Malicious PDF — malware analysis report

Static analysis result for SHA-256 341e765601b9d4fc…

MALICIOUS

PDF

67.7 KB Created: 2021-04-19 05:10:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 95ef63445d16dd5ad34877e7f89bef69 SHA-1: 604e732a1a0f69b01d3b59018dc602c59aa32e79 SHA-256: 341e765601b9d4fcb3ad58e422cfebbba5e4660c7aac2c99fb459e8cf6f61730
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external URIs, with a high heuristic score indicating it's part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful content.

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://leonvi.ru/strik?utm_term=ejercicios+online+agudas+llanas+y+esdrujulas PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408997/normal_6065925ac7124.pdfIn PDF document text
    • http://zesegalos.scienceontheweb.net/gagodenogam.pdfIn PDF document text
    • https://virerulifig.weebly.com/uploads/1/3/1/4/131407283/8535165.pdfIn PDF document text
    • http://midunetojonawiw.mywebcommunity.org/arduino_starter_kit_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/madumubo/gi4FTgi/gajupomixalubu.pdfIn PDF document text
    • https://cdn.sqhk.co/tezuzerise/xjifgdv/knights_charge_brawl_deck_upgrade.pdfIn PDF document text
    • http://jajuviramigawo.medianewsonline.com/what_is_the_point_of_antigone.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391326/normal_6002071c4151b.pdfIn PDF document text
    • https://cdn.sqhk.co/ridefapagol/ejijja6/300_english_nursery_rhymes_songs.pdfIn PDF document text
    • https://cdn.sqhk.co/xovujiroveg/2ie8hie/42472375969.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401691/normal_6042f87554ca9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379614/normal_5fd3127ac3e7f.pdfIn PDF document text
    • https://ragivigelogupow.weebly.com/uploads/1/3/4/5/134525503/4e146469.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379034/normal_601cf6f97422f.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/sitok/dog_sled_saga_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/lanubili/public_administration_degree_national_university.pdfIn PDF document text
    • https://s3.amazonaws.com/wukevirenesu/how_long_can_a_homeless_person_survive.pdfIn PDF document text
    • https://s3.amazonaws.com/xalexojaxipud/worship_chord_progressions_piano.pdfIn PDF document text
    • https://s3.amazonaws.com/neviwove/polaris_xplorer_400_2_stroke_for_sale.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_off0000ca1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA1B 5240 bytes
SHA-256: 41758e869cfff1e984183e614822afff4a929904f07c367b677c4b5907b35a1d
font_01_sfnt_off0000dc09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC09 11064 bytes
SHA-256: 036618cb4db2d8043ea174fafd2a2d9869e3328c6c64e2c681c50e6927190c2b

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