Malicious PDF — malware analysis report

Static analysis result for SHA-256 55ef08637f796adc…

MALICIOUS

PDF

125.7 KB Created: 2021-02-22 18:58:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 1bc4086d9bde047516c364a9dd9f5efc SHA-1: db9c6dde6b1c73dbc1a1694b065e040b58e829ca SHA-256: 55ef08637f796adc9a708a7babbf5e1a1eb19c7415f450e8249dc2aef55a65c0
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://jottigo.ru/123?utm_term=the+blind+side+book+sparknotes PDF link annotation
    • https://cdn.sqhk.co/vomisape/iasUbRr/list_of_all_word_board_games.pdfIn PDF document text
    • https://sirususi.weebly.com/uploads/1/3/1/4/131407567/zasawativosopuxi.pdfIn PDF document text
    • https://cdn.sqhk.co/numiwuzuwix/cBZX5QR/96977319344.pdfIn PDF document text
    • https://pirubanulap.weebly.com/uploads/1/3/4/8/134847944/172780ed293637.pdfIn PDF document text
    • http://midazimika.iblogger.org/verbal_ability_book.pdfIn PDF document text
    • https://cdn.sqhk.co/tobipamu/hagfgeW/cinemark_peru_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/nagebagem/dDihgju/best_3d_archery_scope.pdfIn PDF document text
    • https://cdn.sqhk.co/nofoxanu/g9hcYgi/best_slasher_horror_movies_on_netflix.pdfIn PDF document text
    • https://bunozejat.weebly.com/uploads/1/3/4/3/134387809/xevofubujuguv.pdfIn PDF document text
    • https://cdn.sqhk.co/ledodatefu/XghajgO/shooter_mcgavin_running_gif.pdfIn PDF document text
    • https://cdn.sqhk.co/zejegure/HhbNS7R/live_football_on_tv_today_england.pdfIn PDF document text
    • https://guxitokos.weebly.com/uploads/1/3/2/6/132681611/jatijigomofej.pdfIn PDF document text
    • https://cdn.sqhk.co/ritasuxa/TVbhh7e/steam_cleaner_walmart_rental.pdfIn PDF document text
    • https://mimitokiwunas.weebly.com/uploads/1/3/4/0/134012498/4314791.pdfIn PDF document text
    • https://ledijonag.weebly.com/uploads/1/3/4/6/134689342/0c1431d981.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jenagubadopi/fallout_4_raider_settlements_guide.pdfIn PDF document text
    • http://tebalakafepikob.rf.gd/10748777308.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_off0001b32c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B32C 5200 bytes
SHA-256: 49640ff4e33aaa57e894c5ba1b6539d2b09e2ca386cd416e1650e1def2f9751a
font_01_sfnt_off0001c4c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C4C5 10820 bytes
SHA-256: 8922ce3131ffe426e107937e678cf21ce2201cebd3819f543e208e983d06c7cb

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