Malicious PDF — malware analysis report

Static analysis result for SHA-256 151714eeadceeb4e…

MALICIOUS

PDF

76.3 KB Created: 2021-03-14 16:35:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 61b733d043d7d89219377fbe70140f47 SHA-1: dcbe6f0406d629315748eafefb7c0f23f76d3305 SHA-256: 151714eeadceeb4e080e0be76429c4b4e1fb6f768ded2bfc0bed3e3279e772c8
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high probability of malicious intent. It functions as a link farm, containing numerous external URLs, with one prominent URL being https://kuzutuzo.ru/strik?utm_term=traductor+espa%25C3%25B1ol+ingles+audio+google. The presence of a link farm suggests the document is designed to redirect users to potentially harmful sites, likely for phishing or malware distribution, aligning with the Spearphishing Attachment technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://kuzutuzo.ru/strik?utm_term=traductor+espa%25C3%25B1ol+ingles+audio+google PDF link annotation
    • https://cdn.sqhk.co/rapovixovuti/Ugg8zlL/2993509187.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443608/normal_5fcb4911c27e5.pdfIn PDF document text
    • https://cdn.sqhk.co/temejikowewa/dMjcNia/easy_homemade_cake_recipes_in_cooker.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402032/normal_5ff0b48898410.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482618/normal_5fd14506b1094.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448746/normal_5fcae7867f546.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416939/normal_5fcb212611845.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3ff4c494-4984-418a-b709-7a5c611cca0a.filesusr.com/ugd/adbee0_3cd6bba1146a4f29808411dc0540bea8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5397ef23-72b9-419d-b60a-f54e3465acbd/tumetibamimadofukus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/480fcf18-42e4-481c-abbb-0cc9748444f4/53513648823.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/convert_ipython_notebook_to.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff5ee7f0-f604-483b-a71f-3fc285d9c7e4/27006588408.pdfIn PDF document text
    • https://s3.amazonaws.com/mavixu/funny_questions_and_answers_jokes_in_urdu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3dcce7e0-9966-4c03-9088-e848915cd1eb/91051863771.pdfIn PDF document text
    • https://d45380bd-a93d-4ef2-b2bd-4c7806d1f6db.filesusr.com/ugd/5d2cf3_a0f5e62822cb41dbabc61e8d210a2ff6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dorobukasawituw/25093339729.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc66faaf-a921-471b-80f2-426b9e6bc09a/to_kill_a_mockingbird_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/vebisop/spancil_hill_bagpipe_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1513a3c4-e62e-4eee-8bbf-6f4f342f9b6f/how_to_identify_stihl_chain.pdfIn PDF document text
    • https://s3.amazonaws.com/wovigebi/android_tv_box_antutu_ranking.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bad8ab1e-00b8-4082-aba2-93e390ce0a65/neopost_postage_meter.pdfIn PDF document text
    • https://b20aee1f-b1b7-4e4e-be5e-d884e4ece670.filesusr.com/ugd/10e3af_d19dd8e2a843455faac84e13b30bb008.pdf?index=trueIn PDF document text
    • https://7fc1e5b2-1dd8-4457-9de2-3dea1ab9f589.filesusr.com/ugd/fedd61_7e7745a02b2e4102940d46cc7fff2c90.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC16 5400 bytes
SHA-256: b988d6bc59d885b9943d159b435a65541bb8a6a23b458e1b311e6073de6b9d9e
font_01_sfnt_off0000ee36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE36 5012 bytes
SHA-256: d6a78c63255ab441b49e033f1529ea58957c56e1c61d3d975305952a58a14353
font_02_sfnt_off0000fbdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDF 11488 bytes
SHA-256: 7d405439ab5013a86e7c7b9cc0964b0a764542128bff93880c4db5debc87481b

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