Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7766408b5074a8d…

MALICIOUS

PDF

107.9 KB Created: 2021-03-18 13:43:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 073bedccdc8f7fa5ba4e57609a93f575 SHA-1: a0fb6a240264dd76d9988a989f9fb06ce50cd0e5 SHA-256: f7766408b5074a8df5085df02a2355ac4d01f9cd17a8516348c0eeaa675ca02a
134 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a link farm on disposable hosting and a potential invoice/payment lure. The embedded URL, https://druttle.ru/award?keyword=english+word+synonyms+list+pdf, is a primary indicator of a phishing or scam attempt. Although no scripts were explicitly extracted, the PDF structure and heuristics suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://druttle.ru/award?keyword=english+word+synonyms+list+pdf PDF link annotation
    • https://cdn.sqhk.co/dopiporajen/gjoiiha/74854918515.pdfIn PDF document text
    • https://cdn.sqhk.co/xuwifoviwalo/ggidzhb/molovuposadosep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501645/normal_60303addba8bd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465392/normal_5ffab1764a11c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481663/normal_601031a5e202e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448116/normal_6011aa4871b9b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403141/normal_5fe5a5644fd9a.pdfIn PDF document text
    • https://cdn.sqhk.co/wijelukifap/ByjdFAl/tixenosebekemu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391898/normal_5fe1397d93d02.pdfIn PDF document text
    • https://cdn.sqhk.co/zenegiwowi/lji8lhh/xcom_enemy_within_walkthrough_ios.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367287/normal_5ff5b693f3f6b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/3e8150c0-19b6-4790-bfd8-ca39e0efeb82/asus_p6x58d-e_manual.pdfIn PDF document text
    • https://67dec473-0a9c-497c-80b1-62a4c84c5046.filesusr.com/ugd/0aab01_e4fc36aa981b43deaf9ffa11fbd420da.pdf?index=trueIn PDF document text
    • https://07d68bf2-0661-47e2-9ffe-eae068a071af.filesusr.com/ugd/fef806_a1796b12bf0348febd700d2608d8499b.pdf?index=trueIn PDF document text
    • https://e0ff2378-281a-4ea3-95ae-419c526fdc99.filesusr.com/ugd/0baf77_dc8f913bc3a7446fa39e4ec6d9cf8be5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sasufufa/82204372.pdfIn PDF document text
    • https://s3.amazonaws.com/wujapu/3931059982.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9adb1e83-1e6a-474c-8a77-e1666606bd45/71673542070.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f34d059-eca7-4b9c-98c5-9e0fc4a8b435/data_structures_and_algorithms_in_java_interview_questions.pdfIn PDF document text
    • https://s3.amazonaws.com/sorogamat/26708794671.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f685516-23c5-4a7d-9971-43b51f22b8e6/how_to_use_tub_clean_option_in_lg_washing_machine.pdfIn PDF document text
    • https://e942959e-95af-4115-ab05-a6e38533eaad.filesusr.com/ugd/66f7a0_4c1025dee4724efea91f6675f2f4f5b9.pdf?index=trueIn PDF document text
    • https://538d8494-0c7d-401a-b890-0485f6bc7bca.filesusr.com/ugd/29c71c_5b601e4eb81c46c2977599e810466fd2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tozaduliwubega/mere_pas_tum_ho_episode_6.pdfIn PDF document text
    • https://s3.amazonaws.com/woneketelak/disney_classical_piano_sheet_music.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015c56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C56 5068 bytes
SHA-256: b001125a52391bc5b90a010d0a75d23234b6b0d6b723996fd751a2e78bac49e5
font_01_sfnt_off00016d75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D75 11348 bytes
SHA-256: cd4c508a7816802b2649d9491593e45687f2cd2d943ea8440630f2bb19e4ca4d
font_02_sfnt_off00019418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19418 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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