Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbd3903478b45b25…

MALICIOUS

PDF

73.2 KB Created: 2021-03-24 02:32:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e19791bcf9c69143ded3f511aedff57f SHA-1: 1f2ae9e37d19763f1fc95163b091022a601734c7 SHA-256: fbd3903478b45b2591ad80f1181e7e9d391d634c343bb09434a9380ac1ad408f
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a PDF phishing or SEO link farm attack. It contains numerous external links, with a critical heuristic specifically flagging a 'PDF_SEO_LINK_FARM'. While no scripts were extracted, the presence of embedded URLs and the nature of the heuristics suggest an attempt to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/strik?utm_term=epson+xp+820+ink
    • https://cdn.sqhk.co/kidobogi/fHhjsia/apology_letter_to_customer_complaint_template.pdf
    • https://cdn.sqhk.co/salobosemiv/ibZiage/94155870331.pdf
    • https://cdn.sqhk.co/forinabam/iiejJ3n/momusovojoz.pdf
    • https://static.s123-cdn-static.com/uploads/4426422/normal_5ff66fd3dc472.pdf
    • https://cdn-cms.f-static.net/uploads/4450147/normal_602b5e2450519.pdf
    • https://dejuxowiku.weebly.com/uploads/1/3/0/7/130738850/1898401f.pdf
    • https://cdn.sqhk.co/limexofure/djiLghO/launch_monitor_cyber_monday.pdf
    • https://cdn.sqhk.co/borefigux/iajcCje/world_cup_2022_stadium_wallpaper.pdf
    • https://cdn.sqhk.co/wojusipi/igdZjhQ/51438461482.pdf
    • https://bawufavipefal.weebly.com/uploads/1/3/0/7/130740211/130d888d3f7e.pdf
    • https://cdn.sqhk.co/vasinabew/mjclDgj/derwent_colored_pencils_72.pdf
    • https://cdn.sqhk.co/zovitamojim/Ehgicm1/thora_birch_net_worth_2018.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/97d7aa88-b975-4a2c-9c29-433ce576a7bd/how_long_can_you_do_the_10_day_green_smoothie_cleanse.pdf
    • https://uploads.strikinglycdn.com/files/36bdf5b1-e596-4770-bbdb-6842fd607ce1/dulakonid.pdf
    • https://s3.amazonaws.com/wexukufedepim/weather_channel_app_for_android_tv.pdf
    • https://s3.amazonaws.com/naxozelozude/39504992181.pdf
    • https://uploads.strikinglycdn.com/files/52082d5d-13bc-47e3-a081-d9998840ce96/how_to_use_walgreens_infrared_instant_ear_digital_thermometer.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2de.bin
cc13cc20fde199bc2f279d3785530d47192c6de078496395b9cbc932a2edee03		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2DE 4620 bytes
font_01_sfnt_off0000e296.bin
41b26a93dfe527942c250bd85e55b4a9662c1ca80f2e1ca3336dd741d4b07212		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE296 11132 bytes
font_02_sfnt_off00010876.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10876 4324 bytes

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