Malicious PDF — malware analysis report

Static analysis result for SHA-256 68549500c6160005…

MALICIOUS

PDF

70.2 KB Created: 2021-10-01 18:13:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f22fd7e5ece0b6b6d0661be5c6f05ca7 SHA-1: 65e7b343ec01d6efcb47e47f92e49de8e34df22a SHA-256: 68549500c616000568154982ef661a70b0f89ff1cbac14610b497ae59deaa749
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm on disposable hosting. The embedded URLs, such as 'https://ketchas.ru/uplcv?utm_term=battlefield+v+mobile+apk', suggest a phishing or malware distribution attempt by masquerading as a software download. No scripts were extracted, but the PDF structure and numerous external links point towards a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://ketchas.ru/uplcv?utm_term=battlefield+v+mobile+apk PDF link annotation
    • https://refakatci.net/userfiles/file/nefuzimigifodikipumu.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/xemazeramadidilixivapu.pdfIn PDF document text
    • http://isotech.si/uporabnik/file/23416131570.pdfIn PDF document text
    • http://dakov.hu/_user/file/gopulegom.pdfIn PDF document text
    • https://kaparatt.com/images/File/zejozufivafejefewil.pdfIn PDF document text
    • https://taipeitccia.org/CKEdit/upload/files/79014345390.pdfIn PDF document text
    • http://poliambulatorioargentina.eu/userfiles/files/51081685432.pdfIn PDF document text
    • https://kalitelivideoizle.com/resimler/files/30050909092.pdfIn PDF document text
    • http://ccadl.com/files/20210927024921.pdfIn PDF document text
    • http://mobilahomedesign.com/userfiles/files/kazusosolasoke.pdfIn PDF document text
    • https://nhuadailoan.vn/upload/userfiles/files/28907449154.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/57050326237.pdfIn PDF document text
    • http://elma1.ru/!upload/files/14446025704.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/nonujes.pdfIn PDF document text
    • http://funkyspa.net/ckfinder/userfiles/files/mujomaluvojiwon.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/doxorozoxezomizojarid.pdfIn PDF document text
    • http://nataliashishkina.com/userfiles/file/wutemub.pdfIn PDF document text
    • https://butchercurnow.com/img/shop/contents/gowujugabudojaterijetub.pdfIn PDF document text
    • https://nevjegyzek.eu/uploads/file/41739000626.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/75972156720.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/misekipavanonegetare.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/zolepubowobekivabegujutem.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/bisajokutisiro.pdfIn PDF document text
    • http://musiclivemarsala.com/userfiles/files/64697964769.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB181 10640 bytes
SHA-256: b1ed9d9de96adc27a95e222c24693a193dc4d19b455d8aa59f7c055480c364b1
font_01_sfnt_off0000c9a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A9 15652 bytes
SHA-256: ab8d72194b2c2028d4818ca607379addc35fcd4b1a73e9e112c5c0a5819fc69d
font_02_sfnt_off0000f18e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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