Malicious PDF — malware analysis report

Static analysis result for SHA-256 545e0854ad2f1fbb…

MALICIOUS

PDF

82.2 KB Created: 2021-04-27 23:59:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: ce0274fc23de184a0dab660a2dcaa850 SHA-1: 936b0a80d99ddff3c8c43f110867b8e573fafbe6 SHA-256: 545e0854ad2f1fbbf1fb147001a0bd882a75b9d0a9d802150a67aa81dbf4344e
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to potentially harmful content.

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://kuzutuzo.ru/strik?utm_term=what+is+the+significance+of+the+title+name+j+alfred+prufrock PDF link annotation
    • http://tixshopclub.fun/watch_dogs_bad_blood_trophy_guidewymu7.pdfIn PDF document text
    • https://zakoponuzu.weebly.com/uploads/1/3/5/9/135992890/6815923.pdfIn PDF document text
    • https://tezubowaxax.weebly.com/uploads/1/3/4/6/134640868/jomojepazuwumano.pdfIn PDF document text
    • https://fipekonekuz.weebly.com/uploads/1/3/4/7/134742334/rimowosakebusigemes.pdfIn PDF document text
    • https://lomoludogakure.weebly.com/uploads/1/3/4/3/134364850/luratutarex_zuwuxi_rijaf_bixunejaz.pdfIn PDF document text
    • https://vamarimorojikav.weebly.com/uploads/1/3/4/6/134640123/68d93f.pdfIn PDF document text
    • http://world-wild-shop.com/ccna_routing_and_switching_study_guideegmtq.pdfIn PDF document text
    • http://azules.ru/829008882416iy4p.pdfIn PDF document text
    • http://lnstagramsupportinfo.com/i_am_lost_meme_songauddo.pdfIn PDF document text
    • https://penizamuravepu.weebly.com/uploads/1/3/5/9/135976181/3026236.pdfIn PDF document text
    • https://nagejezesalu.weebly.com/uploads/1/3/0/8/130874580/2125849.pdfIn PDF document text
    • http://mscgis.net/stairway_to_heaven_tab_solo_songsterrap76i.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/fevobelijogal/60655931461.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07eebc12-a0d1-4395-b2fb-66a58e43d8b7/what_period_is_vanity_fair_set_in.pdfIn PDF document text
    • https://6d4a8fb0-9a8a-4850-8aa1-2b5706121c9a.filesusr.com/ugd/ff2e72_37206c05341d4d44abc2acf83b2188d8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba76687a-65dc-4c9c-a8ce-97eb95d6e989/how_often_questions_exercises.pdfIn PDF document text
    • https://s3.amazonaws.com/mokixetat/free_esl_worksheets_for_adults.pdfIn PDF document text
    • https://s3.amazonaws.com/wejuvono/novela_batallas_en_el_desierto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c5b4a76-c0b5-4ab7-9a58-c1aa4593c54f/23366672607.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8e8a701-548a-466b-b592-2fa02e41a3e6/froggers_adventures_temple_of_the_frog_gba_rom.pdfIn PDF document text
    • https://s3.amazonaws.com/rudelazifizuvo/bilufelevabene.pdfIn PDF document text
    • https://9dc8676a-0e58-44ee-a512-e339c7094702.filesusr.com/ugd/7c0652_144985b42d984a1d9002771bd4009cdb.pdf?index=trueIn PDF document text
    • https://f5f74d4f-f804-4d9b-9bfa-9964b2756261.filesusr.com/ugd/e389b3_7b8389fba50c4c79aa8ddc9dd5e009ab.pdf?index=trueIn PDF document text
    • http://www.bartleby.com/198/1.htmlIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A5 5604 bytes
SHA-256: 4feed989c89ca3137cf7e0f7120e8eace0b651d7051367de94904e0b49012d59
font_01_sfnt_off00010895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10895 10552 bytes
SHA-256: e4b0cb0e81229458fc776c000d8baf5fd95ef799e376a4681041d34ba1c9c6da
font_02_sfnt_off00012cba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CBA 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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