Malicious PDF — malware analysis report

Static analysis result for SHA-256 f547203d5b29b860…

MALICIOUS

PDF

70.2 KB Created: 2021-09-26 18:50:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f3366033162ab90c337bddcfed3dceb7 SHA-1: 2065b2015b767525e763a2bf5679225be1b5bc23 SHA-256: f547203d5b29b860f9d36d42de51f38aa34d4f1fb183e5beb3d8d17f5cac4205
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or delivering malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous unknown URLs suggest a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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 http://bjyhyy.cn/filespath/files/20210905203113.pdf In PDF document text
    • http://orderkiwicafe.com/uploads/files/45296893931.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/vepazepetevane.pdfIn PDF document text
    • http://balletpanov.com/uploads/files/74554720265.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/zeriwagaxaveju.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f9930e5d6---61397050962.pdfIn PDF document text
    • http://musicandyouapp.com/webupload/editorimg/files/xaserokukalatatilaru.pdfIn PDF document text
    • http://gradn.ru/uploades/fckeditorfile/99681023497.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/kuzerozijifadagiv.pdfIn PDF document text
    • https://bankkartya.hu/js/ckfinder/userfiles/files/56771779259.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/89061410429.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/35646400514.pdfIn PDF document text
    • http://sprinter-lab.ru/content/File/34708226988.pdfIn PDF document text
    • https://magnanelli.com/userfiles/file/patonurelifukatepexuf.pdfIn PDF document text
    • https://iwistw.com/upload/files/nefazo.pdfIn PDF document text
    • https://www.opsclown.it/ckfinder/userfiles/files/14655698704.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/puzomaboxuzubiwetu.pdfIn PDF document text
    • http://baoveantam.info/upload/files/zigevidezidajusutawujo.pdfIn PDF document text
    • https://777mto.com/contents/files/xomipox.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/sudedolupexagebomikenowe.pdfIn PDF document text
    • http://cecev.com/stockages/files/76465041221.pdfIn PDF document text
    • http://hla.vn/upload/files/piderujupanufinixetapug.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/sinixitop.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/83213442883.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=pubg+mobile+latest+apk+and+obb+filePDF link annotation
    • 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_off0000af62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF62 15972 bytes
SHA-256: e603afbd843b6fc00c891c37c15132aa05911938ea29a2975c2f5fa3d58991b8
font_01_sfnt_off0000d854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD854 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f06b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06B 11072 bytes
SHA-256: bc0b7237bb42076a45ffe92c66a69c2bb17e204959056cfc19f1f437ff4f3fa0

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