Malicious PDF — malware analysis report

Static analysis result for SHA-256 34057460c346e40f…

MALICIOUS

PDF

72.2 KB Created: 2021-09-15 14:42:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d656d223a89c4243336d76f5779c9807 SHA-1: dc84947443e51fd3bfc34eb35d711c4a298efdea SHA-256: 34057460c346e40f95e3297531fff5552556e53e10f33649f81236063eeb652d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://wastran.ru/uplcv?utm_term=manufacturing+consent+noam+chomsky+pdf+free+download
    • http://www.polni.si/Images/files/sejafiwoxawiro.pdf
    • http://eyupsifalibitkiler.com/resimler/files/68588640912.pdf
    • https://network-italia.it/file/94433283612.pdf
    • http://fabriziocar.it/userfiles/files/94558638292.pdf
    • https://harshahometutors.com/uniformkontakt/userfiles/image/files/12567113192.pdf
    • http://mastervin.ru/files/file/jibimatomadotarolajijune.pdf
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/73064811392.pdf
    • http://energo-winstal.pl/userfiles/file/rawapide.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/a119b7a0416e2ca1834b125f0f803af4/babanu.pdf
    • https://lidiyageorgieva.com/ckfinder/userfiles/files/46436094841.pdf
    • http://abwingssuffolk2.com/uploads/files/90410632961.pdf
    • http://zawodydrwali.pl/app/webroot/userfiles/file/80137662212.pdf
    • http://marktoby.com/akram/know_news/admin/userfiles/file/66112039581.pdf
    • https://tempatpasang.com/contents/files/zezipulowelaromimaf.pdf
    • https://vrindaindia.com/php/joseph/uploads/file/gatupibixoxedimi.pdf
    • https://imad0c0.com/js/ckfinder/userfiles/files/90035128337.pdf
    • http://aias.pnu.ac.th/ckfinder/userfiles/files/91746497816.pdf
    • http://gzperson.com/uploadfile/files/2921324125.pdf
    • http://firmen-bekleidung.at/userfiles/file/9790395109.pdf
    • https://dongcohonda.com/userfiles/file/41767685374.pdf
    • http://www.derbysignandgraphics.com/uploads/file/95903681178.pdf
    • http://infosierra.es/images/editor/fevijodivanoxitomu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b824.bin
5cd4f1c3e0cf0b913423ed114a7815f345ce0434962565f1aafa3e6583942f39		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB824 15488 bytes
font_01_sfnt_off0000df99.bin
4bf9b6b83f181a6b644794a35fdc8a88891f20d29fda158a998aca0054ec7327		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF99 11452 bytes
font_02_sfnt_off0000fa64.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA64 16792 bytes

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