Malicious PDF — malware analysis report

Static analysis result for SHA-256 75cb05d8d14207bb…

MALICIOUS

PDF

84.2 KB Created: 2021-03-11 10:49:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d59e752c80f9863a94ab867099ededb SHA-1: d6a447eb4ee817c04556b492a7fe54679f50b3f0 SHA-256: 75cb05d8d14207bbbe433fa1859e88a5db92f84dbf7e4ca1530ed8afc3963753
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, indicating it functions as a link farm. Several heuristics, including 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM', confirm this behavior, suggesting the document is designed to manipulate search engine results or distribute content from these linked sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via the linked PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://resalured.ru/award?keyword=configuration+asterisk+sous+ubuntu+pdf
    • http://nemosixumeki.mypressonline.com/a_first_course_in_abstract_algebra_3rd_edition_solutions.pdf
    • https://vunisanege.weebly.com/uploads/1/3/0/8/130813420/narezofa_zaxano_piloj.pdf
    • https://doxorovovo.weebly.com/uploads/1/3/4/4/134479089/lipevawovofovasoril.pdf
    • http://xufamorazogubov.sportsontheweb.net/linovirufutos.pdf
    • https://kuwovuvonix.weebly.com/uploads/1/3/5/9/135971109/dafevovonunofapekona.pdf
    • https://cdn-cms.f-static.net/uploads/4484641/normal_6039fa3b2da6b.pdf
    • https://cdn-cms.f-static.net/uploads/4412897/normal_6027d999e61ff.pdf
    • https://cdn.sqhk.co/tuwesedujila/eWcBjbg/soda_dungeon_2_chef.pdf
    • https://dodarumobite.weebly.com/uploads/1/3/1/4/131437296/gerobuxudos.pdf
    • https://juvedolukojubis.weebly.com/uploads/1/3/2/6/132682904/1531435.pdf
    • https://nefawuwezogixo.weebly.com/uploads/1/3/1/1/131163734/6441701.pdf
    • https://cdn.sqhk.co/wejafivelij/UidhXqt/lirarurokag.pdf
    • https://bofipafora.weebly.com/uploads/1/3/0/7/130776763/faedde9a.pdf
    • https://taduravepe.weebly.com/uploads/1/3/4/7/134714340/0479d0052ca2.pdf
    • https://zetidikusas.weebly.com/uploads/1/3/4/7/134740093/peditafedonikoxugida.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/xoguwavosuje/tatasok.pdf
    • https://s3.amazonaws.com/sinamozagemoger/xitawake.pdf
    • http://zevesijuduma.atwebpages.com/battleship_game_board.pdf
    • http://muzulozak.atwebpages.com/pyxis_medstation_3500_specifications.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd8f.bin
f61630d989451e05433fa66950bdf8f3fa494ada4ffe0df25e7c1d30055e686d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8F 5288 bytes
font_01_sfnt_off00010f95.bin
62f416b17674509656698a897032b8ef8c61fa0054c90b305e4b3994a3e7a642		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F95 10892 bytes
font_02_sfnt_off000134e3.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x134E3 4324 bytes

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