Malicious PDF — malware analysis report

Static analysis result for SHA-256 836dcb0d16001bcd…

MALICIOUS

PDF

82.1 KB Created: 2021-09-16 10:57:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ccfcc53a89d164f8c0c29d0617d0b4c0 SHA-1: 9b8d1c9e3acd72d19d90cbc789cf9d52c7a557b9 SHA-256: 836dcb0d16001bcdb3f2db6cbc29222a46d6c3ec1eb1330e2bc391307d4df7a7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating it is designed to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript points to T1059.007, and the overall delivery mechanism is consistent with T1566.001.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://cructi.ru/uplcv?utm_term=zombie+tsunami+mod+apk+unlocked+all PDF link annotation
    • http://tichdiem.surecare.vn/uploads/userfiles/file/81566234909.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/22960661426.pdfIn PDF document text
    • http://schokofontaenen.de/idata/43164452483.pdfIn PDF document text
    • https://patc.fr/imagesfile/42004156239.pdfIn PDF document text
    • https://felicitareonline.ro/ckfinder/userfiles/files/97550053451.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/zamem.pdfIn PDF document text
    • https://maffart-guy.com/userfiles/file/72304519388.pdfIn PDF document text
    • http://gyarmatilovastorna.hu/userfiles/file/daraxutikavo.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/zawowazurupogokiseza.pdfIn PDF document text
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/76478459404.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/jodawavudafiw.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/59864354651.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/vezitozopitisorel.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/4706707528.pdfIn PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/foxin.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/37478436429.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/wixinomum.pdfIn PDF document text
    • https://tradingphrases.net/userfiles/files/50366894687.pdfIn PDF document text
    • http://77owship.netsociality.com/upload/files/66659575010.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/87196181629.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/73765547723.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/34715480544.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/mobiminulemetor.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/jixot.pdfIn PDF document text
    • https://koparieshorvathbusz.hu/files/file/12933733537.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_off0000ddce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCE 16728 bytes
SHA-256: c0c5f75e42285c1f7c153f59acdbbca124a70437c96f461fa864e6396668157b
font_01_sfnt_off00010956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10956 10872 bytes
SHA-256: 52fcfc2f24a3653760b1daf737034491aca8ae0ad21b863f9d9dc8ca122a0ce9
font_02_sfnt_off00012241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12241 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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