Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f52fea912171443…

MALICIOUS

PDF

85.1 KB Created: 2021-01-24 09:21:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 3f4f9207893e1a7ecd0a2b060b6a979b SHA-1: e4b42ce5e488eeeacedade94dc1f50ba95dd6d0f SHA-256: 1f52fea9121714431cb81389bd4c7c64d697a4ea4fe5d55d88e255aa39134139
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the link farm and the PDF structure itself are indicative of techniques used to lure users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://trafffi.ru/123?utm_term=mxl+4000+review PDF link annotation
    • https://kilutiwoxit.weebly.com/uploads/1/3/1/6/131636983/54816fed1.pdfIn PDF document text
    • https://mutebomex.weebly.com/uploads/1/3/2/7/132740724/gudivitotun_kegibavupufi_zijupilexido.pdfIn PDF document text
    • http://zazuvivilug.iblogger.org/96850846966.pdfIn PDF document text
    • https://lepamume.weebly.com/uploads/1/3/4/8/134882258/6701986.pdfIn PDF document text
    • https://sovopubi.weebly.com/uploads/1/3/0/7/130775052/d9246797cda.pdfIn PDF document text
    • https://wodokapiv.weebly.com/uploads/1/3/4/5/134584818/bazovafube.pdfIn PDF document text
    • https://cdn.sqhk.co/ravawiku/hitxWhf/zowejaridewumasad.pdfIn PDF document text
    • https://cdn.sqhk.co/gagupibi/cfidjaD/deer_hunting_archery_kill_shots.pdfIn PDF document text
    • http://vuxiparami.22web.org/pijid.pdfIn PDF document text
    • https://natozopito.weebly.com/uploads/1/3/4/1/134108601/ramepulugiziva.pdfIn PDF document text
    • https://cdn.sqhk.co/mopewedote/je0gfcW/calendar_july_2021_malaysia.pdfIn PDF document text
    • https://cdn.sqhk.co/kurafuso/in2EDjg/world_war_iii_black_gold_serial_number.pdfIn PDF document text
    • https://cdn.sqhk.co/tifesijoja/jeyFRhf/71980502150.pdfIn PDF document text
    • https://cdn.sqhk.co/difanemifal/cpIegiy/file_manager_software_for_windows_8.pdfIn PDF document text
    • https://pubedazemel.weebly.com/uploads/1/3/4/8/134870130/6689046.pdfIn PDF document text
    • https://cdn.sqhk.co/texivewa/Obihyjd/jolly_days_farm_time_management_games_farm_game.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xegiseko.epizy.com/ballabgarh_weather_report_today.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_off000110e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E3 4744 bytes
SHA-256: abe845650ff5d40e04b240ab69d054d7dfde19ae3e1f7f9ec8bd85e36eb33fd0
font_01_sfnt_off00012138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12138 11340 bytes
SHA-256: f788127a54119f58fc0e09d0a54706edd0463c21429a424dc83ff32ba34df73d

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