Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf2f5ff7b0e63c24…

MALICIOUS

PDF

85.7 KB Created: 2021-03-20 11:36:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 9689f15b43db702179cec85110d95838 SHA-1: 5734219303bacd564092815877c3aa4ecf185d3a SHA-256: cf2f5ff7b0e63c2401f827bc41de9ced2204d3519973bb8afa2f0a53ca9b5fec
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm containing numerous external links to other PDFs, many hosted on disposable domains. The ML classifier and ClamAV also identified it as malicious. While no scripts were directly extracted, the structure and URL patterns suggest it's designed to redirect users to potentially malicious content, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/award?keyword=argumentative+speech+examples+pdf PDF link annotation
    • https://cdn.sqhk.co/josedinis/fhagegg/rey_skywalker_yellow_lightsaber_toy.pdfIn PDF document text
    • https://cdn.sqhk.co/fajixojemom/hh74him/miwawukafuwofakapotorux.pdfIn PDF document text
    • https://puwoposujol.weebly.com/uploads/1/3/0/9/130969317/kibugobelaw_jaweloregifoxu_sowip_ragudesazu.pdfIn PDF document text
    • https://cdn.sqhk.co/dukosisevu/DngeJja/within_temptation_what_have_you_done_wiki.pdfIn PDF document text
    • https://cdn.sqhk.co/wexunaveb/Xiahgjb/96511871262.pdfIn PDF document text
    • https://joxunirefebemi.weebly.com/uploads/1/3/4/3/134319414/3a2eee3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369328/normal_5fded0aee8fce.pdfIn PDF document text
    • https://cdn.sqhk.co/tujarazimok/iU2jhUk/fake_gps_location_gps_joystick_4._0._6.pdfIn PDF document text
    • https://zajoralesame.weebly.com/uploads/1/3/0/9/130969459/1865404.pdfIn PDF document text
    • https://jipoditewiwes.weebly.com/uploads/1/3/4/8/134875435/zabinupeme-vuboguvope-desomifoviki.pdfIn PDF document text
    • https://cdn.sqhk.co/gujowaxexag/HnjfgJs/luxor_deluxe_game.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414360/normal_601670b59ff6d.pdfIn PDF document text
    • https://cdn.sqhk.co/dagosasojo/Md0Shif/fox_racing_motorcycle_helmets.pdfIn PDF document text
    • https://pudeputuxokaj.weebly.com/uploads/1/3/5/9/135968230/4693483.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389603/normal_6005a015e965a.pdfIn PDF document text
    • https://cdn.sqhk.co/dawiredi/eNeRida/duruwexiv.pdfIn PDF document text
    • https://cdn.sqhk.co/namulofilox/hiaif5r/45833024872.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/rudelazifizuvo/information_asymmetry_company_examples.pdfIn PDF document text
    • https://s3.amazonaws.com/kotodur/how_much_do_head_cashiers_at_lowes_make.pdfIn PDF document text
    • https://s3.amazonaws.com/wazagidonux/zadunalatokovejajazan.pdfIn PDF document text
    • https://s3.amazonaws.com/zagubip/ruleb.pdfIn PDF document text
    • https://s3.amazonaws.com/xuxifuzituwu/89271145334.pdfIn PDF document text
    • https://s3.amazonaws.com/watajive/suxapigilokedax.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_off0000fafc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFC 5684 bytes
SHA-256: 678eecde7a5f37adde95a4d4c359a9bcd8f0fe1875a05737e98e2322244c15e0
font_01_sfnt_off00010e38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E38 10984 bytes
SHA-256: f9be25212dba2a69b8d074cb8d526823df23760ee6b15fdfd05cae6f1f5b005f
font_02_sfnt_off000133a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133A8 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd