Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b767c91a5b28168…

MALICIOUS

PDF

86.8 KB Created: 2021-01-27 07:16:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: aa986e1a2df122a47dcf1354daa354da SHA-1: 13649f4251ee26e7d04b8a14957c1135e9c8ed16 SHA-256: 3b767c91a5b281681268c2f7349bb689d89dd214850bf19276560ea55b0175a1
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 pointing to disposable hosting, suggesting a link farm designed to redirect users. The document body, though heavily obfuscated, contains references to 'Michelin star guide tokyo' and 'wkhtmltopdf', indicating a lure to potentially malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

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://druttle.ru/aws?utm_term=michelin+star+guide+tokyo PDF link annotation
    • https://cdn.sqhk.co/wubunepan/jcicLhg/sibukujerimenuvawijofizum.pdfIn PDF document text
    • https://cdn.sqhk.co/xakurusuk/aEwAhjL/fastned_tesla_adapter.pdfIn PDF document text
    • https://xasigusuvenazuj.weebly.com/uploads/1/3/0/7/130739755/53b092.pdfIn PDF document text
    • http://chuvashovfamily.ru/86128377227l86ob.pdfIn PDF document text
    • https://cdn.sqhk.co/bimeniwog/CJMhbgi/neet_answer_key_after_challenge.pdfIn PDF document text
    • http://nicechange.space/human_resource_management_salary_with_associates_degreefahrr.pdfIn PDF document text
    • http://help-feedback-amzn6.xyz/flight_sim_2018_apk_mod36o3i.pdfIn PDF document text
    • https://cdn.sqhk.co/barugogip/jjgZ9ia/blue_book_construction_equipment_pricing.pdfIn PDF document text
    • https://cdn.sqhk.co/mugejufunij/XOb0t6b/hobby_stock_dirt_track_cars_for_sale.pdfIn PDF document text
    • http://larts.digital/viwenimexaxapewopub9c1oe.pdfIn PDF document text
    • https://cdn.sqhk.co/genamudazunu/anR5jaL/jirogomusifosuvam.pdfIn PDF document text
    • https://cdn.sqhk.co/vuluzazogur/jeMVzjz/74166077228.pdfIn PDF document text
    • https://luwujapi.weebly.com/uploads/1/3/4/7/134751522/16ba0388b5.pdfIn PDF document text
    • https://cdn.sqhk.co/lolajelor/jcihgjm/strategy_guide_for_clash_of_clans.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/zesotat/guided_relaxation_breathing_meditation.pdfIn PDF document text
    • https://s3.amazonaws.com/lusabifef/alien_shooter_2_android_game_free.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_off00011302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11302 5372 bytes
SHA-256: f66c1ef09c7c4f9f9f93cc4a6b897c3451f79b3705975372c26c1a757eda2abb
font_01_sfnt_off00012553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12553 14200 bytes
SHA-256: dc4253f8726cd283fc62b2fecfaeaabebddd71f2b5e4ab18a9f1e89636a68e85

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