Malicious PDF — malware analysis report

Static analysis result for SHA-256 337cf73270e686c0…

MALICIOUS

PDF

73.3 KB Created: 2021-04-17 00:13:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 97ade91ac51f3732c291cd58e9f95277 SHA-1: 0d78b39cac072f226997c08d623d830901ef6800 SHA-256: 337cf73270e686c063f4dbac6f0bff12cb14f3b748d77167d074e69c8459a863
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are associated with link farm heuristics. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URIs and link farm characteristics suggests an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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 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://baarspo.ru/strik?utm_term=what+is+my+race+if+i+am+black PDF link annotation
    • http://idealica-uficialeitalia.website/foxojam6gc3p.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421464/normal_5fe646bee2b72.pdfIn PDF document text
    • https://cdn.sqhk.co/nobipajami/gUb9Qjd/repost_for_instagram_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/godereliku/hdjicgf/14719458430.pdfIn PDF document text
    • https://cdn.sqhk.co/sasuveze/igjfShg/singing_in_the_rain_cast.pdfIn PDF document text
    • http://dresdenpharma.ru/25135627256qs7rv.pdfIn PDF document text
    • https://cdn.sqhk.co/puzadowoke/hbjlhjF/81155473466.pdfIn PDF document text
    • http://stopnutristrike.ru/what_type_of_bond_is_potassium_nitrate7bwbg.pdfIn PDF document text
    • http://normal-id.com/49978670665saggb.pdfIn PDF document text
    • http://usacreditreport.info/femoxujevagukorazekatirf2fv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382972/normal_5fc69133239df.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380858/normal_6001c70ecbc33.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/BgfBgji/jidetur.pdfIn PDF document text
    • https://cdn.sqhk.co/ponigubik/fCgggfH/63077502727.pdfIn PDF document text
    • https://cdn.sqhk.co/rafopaluko/ihakjhb/dukuluturo.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/xoxaneral/can_you_put_epsom_salts_in_a_foot_spa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccbe988c-c575-42ba-acb6-83ac6f7a5c21/what_was_the_cost_of_living_increase_for_social_security_in_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6101057-47f1-413d-8eda-153d2c858212/84688217304.pdfIn PDF document text
    • https://s3.amazonaws.com/tazopaju/ascii_text_format_example.pdfIn PDF document text
    • https://s3.amazonaws.com/rabewiruzitewa/sawukudivemobako.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57aab897-b93f-461b-a9fd-b6457ad60a34/fisejolisozuwulesunivi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81d6f6cc-79d2-4e68-aa9b-82c8968b6a3b/27448716005.pdfIn PDF document text
    • https://s3.amazonaws.com/jupoti/xomusalemarelube.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_off0000e0c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C5 5440 bytes
SHA-256: ed45a24bcebedccbccbdddcc1f8d02289b65d9cf46f05dcdfcd02b986bc8c826
font_01_sfnt_off0000f331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF331 10856 bytes
SHA-256: 2654a844f92b868cf3fc66640d02f208a31bec8a018ac97eccd1652e784be32c

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