Malicious PDF — malware analysis report

Static analysis result for SHA-256 d331b8e8044b61d7…

MALICIOUS

PDF

102.8 KB Created: 2021-01-27 12:49:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: f319011937383a24e3e7dc3518203060 SHA-1: 725e4ab3e4dc1f4ef2f8c2f530c11a78ad0b6a57 SHA-256: d331b8e8044b61d77f3409c3f489cc7f3069635a90727474b2dc91cce6a7dd7e
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, characteristic of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=statistical+analysis+using+r PDF link annotation
    • https://mizunemaki.weebly.com/uploads/1/3/4/8/134850414/totamijexezo.pdfIn PDF document text
    • https://cdn.sqhk.co/wiwuwigo/hhcXiaU/draw_your_monster_tiktok.pdfIn PDF document text
    • https://cdn.sqhk.co/surudije/hienChd/snake_and_ladder_game_free_online_download.pdfIn PDF document text
    • http://mafonofolifeda.22web.org/esl_alphabet_phonics_worksheets.pdfIn PDF document text
    • https://mojakoxo.weebly.com/uploads/1/3/0/7/130739052/f638cb2.pdfIn PDF document text
    • https://remewizefo.weebly.com/uploads/1/3/1/8/131856163/5008db.pdfIn PDF document text
    • https://reseviris.weebly.com/uploads/1/3/5/4/135400779/ludajudila.pdfIn PDF document text
    • https://woxamaxepid.weebly.com/uploads/1/3/0/7/130776503/lurinoj_betem.pdfIn PDF document text
    • https://cdn.sqhk.co/xumefotebe/JPVQifO/best_daily_planner_app_mac.pdfIn PDF document text
    • http://tuguxanofa.iblogger.org/all_sorts_of_information_meaning.pdfIn PDF document text
    • https://nuxirudeduw.weebly.com/uploads/1/3/4/4/134442083/1293030.pdfIn PDF document text
    • https://tipozuroboga.weebly.com/uploads/1/3/4/2/134265922/d0e12eb1db98.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zarevarepi.epizy.com/8828153400.pdfIn PDF document text
    • https://s3.amazonaws.com/figugipopar/baleshwar_yadav_song.pdfIn PDF document text
    • http://bisiziwaros.epizy.com/aadhar_video_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/kugelilizibuwum/nesugoraxebajunomez.pdfIn PDF document text
    • https://s3.amazonaws.com/rodigapigeta/lometiribamutuluvesosi.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013ede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EDE 5172 bytes
SHA-256: 73a8f64c218cef54f5595a8037af0e52e083efb0bbff17904d2816309f6068d8
font_01_sfnt_off00015086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15086 11788 bytes
SHA-256: fe42d0947f79604197d145a3270f371fe22a0181265083a3ec356ed07e9afec0
font_02_sfnt_off000178bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178BC 16084 bytes
SHA-256: 192e1cf8743c95d644f41697cb32af4f2bd92b7888e96aef7f61385a8dcfe722

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