Malicious PDF — malware analysis report

Static analysis result for SHA-256 58c875780931d558…

MALICIOUS

PDF

79.7 KB Created: 2021-02-21 14:49:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 60f6488083bc19bf9447ac4799a6d0ff SHA-1: 05a0bb56dbccfd6d9223e72cda268a9980c4a846 SHA-256: 58c875780931d5581e13743e0403ff970cdaa885f5a8aa56d55baf25ecf528eb
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 embedded URLs pointing to disposable domains and link farms, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content, likely as part of a phishing campaign.

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://jacksth.ru/strik?utm_term=womens+long+to+short+haircut+stories PDF link annotation
    • http://wozonos.22web.org/see_beneath_your_beautiful_piano_sheet_music.pdfIn PDF document text
    • http://xazusifiwo.iblogger.org/is_cricut_expression_compatible_with_design_space.pdfIn PDF document text
    • https://cdn.sqhk.co/wepigosogo/iy6yhe0/marvel_legendary_secret_wars_2_card_list.pdfIn PDF document text
    • https://cdn.sqhk.co/tetaxekumipi/2iiifge/divarication_of_rectus_abdominis_muscles_dram_postpartum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491665/normal_6025e15710ee3.pdfIn PDF document text
    • https://cdn.sqhk.co/kulobuwaxegu/hcsjbAh/tomb_raider_movie_2018_budget.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464327/normal_5fd3daa42b586.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426697/normal_602b088cc74bb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459321/normal_6002725e26676.pdfIn PDF document text
    • https://cdn.sqhk.co/penutizufib/eiSjd9u/interstellar_2_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/fukonovum/dg8PFr5/kulumuf.pdfIn PDF document text
    • https://cdn.sqhk.co/rorajakura/hhggjjd/rutidatomilaxogugusamu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fopagozijudiri.epizy.com/convection_oven_cookie_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/wujodibu/abhimaan_movie_song_bengali.pdfIn PDF document text
    • https://s3.amazonaws.com/vofadoloves/dividing_polynomials_using_synthetic_division_worksheet.pdfIn PDF document text
    • http://naxezutozotos.rf.gd/67578446615.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_off0000fbd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD0 5228 bytes
SHA-256: fc6c1562824390b391c3875ee2b380b2168e82711f61c43e25cddfe7bf460895
font_01_sfnt_off00010d72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D72 10836 bytes
SHA-256: 66af01b061e9c9b6915c7099aae9761d7f96f2f5000249529f7df41ddbcf6e1a

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