Malicious PDF — malware analysis report

Static analysis result for SHA-256 7313f8c51caef284…

MALICIOUS

PDF

93.5 KB Created: 2021-06-09 07:59:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 732c1fe6058225302aaebbb5078113b1 SHA-1: 536c6b2905ef11568ab153bae1f0142569f640b8 SHA-256: 7313f8c51caef2845a443d2876586b2ca7b5726dde1640be7115c9ea80571183
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, many hosted on disposable domains, suggesting a link farm designed to direct users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were extracted, the structure and URL patterns are consistent with a lure to download further malicious content.

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://wastran.ru/pbw?utm_term=numerical+methods+for+engineers+6th+edition+solution+manual+pdf+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4405925/normal_606a51cad797a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460241/normal_606b7ca33b833.pdfIn PDF document text
    • https://velineninebag.weebly.com/uploads/1/3/4/6/134608195/2c9bd14c538baeb.pdfIn PDF document text
    • https://vipagazowarofi.weebly.com/uploads/1/3/4/6/134685611/44273e.pdfIn PDF document text
    • https://kuxevirajopar.weebly.com/uploads/1/3/5/9/135990570/davawijot_zaporisajolulej_wuxizapup.pdfIn PDF document text
    • https://zomuguwiremadak.weebly.com/uploads/1/3/1/4/131406071/6c79857cb.pdfIn PDF document text
    • https://ninujesifig.weebly.com/uploads/1/3/1/4/131453022/busewidedibu.pdfIn PDF document text
    • https://kukitarigawe.weebly.com/uploads/1/3/0/7/130776277/5e8c079.pdfIn PDF document text
    • https://fitabidik.weebly.com/uploads/1/3/0/7/130776693/bivoran.pdfIn PDF document text
    • https://zegikawa.weebly.com/uploads/1/3/4/6/134640481/4321869.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374682/normal_60673def500a9.pdfIn PDF document text
    • https://toxodapakaxoza.weebly.com/uploads/1/3/4/5/134525452/4e8a15db30a2e68.pdfIn PDF document text
    • https://zikosijuwuxaben.weebly.com/uploads/1/3/7/5/137513753/vogup-bisazava-wijeturaworopab.pdfIn PDF document text
    • https://towizitubozabo.weebly.com/uploads/1/3/5/4/135400713/5752333.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378157/normal_6041205fa329d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mitamugukojo.pbworks.com/f/tom_m_apostol_calculus_volume_1.pdfIn PDF document text
    • http://siwuromo.pbworks.com/w/file/fetch/144425325/how_to_write_air_pollution_in_korean.pdfIn PDF document text
    • http://deduxofevit.pbworks.com/f/nuluverikeduvawetufevuxi.pdfIn PDF document text
    • http://javefanudosa.pbworks.com/f/warrior_cat_names_for_golden_toms.pdfIn PDF document text
    • http://dajodovilav.pbworks.com/f/tesobemumibeves.pdfIn PDF document text
    • http://voveras.pbworks.com/f/vorixikakubenijujazuma.pdfIn PDF document text
    • http://fuvesiwowegu.pbworks.com/f/supax.pdfIn PDF document text
    • http://zizojeza.pbworks.com/w/file/fetch/144844077/96282220157.pdfIn PDF document text
    • http://beratirupo.pbworks.com/f/xaxosa.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_off00012b23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B23 5784 bytes
SHA-256: 1d1b7bdcbbf295e28e8813fac8c00af4d6c2512866af834f1e41326466117d87
font_01_sfnt_off00013ebb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EBB 12520 bytes
SHA-256: ccb47dab13d128f7f15d1118786baf730c4b284dd7baee5476b6725408868ea7