Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3fd973b77d7a44d…

MALICIOUS

PDF

81.4 KB Created: 2021-03-24 14:53:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 73c35457b073c27faa02559d0c002ccb SHA-1: 26868f593cbe1000a56f179cc95ea47848bc4fab SHA-256: b3fd973b77d7a44d630f86210a6fd47608f82a53421e509ae254256699d6bc3e
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ClamAV as a phishing trojan. The ML classifier also strongly indicates maliciousness. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs that redirect users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=the+hobbit+book+vs+movie+battle+of+five+armies PDF link annotation
    • http://xafesuvorolivig.scienceontheweb.net/dewalt_sliding_compound_miter_saw_12-inch_dws780.pdfIn PDF document text
    • http://goloszauniver.fun/betixebftz3r.pdfIn PDF document text
    • http://xevamaz.iblogger.org/33757875243.pdfIn PDF document text
    • http://yatvoyya.fun/glencoe_algebra_1_answer_key_chapteri570u.pdfIn PDF document text
    • http://bella24.xyz/jobulefirivotq6uyx.pdfIn PDF document text
    • http://fidekeleko.medianewsonline.com/what_is_pellon_made_of.pdfIn PDF document text
    • http://sisogelodaze.medianewsonline.com/makalah_bivalvia.pdfIn PDF document text
    • http://mazers.fun/92187479711swb2z.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nodufezazu.epizy.com/rising_sun_game_rules.pdfIn PDF document text
    • https://8d90b851-447f-4cfc-ac95-1e867b71b983.filesusr.com/ugd/b371d9_2a843fed44f3483a83fcfd485bd011be.pdf?index=trueIn PDF document text
    • http://zapidomaxut.epizy.com/how_to_pair_a_dish_hopper_remote_to_tv.pdfIn PDF document text
    • https://c5e26362-acc3-4c40-9db4-ce0cbd355080.filesusr.com/ugd/681527_34b78806897340c69cd0237eea7f2361.pdf?index=trueIn PDF document text
    • https://e26976e3-f089-44cc-a2a6-54bcc6cae308.filesusr.com/ugd/0df15e_fb3b3b3e98fc478e9bacec972d5f54fa.pdf?index=trueIn PDF document text
    • https://5c839259-519f-4cee-a1a2-6639d654070b.filesusr.com/ugd/140efa_be8b5c45103242ad8509b8f3e23b24c2.pdf?index=trueIn PDF document text
    • http://jujageritoxo.atwebpages.com/causes_of_ischemic_stroke.pdfIn PDF document text
    • http://bozolukiket.epizy.com/satojonikilizuzavanezare.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB21 5220 bytes
SHA-256: ed7046c0d61fa95b86fd374fb547ce40c74e6ab2db029ee6b4e746abd0607312
font_01_sfnt_off0000fcba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBA 11696 bytes
SHA-256: 26baf039982206b2b3664899d6539b2a9dcb4b82b0e70e400c5fffed04255689
font_02_sfnt_off000123c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C8 16036 bytes
SHA-256: ffcc099cb313ee7442755751e66ee5b466d1c2ae3a5aa4db1c7e493352985176

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