Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcf67443eeb5fcad…

MALICIOUS

PDF

77.9 KB Created: 2021-09-17 07:46:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8a89e49883fd82739f84e8bca3228d8d SHA-1: 6412b24b825805a4762a4df301b843d7729a54ee SHA-256: bcf67443eeb5fcad1587565f0a263c0861c7b116683c1d81771718f996989ec8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of numerous external URLs, many pointing to PDF files hosted on disposable domains, suggests a phishing or malware distribution campaign. ClamAV detection and ML classification strongly indicate malicious intent, likely involving the exploitation of PDF vulnerabilities to execute code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://laborke.ru/uplcv?utm_term=is+android+battery+better+than+iphone PDF link annotation
    • http://krr-nfe.com/suratnfe/UserFiles/File/fabelaruladowuragojopu.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/re056odfretc8m1q3qmpg8cavc/fifatoko.pdfIn PDF document text
    • http://citysoupsbellevue.com/uploads/files/rikalosebixebirotenonis.pdfIn PDF document text
    • http://cardealer-space.com/js/upload/files/1456719374.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/76665875080.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/13139281399.pdfIn PDF document text
    • https://novitas.ro/files/zaduno.pdfIn PDF document text
    • http://elliptical-trainers.ru/ckfinder/userfiles/files/74667452892.pdfIn PDF document text
    • https://sankaibearing.com/userfiles/files/69479517979.pdfIn PDF document text
    • http://funagamex.vn/PhuongNamGroup/userfiles/files/32626869421.pdfIn PDF document text
    • http://tianlanlawyer.com/filespath/files/20210904140331.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/20910882476.pdfIn PDF document text
    • http://xn--spreewaldpension-lbben-9lc.de/meineBilderAlbertGrundschule/file/repali.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/12529146684.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143bd3e3d6e5---gatosudun.pdfIn PDF document text
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/koxafalojepuw.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/nosotiwepokazezutisatud.pdfIn PDF document text
    • http://blgjad.com/upload/files/82084250541.pdfIn PDF document text
    • https://guptajimarriagebureau.com/userfiles/file/negari.pdfIn PDF document text
    • https://www.db-ynox.fr/ckfinder/userfiles/files/66217991581.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/94959147292.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/xawata.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_off0000cc58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e46f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE46F 10648 bytes
SHA-256: e34a8c69fdd9d9755fc6eb71bd5fdad65d8043e6f94da4a7ebd3763fe7e91d63
font_02_sfnt_off0000fc86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC86 17524 bytes
SHA-256: 93d1fa955c13eb142c785587aca8b70dc914ef2d088eda32f3fc39940032d212

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