Malicious PDF — malware analysis report

Static analysis result for SHA-256 41d5e055f054dd20…

MALICIOUS

PDF

82.1 KB Created: 2021-04-29 15:12:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 598944a291de0b38537669828055d259 SHA-1: e002312a0edb39080ba59254737775009a78aaa4 SHA-256: 41d5e055f054dd20952e2518a294dca864e8e63f83aba7d4dfd68ee44f98c25c
166 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including ML classification and ClamAV, indicating malicious intent. The presence of a 'Password-protected archive handoff' heuristic suggests the document's purpose is to trick the user into decrypting a payload. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'Qt', and the embedded URLs point to potentially malicious domains, reinforcing the phishing and malware delivery vector.

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://druttle.ru/strik?utm_term=final+fantasy+7+walkthrough+battery PDF link annotation
    • http://mmamba.ru/vocabulary_words_for_ielts_speakingefhcg.pdfIn PDF document text
    • http://checkmycredit.info/lazelutelp9vf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403806/normal_5fdc49548696c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422659/normal_60510b1edcac8.pdfIn PDF document text
    • http://rubeatyshop.xyz/300029227453hoii.pdfIn PDF document text
    • http://formblckr1.xyz/i_ll_fly_away_hymn_sheet_musicbo3bs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457305/normal_60182f09419d3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427783/normal_5fccbc6e4fbac.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jalofepo.rf.gd/10632164076.pdfIn PDF document text
    • https://s3.amazonaws.com/pogolo/telegram_bot_python_file.pdfIn PDF document text
    • https://s3.amazonaws.com/musoxifuvitalo/kufofevugakibijuxone.pdfIn PDF document text
    • http://dadagax.epizy.com/15645576061.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50d20677-b61e-4ec3-889c-6d6f2b5167d4/84336754136.pdfIn PDF document text
    • http://sakipipatepuwuf.rf.gd/98227714347.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a18718b3-cf8c-4871-a351-4c1568308fbe/gekamuzitetezamiwem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5ea8d79-6e39-4bac-a448-f5fd7d9a2ae5/how_to_get_splat_hair_dye_out_of_bathtub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0408c26a-eadb-4f81-8d83-352f406a87c5/how_to_reprogram_sentry_safe_code.pdfIn PDF document text
    • http://zobawukesilebaf.epizy.com/how_to_make_custom_keyboard_shortcuts_on_mac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8b1a69e-35c9-41c6-a8a2-25ac77ef7fe9/reply_to_thank_you_email_from_manager.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20bd8e14-ee8f-4daf-8760-67e8110bc3ed/58043286395.pdfIn PDF document text
    • https://s3.amazonaws.com/pisedij/mouse_guard_comic_review.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_off000102cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CF 5464 bytes
SHA-256: f62a4212b0cc9808eaeb4a1b54118dcd62f4c4c5b9c2b0bc5bb262a82f555bdd
font_01_sfnt_off0001158a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1158A 11040 bytes
SHA-256: ba6307a9e612278f27183ec3f0d9034e10c45047ba1beba53a3bfca33a05f3a3

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