Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b201e2f28b35c18…

MALICIOUS

PDF

72.5 KB Created: 2021-03-02 19:04:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 426de345a0bb485b709f0417fdfd837d SHA-1: 30ab7db777c35247e714ae5d415b51f2117e4b7b SHA-256: 9b201e2f28b35c18c29c7595d0f4fa166758fe687e9d02bacee12f1eef61826d
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a lure related to reprogramming a Vizio remote, but its primary function is to act as a link farm. Heuristics indicate a mass of external PDF links, many hosted on disposable domains, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lead users to phishing or malware sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://resalured.ru/award?keyword=how+to+reprogram+a+vizio+remote PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485927/normal_603c34f29fa54.pdfIn PDF document text
    • https://mokoluwi.weebly.com/uploads/1/3/4/5/134595511/9745120.pdfIn PDF document text
    • https://cdn.sqhk.co/siloneza/iaCghjM/78577548712.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470408/normal_5fe40dffe4516.pdfIn PDF document text
    • https://cdn.sqhk.co/kagumuzom/Zjcshfb/kuxozuki.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376088/normal_6000bdd0c03c0.pdfIn PDF document text
    • http://shoop-fe.ru/bittersweet_sarah_ockler366rv.pdfIn PDF document text
    • http://berkeciftci.net/2057234531dsbuk.pdfIn PDF document text
    • https://dawurawo.weebly.com/uploads/1/3/5/3/135323901/64f37591729.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464739/normal_6005e7a9aba81.pdfIn PDF document text
    • https://cdn.sqhk.co/fusexabuvej/6eQjbiw/95231179497.pdfIn PDF document text
    • https://cdn.sqhk.co/pumopivosoba/jMieiil/25925804841.pdfIn PDF document text
    • https://cdn.sqhk.co/kogewole/dofjjal/zombie_attack_roblox_bosses.pdfIn PDF document text
    • https://cdn.sqhk.co/defegitip/6Gyiii6/onedrive_mac_download_on_demand.pdfIn PDF document text
    • https://cdn.sqhk.co/tokarikadez/jfAfiin/82924847207.pdfIn PDF document text
    • https://xuwekakef.weebly.com/uploads/1/3/1/8/131856316/4230300.pdfIn PDF document text
    • http://letgtma.bid/xovodakaxa6ilnj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE020 5092 bytes
SHA-256: d84f3df13bc4fee84444ba507aa6e469589836cb78ff317b5afeaa3ec6a0c268
font_01_sfnt_off0000f180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF180 10352 bytes
SHA-256: e2c22a2c9f38597d34f13d9c9135081dfee53bc82edd152b7ee9adc41502357a

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