Malicious PDF — malware analysis report

Static analysis result for SHA-256 1026e55e839a53e8…

MALICIOUS

PDF

68.0 KB Created: 2021-10-01 04:49:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b0d4095228129ce4b4fb6c7c99de4507 SHA-1: 279f050ed60bab0e0861f042dacf2d170195fa50 SHA-256: 1026e55e839a53e8f845e23878cdb79ebe75ab1eb4a734678861c5fc745a183d
154 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and is flagged as a phishing lure due to its image-only nature and clickable action. The embedded JavaScript and external URIs likely serve to redirect the user to malicious content or download further payloads. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://huntic.ru/uplcv?utm_term=200+battery+life+apk
    • http://kssi.ir/public/userfiles/file/12380615172.pdf
    • http://anapharmata.hu/ckfinder/core/connector/php/files/golitedukogagabetixogapu.pdf
    • http://www.tiande-global.com/ckfinder/userfiles/files/14082461658.pdf
    • http://hocikto.info/userfiles/file/vowotafiz.pdf
    • http://aroma-es.site/yamituki-n/uploads/files/jukivasiliwuxe.pdf
    • http://www.portaldasfreguesias.com/portugal/vianadocastelo/vianadocastelo/geraz_do_lima_sta_maria/ckeditor/ckfinder/file/8509436714.pdf
    • http://www.creativitaecomunicazione.it/js/lib/ckfinder/userfiles/files/vovoxavigojire.pdf
    • http://grupopiscis.com/upload/files/49720816384.pdf
    • http://rewitex.pl/userfiles/file/vufafidexavibusofaka.pdf
    • http://xn----7sbjvweekof5d.xn--p1ai/files/files/nikejebivuwuvo.pdf
    • http://zoncmswebsitebeheer.nl/files/editor/file/52517822418.pdf
    • http://asckhn.com/acskhn/userfiles/file/69428094578.pdf
    • https://otterdisplay.com/userfiles/file/53229540827.pdf
    • http://kondicionery-noginsk.ru/upload_picture/file/dodave.pdf
    • http://nurugelexport.com/ckfinder/userfiles/files/27802233930.pdf
    • http://hanboo.cn/Uploads/file/2021092514254670554.pdf
    • http://duepassidalcentro.it/userfiles/files/leluzikozi.pdf
    • http://www.gonouvellezelande.com/files/71945289967.pdf
    • https://coebmsf.com/userfiles/file/fofaxutajaviwefasine.pdf
    • http://vladjurnalist.ru/archive/file/63439104246.pdf
    • https://anfauglir.com/images/file/jiluxixakojin.pdf
    • http://wxeina.com/userfiles/files/bevozinorezusugom.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_off0000af17.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF17 16792 bytes
font_01_sfnt_off0000c729.bin
23c68061e4fd1cd8e70b9927f594059c0f6a3e96d11c564fbcf3f3511e411abe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC729 14136 bytes
font_02_sfnt_off0000ea59.bin
1c72b12ce4b7121565a077da728f63319ff40172e4169239881ba7c7ad90bdbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA59 10448 bytes

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