Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f5e39efdb4bca1a…

MALICIOUS

PDF

79.4 KB Created: 2021-06-05 12:36:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8764cd1475bb45c846525c0323ed3b35 SHA-1: 94cde8fd58db1ed97980ab31ebadb52c0b268b1f SHA-256: 4f5e39efdb4bca1a7945f0646ed2c05067c605efa0cfea75c71647f32ed04afc
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://resalured.ru/123?utm_term=fnma+rental+income+worksheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393485/normal_603d107a78fc3.pdfIn PDF document text
    • https://faruroju.weebly.com/uploads/1/3/5/9/135986438/xotikire_zazorepibes.pdfIn PDF document text
    • https://piteserubikidi.weebly.com/uploads/1/3/4/7/134711405/57f2623c67ce7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401696/normal_5fdbe062c3f7e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500911/normal_604dac2737a57.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458622/normal_60220d00dcafa.pdfIn PDF document text
    • https://kigimijufofudiv.weebly.com/uploads/1/3/5/9/135977026/9000918.pdfIn PDF document text
    • https://bewogataxatux.weebly.com/uploads/1/3/2/6/132695278/8252828.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/af838658-b056-405a-a2fc-0d2b800c6789/how_do_oxygen_and_carbon_dioxide_cycle_worksheet.pdfIn PDF document text
    • http://japomajuxire.pbworks.com/f/how_do_i_cook_a_small_sirloin_tip_roast.pdfIn PDF document text
    • http://rumusapage.pbworks.com/f/71751076323.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c23c235-792b-4814-bb7e-f12b3f048ea3/catholic_religion_meaning_in_urdu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64b5d931-5bfa-4c9b-aaed-c3c8ffe3287d/20529907617.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13e0346a-4445-4469-b8de-9e47fc0c5786/tugilipagowegip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7975cba-d827-45cb-a53d-caebd28a4c7c/34735703068.pdfIn PDF document text
    • http://minuwaxiper.pbworks.com/w/file/fetch/144508065/zerubejaxisizefadiwepi.pdfIn PDF document text
    • http://suniger.pbworks.com/w/file/fetch/144571845/transformar_archivos_a_online_gratis.pdfIn PDF document text
    • http://jitilabajeko.pbworks.com/w/file/fetch/144568362/regle_du_jeu_dixit_revelation.pdfIn PDF document text
    • http://fevuxowina.pbworks.com/w/file/fetch/144577365/88647918484.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c243ecc8-12b9-4b0d-bbcc-6b991e92dc4a/tekijevoze.pdfIn PDF document text
    • http://jizakatum.pbworks.com/w/file/fetch/144650610/15623499114.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_off0000f959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF959 5148 bytes
SHA-256: f5be3619ebcf6a89b6685438b76777464627f451f3f4a2d1c4d61b4f15c12768
font_01_sfnt_off00010abd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABD 11200 bytes
SHA-256: a70d26aa61a56d06a0e58858f35aac6dedc7995465334715d9720badc8f010b9