Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb16191d57e90d05…

MALICIOUS

PDF

75.9 KB Created: 2021-06-13 21:24:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: fc81bfe857da5139f8b85da09417d698 SHA-1: 80df1e8dbbe8e81e9e9b10165352e98f02dd567b SHA-256: cb16191d57e90d05e2829ab86ff181b57807d5ca735644ce894a077d14e39330
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. One of the embedded URLs, 'https://wastran.ru/pbw?utm_term=gta+visa+2+mod+download', appears to be a lure for downloading potentially unwanted software. No scripts were extracted, but the presence of numerous external links points towards a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=gta+visa+2+mod+download PDF link annotation
    • https://dumiwexadanona.weebly.com/uploads/1/3/4/5/134522913/5642490.pdfIn PDF document text
    • https://kusebavizekofuk.weebly.com/uploads/1/3/4/0/134098677/9317954.pdfIn PDF document text
    • https://nirotagikul.weebly.com/uploads/1/3/5/9/135992947/puvukasi-puvimi-giratuxafuxor-petukomo.pdfIn PDF document text
    • https://mepodatadun.weebly.com/uploads/1/3/1/4/131452799/wedim-letola.pdfIn PDF document text
    • https://lakofanagobogan.weebly.com/uploads/1/3/5/3/135386994/jopubefuvepoja_mazogifimovij.pdfIn PDF document text
    • https://runumoviw.weebly.com/uploads/1/3/4/8/134854062/xotexu_sazivojamuka_waxevap.pdfIn PDF document text
    • https://xumizobizuzu.weebly.com/uploads/1/3/4/6/134688834/3556642.pdfIn PDF document text
    • https://dotawipe.weebly.com/uploads/1/3/5/3/135323210/e5e9348fdb62.pdfIn PDF document text
    • https://dufibivi.weebly.com/uploads/1/3/5/3/135346242/1004583.pdfIn PDF document text
    • https://mozozorez.weebly.com/uploads/1/3/5/3/135343695/796730.pdfIn PDF document text
    • https://fumunavizagoz.weebly.com/uploads/1/3/4/2/134235019/1639856.pdfIn PDF document text
    • https://dubuweni.weebly.com/uploads/1/3/1/6/131637072/doxumegokekutuve.pdfIn PDF document text
    • https://gatodagimisosog.weebly.com/uploads/1/3/1/3/131379801/2142578.pdfIn PDF document text
    • https://wigeludob.weebly.com/uploads/1/3/1/6/131636858/9ca24279ae.pdfIn PDF document text
    • https://vunojomilubokub.weebly.com/uploads/1/3/0/7/130775688/8f68b9b4.pdfIn PDF document text
    • https://duturakesubepa.weebly.com/uploads/1/3/4/7/134703065/1032925.pdfIn PDF document text
    • https://jojixisobimat.weebly.com/uploads/1/3/4/7/134771177/17dc48a6842d1a0.pdfIn PDF document text
    • https://mopobaseburole.weebly.com/uploads/1/3/4/8/134859053/digexagozoxofuw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ad53e24-4d4a-40df-922d-aeb0995c6d44/panozafidiniparadonidar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4efaf0fd-7c1e-41f5-ab6d-ac81314c6a25/99687219344.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90133ca6-24fd-457e-a683-7e59050f937e/19212912339.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_off0000dc17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC17 5192 bytes
SHA-256: 0e14107af3dbae24d958f4fbbbd0e552cdb99aa89673c1a3c7be930fc011afbd
font_01_sfnt_off0000edcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCF 16092 bytes
SHA-256: 043bc95f4d4820b7f469e4f17f05c2b6259fb991fa176d5a812d98ae51fa2717