Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4772dca88f1e8e4…

MALICIOUS

PDF

74.7 KB Created: 2021-06-04 23:02:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 2d3f7ee3b5385244b0a508adb21c4f07 SHA-1: e2ef319a56f1f7777395ab355fbea67f6c613cdf SHA-256: d4772dca88f1e8e4f8934cbd06c429d0fc56ea10ddb91df415f22503997875ac
134 Risk Score

Malware Insights

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

The PDF contains embedded URLs and heuristics indicate it is a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading malware via a deceptive link. No scripts were extracted, but the presence of external URIs and the overall structure point to a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://coretry.ru/pbw?utm_term=link+download+manga+batch+pdf PDF link annotation
    • https://mevajivikupewog.weebly.com/uploads/1/3/0/7/130775189/tavafonuzoz.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4373304/normal_60aff04a5b710.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4500201/normal_60b6ede1d3ac4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469351/normal_6049ce64aa6c4.pdfIn PDF document text
    • https://rijozixofufake.weebly.com/uploads/1/3/4/5/134509282/0ede1c38e95.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4476275/normal_60aff27b74de4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463809/normal_5ff1b83eaee24.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383918/normal_604d647ae7b0b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486751/normal_5fd94be1b0259.pdfIn PDF document text
    • https://sewogasi.weebly.com/uploads/1/3/1/1/131163712/jidanagudivuxug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403119/normal_60b82c84a08fe.pdfIn PDF document text
    • https://koledino.weebly.com/uploads/1/3/4/3/134332835/somibe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427811/normal_605db78d821c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385228/normal_602be9df3fc46.pdfIn PDF document text
    • https://lusogovo.weebly.com/uploads/1/3/4/3/134358567/bujinemegaje_zopudaxeduzevud_zubomixepifu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376629/normal_5fcf893405ca7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485714/normal_5feb05b02c0bc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://detomipipu.pbworks.com/f/bapufafuvuvuvagife.pdfIn PDF document text
    • http://gediripu.pbworks.com/f/rivasizuboj.pdfIn PDF document text
    • http://wikoborumun.pbworks.com/w/file/fetch/144507273/50543362770.pdfIn PDF document text
    • http://palejemevat.pbworks.com/f/45418194591.pdfIn PDF document text
    • http://kapetipubi.pbworks.com/f/adventure_time_finn_x_huntress_wizard_fanfic.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_off0000de88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE88 5532 bytes
SHA-256: 3e71d8ddfc901679788ae61198f1ef316ef49d03fd6c7d4b3acc192787504fce
font_01_sfnt_off0000f151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF151 15844 bytes
SHA-256: 091b102259ec7eec5409cfd72419e18e35f3c15bddcb87a7e0d2fd2e5f015496

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