Malicious PDF — malware analysis report

Static analysis result for SHA-256 c371cf2fdffb1202…

MALICIOUS

PDF

80.8 KB Created: 2021-04-26 07:06:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c1c5d0d59efa24eca318d18865b686f5 SHA-1: 2dc40a1f565203d76c89ddee9809f16beee8bf61 SHA-256: c371cf2fdffb1202d476412ce719911e5bc4b9276676c94db551c50685d269b2
126 Risk Score

Malware Insights

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

The PDF document was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious intent. It contains numerous embedded URLs, many of which point to disposable domains and are likely part of a link farm designed to redirect users to malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggests a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://midufefew.ru/strik?utm_term=fishman+loudbox+mini+charge+bluetooth+pairing
    • http://suzolovopu.iblogger.org/1987_catalina_30_owners_manual.pdf
    • https://static.s123-cdn-static.com/uploads/4452835/normal_5ffde420e3119.pdf
    • http://pmaider.com/apec_application_form_singapore89h3q.pdf
    • http://boevoenlp.com/nokipoxuziwidofavj97i.pdf
    • http://shoplus.info/outbreak_synonyms_meaning_in_urdud6ibp.pdf
    • http://bioforce-co.site/nigakopokuvekefifap7zf9.pdf
    • http://interbank.link/cisco_packet_tracer_7.1_download_forfxzgz.pdf
    • https://cdn-cms.f-static.net/uploads/4450152/normal_606cc20156b3d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://febuzoremasovev.epizy.com/kunegukemaputigodafakibag.pdf
    • http://fudodub.epizy.com/c_format_string_length.pdf
    • http://witoluteg.epizy.com/pabofoponojav.pdf
    • https://f608bf75-187c-4b28-9621-af925c05c2b6.filesusr.com/ugd/05e3ad_a704faf22bbc48a09ecfbe382811b810.pdf?index=true
    • https://s3.amazonaws.com/lewuli/they_re_groovin_meme_template.pdf
    • https://6a8c3f3f-5248-4e80-80e0-4bf2c04f72bc.filesusr.com/ugd/8b2c09_92dafbc2054b49a3be04ff81f88b2d0e.pdf?index=true
    • https://f499a9ea-5579-4d3c-a180-ba191067f9b7.filesusr.com/ugd/34ec99_ca70c74eabf646fa9386d2b7296ec111.pdf?index=true
    • https://5849b288-062f-49f8-a71b-da420f1f00fd.filesusr.com/ugd/c068f8_95b402aa13a84ebcbbaca0a5e77d65f6.pdf?index=true
    • https://ef733714-782c-48ea-8991-1bc0bf0c95f2.filesusr.com/ugd/ad2ade_5467511ced0a4cb29cd75606cd9fb4fa.pdf?index=true
    • https://s3.amazonaws.com/siwixomudit/game_call_of_duty_2_bagas31.pdf
    • https://e9155d39-0f7d-4366-9ee8-34e17fe3d773.filesusr.com/ugd/9e05b8_f199e703b90347f9af2280303b44be22.pdf?index=true
    • https://5ac9d038-517d-4536-97f6-676423289421.filesusr.com/ugd/b444d4_b20eb755164e4ff3b56252c383d29381.pdf?index=true
    • https://972af30b-04c2-4618-b911-83ba0b7fef9e.filesusr.com/ugd/84a5c6_2992477b1017462ba3a56bdafc5a9540.pdf?index=true
    • https://s3.amazonaws.com/zalomi/73766344277.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eeee.bin
33981ba4cc4dc89386e77d81638b17d5ddef7b09c0ad0ef207bf77af1b3de940		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEE 5652 bytes
font_01_sfnt_off000101ef.bin
fce7a1b37f7de5d87fc5e241e329beef8bdfd3057cb9e0e21939bbd2a3aa3478		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101EF 19972 bytes

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