Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7bc41346f8e74c6…

MALICIOUS

PDF

86.8 KB Created: 2021-03-23 17:20:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 4968529d873b0f245ced5f3e1a443abb SHA-1: ece277752f4a903729073b523307a7bb8cf8ed14 SHA-256: f7bc41346f8e74c6dcd6aec3f7b0f13eccc49b2da6fa34968d33743fe5462898
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, indicating a likely attempt to redirect users to malicious content. Although no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggest it is designed to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://botokaw.ru/123?utm_term=yellowstone+show+parental+guide PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4377662/normal_5feb49fcea2c0.pdfIn PDF document text
    • https://cdn.sqhk.co/xonipavu/gfAhe3C/senate_election_results_election2020_live.pdfIn PDF document text
    • http://alcexpress3.xyz/fedalemebavijoxorubarexiwpcsv9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414153/normal_5fcf313e5374a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389084/normal_600bf9cf02b53.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369486/normal_600a8192a973c.pdfIn PDF document text
    • https://cdn.sqhk.co/gorokipo/hdzjdbc/79727547379.pdfIn PDF document text
    • https://cdn.sqhk.co/tabuguran/Lhi9qje/bird_paradise_flower_drawing.pdfIn PDF document text
    • http://iranianvc.com/coding_for_beginners_youtuberdtjd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483331/normal_5fd7d03b7e8a7.pdfIn PDF document text
    • http://my-favshopf.online/9545138551zqqt1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486036/normal_5fe812369460d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382953/normal_603e277811531.pdfIn PDF document text
    • https://cdn.sqhk.co/fodumisux/Bggpjc1/vugimirosodedipawo.pdfIn PDF document text
    • https://cdn.sqhk.co/berirenike/ggXwyZX/shooters_world_powder_distributors.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471711/normal_6023dca980049.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454425/normal_604d1b0ebbf83.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505820/normal_601faeae209d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421627/normal_60121a0d8c5b0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zilekej.epizy.com/periodontics_carranza_free.pdfIn PDF document text
    • http://luwawabegopit.rf.gd/appcelerator_android_sdk_not_found.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_off00011413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11413 5272 bytes
SHA-256: b96877744e88c32aba22c05a22df813cbc29eaef74aed644bb5ffbfa1b32a12d
font_01_sfnt_off0001260e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1260E 11076 bytes
SHA-256: 32d58aa2724d08eed5c35547e683376a17adb5c0b5deb19fe2246640e488589a

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