Malicious PDF — malware analysis report

Static analysis result for SHA-256 47a9dcf54fb27e28…

MALICIOUS

PDF

78.1 KB Created: 2021-04-30 06:52:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 6d89f37f6b377e2163f969e6261f051a SHA-1: b2101af345dc6bfc44065c724f1f528d7c47fd65 SHA-256: 47a9dcf54fb27e288190c99bc0f30ea6a8e53e27cf19af283a83c3cf22547904
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 pointing to disposable domains, indicating a link farm designed to distribute malicious content or conduct phishing. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded URLs and the heuristic firings related to SEO link farms point towards an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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 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://mezovuduw.ru/strik?utm_term=vgli+control+number PDF link annotation
    • http://onlinetyz.xyz/52663361641q93dh.pdfIn PDF document text
    • https://cdn.sqhk.co/pogadidotilu/ihDqmgf/fire_boy_water_girl_light_temple_miniclip.pdfIn PDF document text
    • http://rujisuki.mygamesonline.org/cessna_172_maintenance_manual_download.pdfIn PDF document text
    • https://bokosemebejira.weebly.com/uploads/1/3/0/8/130813317/muzusenopatije-fujejoxuno.pdfIn PDF document text
    • http://kavelokafozi.medianewsonline.com/why_is_it_called_tropic_of_cancer_and_capricorn.pdfIn PDF document text
    • https://tovamegudisolos.weebly.com/uploads/1/3/1/4/131411857/93c9ed.pdfIn PDF document text
    • https://vogaxuruxav.weebly.com/uploads/1/3/4/3/134352923/4216200.pdfIn PDF document text
    • http://susekilimu.medianewsonline.com/acetylated_starch.pdfIn PDF document text
    • http://instasurprise.online/how_to_get_rid_of_poison_ivy_rash_fast_bleachu2f9h.pdfIn PDF document text
    • https://belukuxar.weebly.com/uploads/1/3/5/3/135312366/wurowogepivane-balezalof.pdfIn PDF document text
    • https://veranaza.weebly.com/uploads/1/3/4/6/134665567/3fbe98ae440c07.pdfIn PDF document text
    • https://cdn.sqhk.co/nelenikarate/hiaiaja/4294857947.pdfIn PDF document text
    • https://nibevomixosu.weebly.com/uploads/1/3/4/1/134108547/worexepu_loduvipezanuru.pdfIn PDF document text
    • https://dakewamegiru.weebly.com/uploads/1/3/5/3/135305658/nijepak_susiraforepa_paxupodonunip.pdfIn PDF document text
    • http://inostrana.com/what_happened_to_the_baudelaires_after_the_end_netflixm8yy9.pdfIn PDF document text
    • https://pafovawulawagi.weebly.com/uploads/1/3/4/5/134581771/datekejubara.pdfIn PDF document text
    • https://cdn.sqhk.co/wenewojufaj/jff1eAS/masojefozaraza.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/CsqibHb/duzibadufefubonatamarukez.pdfIn PDF document text
    • https://dodikajopofibu.weebly.com/uploads/1/3/4/7/134704264/ee1f77012615.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6eed613e-cbae-405e-b458-9655ef9033f8.filesusr.com/ugd/e4f6f0_f9d9e58b0d724796ad8ac7bfa2789857.pdf?index=trueIn PDF document text
    • https://73856814-13bb-4d44-aeaf-752cce6ba6bd.filesusr.com/ugd/a0d21a_c1cccc98f8cd46b0971a76e42d9cc5c7.pdf?index=trueIn PDF document text
    • https://c7fb3737-a2fb-4e06-b71d-f78b648bb0a4.filesusr.com/ugd/a9248e_a8c9d71298eb4f2bbc9be4e44ec6e20e.pdf?index=trueIn PDF document text
    • https://c6506652-bf5e-4f52-be36-03dbfaede22c.filesusr.com/ugd/f74919_696e2ef29a1d4829b2d9435232ee253d.pdf?index=trueIn PDF document text
    • http://nokejufesuw.atwebpages.com/business_productivity.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f62e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62E 4836 bytes
SHA-256: 03e1581dbb384e2f04868073f33778c116dd6bcf75b8a48f0984fddb0b4adc98
font_01_sfnt_off00010697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10697 10748 bytes
SHA-256: 85bcf7b1c64a4155bcf43b4941463832ab9f06d50635e92d8080a72d483d0550