Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae957fed890a01b2…

MALICIOUS

PDF

67.9 KB Created: 2021-03-29 18:51:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 326e5fcd1a8981b4b560d1f1c50ee472 SHA-1: 44568221c821d1ce39a02e644977ee563c1e51d2 SHA-256: ae957fed890a01b2fccc792598d92e882b157ba5a96a0b51071eb029782dbc4b
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, appears to contain keywords related to study guides, indicating a lure to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jumiwimov.ru/aws?utm_term=ib+physics+study+guide+tim+kirk+pdf PDF link annotation
    • https://gemuxobupi.weebly.com/uploads/1/3/2/6/132682013/ed0278b.pdfIn PDF document text
    • http://potawuzaj.medianewsonline.com/35975518384.pdfIn PDF document text
    • http://didazema.mypressonline.com/86166105361.pdfIn PDF document text
    • https://cdn.sqhk.co/gagobuniponi/ilQC9ji/49646142081.pdfIn PDF document text
    • https://rezisepadas.weebly.com/uploads/1/3/4/2/134235668/bekagaro-tonabize.pdfIn PDF document text
    • https://cdn.sqhk.co/tusenepobam/9zjewhg/crash_io_3d_io_games.pdfIn PDF document text
    • https://sadebisoj.weebly.com/uploads/1/3/2/3/132302749/4909571.pdfIn PDF document text
    • http://nakidki-alkantara.xyz/32382316328vkk0k.pdfIn PDF document text
    • https://rapovadok.weebly.com/uploads/1/3/4/7/134705404/2560229.pdfIn PDF document text
    • http://tulavesew.getenjoyment.net/jivobab.pdfIn PDF document text
    • https://cdn.sqhk.co/zomuzuta/Wkf0jb0/veguvovemuda.pdfIn PDF document text
    • https://cdn.sqhk.co/vekuperik/ejd3jgi/houseparty_games_app.pdfIn PDF document text
    • http://xedeporib.medianewsonline.com/st_croix_greenfield_pellet_stove_cost.pdfIn PDF document text
    • https://gekowodi.weebly.com/uploads/1/3/5/3/135321574/5c05a.pdfIn PDF document text
    • https://cdn.sqhk.co/worekoxe/crMyKXw/terakelobofe.pdfIn PDF document text
    • http://se-mrush.com/75524655825saij2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d7d926d-72e2-49c6-bef0-a007028344d6/phonak_brio_3_hearing_aids_cost.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75d4dcdc-0852-49db-9769-b4add7aaad80/college_physics_a_strategic_approach_4th_edition_access_code.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c504cabc-d87d-432f-aa41-550416307815/how_long_is_navy_dive_med_school.pdfIn PDF document text
    • http://duribolatajofa.atwebpages.com/comtrend_default_password_ar-5381u.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_off0000cab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB6 5572 bytes
SHA-256: bb4acff7c92f5d3735fbe9b0aaace686c727d4bdcae90c04de63255356f3551c
font_01_sfnt_off0000dd86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD86 10420 bytes
SHA-256: 084f6b5dd499b3cbbe95fe8175e6dc408c9751e8bae594a8264bc83aeebcf9df

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