Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d42d2f7f186907f…

MALICIOUS

PDF

86.2 KB Created: 2021-03-25 02:12:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5794413a563f7683c488f4e0f1fbc876 SHA-1: 35623e453c2b7c2542bd6adbd9d654189bb74e76 SHA-256: 1d42d2f7f186907fe80536557f55c177007188ad0efbf49dfcd08272b9930146
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, indicative of a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://zajinet.ru/strik?utm_term=que+significa+canalizacion+espiritual
    • https://bekariniwoxisit.weebly.com/uploads/1/3/2/7/132710774/1763723.pdf
    • https://lifalaril.weebly.com/uploads/1/3/4/8/134883644/b503563a955a73.pdf
    • http://wegoluxetas.scienceontheweb.net/2010_chrysler_town_and_country_tpms_reset.pdf
    • https://mufebomilizupa.weebly.com/uploads/1/3/4/6/134608191/1743382.pdf
    • https://static.s123-cdn-static.com/uploads/4374021/normal_6006dafa9e402.pdf
    • http://godotobekof.scienceontheweb.net/80398130199.pdf
    • https://vemetufubejukat.weebly.com/uploads/1/3/4/3/134367776/1934259.pdf
    • http://xovebud.mygamesonline.org/ammonium_persulfate_msds.pdf
    • https://fuvuliles.weebly.com/uploads/1/3/4/9/134904701/wegipebijebamomiruru.pdf
    • https://cdn-cms.f-static.net/uploads/4427313/normal_6037e6ee6f026.pdf
    • https://wovufimi.weebly.com/uploads/1/3/5/3/135327312/5027683.pdf
    • https://zeraxoxuret.weebly.com/uploads/1/3/4/6/134642117/mumubagi.pdf
    • https://static.s123-cdn-static.com/uploads/4426701/normal_5ff5ebf178410.pdf
    • http://falorilipeb.mywebcommunity.org/89716963210.pdf
    • https://cdn-cms.f-static.net/uploads/4450511/normal_6024ef982df3f.pdf
    • https://xuvelufuxilo.weebly.com/uploads/1/3/5/3/135387868/fimelogevulav.pdf
    • https://jadilibetaz.weebly.com/uploads/1/3/4/8/134871175/f2f053b1ae9.pdf
    • https://dolafodapeke.weebly.com/uploads/1/3/4/7/134705679/2948230.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/2cca3017-7e08-42ca-bc38-9b2e163c385a/4377906820.pdf
    • http://zodiripek.myartsonline.com/how_to_keyword_search_on_ipad.pdf
    • https://uploads.strikinglycdn.com/files/3ff7cb82-4437-4eb0-806b-a90a5176e9bf/4th_grade_math_review_test.pdf
    • http://xiwozoget.atwebpages.com/89810244558.pdf
    • http://tigagatu.atwebpages.com/kung_fu_panda_cast_2.pdf
    • https://uploads.strikinglycdn.com/files/1de0dce2-8cea-46ce-a104-a3a8c56b7e2c/best_biography_books_of_albert_einstein.pdf
    • http://durenifujogax.myartsonline.com/types_of_mental_disorders.pdf
    • http://solugivewatewa.myartsonline.com/6799426082.pdf
    • http://ziwivazud.onlinewebshop.net/vinylmaster_pro_4_crack.pdf
    • https://uploads.strikinglycdn.com/files/c98f8d7b-4041-455d-a8f8-9746f68f711c/33430788085.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_off00011010.bin
14712bb4c3d35bc3f7ac0cf65c11b1664f048baa58e2d5f7e9edfa2c1ee3532b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11010 5292 bytes
font_01_sfnt_off00012231.bin
f4d9029517e751b794da494f1839418ebb5b261331efe51c0fdbcdcec67289f2
pdf-font-stream PDF embedded font (sfnt) at offset 0x12231 12084 bytes