
    • http://jotoxipigi.pbworks.com/w/file/fetch/144447642/what_is_the_next_v8_supercar_race.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_off0000fd56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD56 5568 bytes
SHA-256: 505f2c8a5ea33f6cd64b4d1e36bc98f4b78fef1d94cd7bc8f2903c9f843b3c7e
font_01_sfnt_off00011063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11063 11824 bytes
SHA-256: 8d86119d443085aee22349f9f691b51a2391fd82655ca363f113d5757b23d706