Malicious PDF — malware analysis report

Static analysis result for SHA-256 42ff7e388fee105e…

MALICIOUS

PDF

82.5 KB Created: 2021-09-19 21:45:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f4f9fc614e71f6cbac836972907156af SHA-1: a767c023862e6437622261b011da604cbfa82dd6 SHA-256: 42ff7e388fee105ec1fdb4a88fc4070edb4bda2fe49337038912f2ccbdb61d4a
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a high density of links on disposable hosting. The presence of a visual download button lure suggests an attempt to trick the user into executing a malicious action. The embedded JavaScript likely facilitates the download or execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://akcjonariusz.com/UserFiles/file/garorodiwutuliku.pdf In PDF document text
    • http://grawerlik.pl/userfiles/file/44979701956.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/21124514266.pdfIn PDF document text
    • http://kasargod.net/uploads/file/zowikoro.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///xagodamafutiral.pdfIn PDF document text
    • http://rosg.net/sa_upload/userfiles/file/20210905115310.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/35501778464.pdfIn PDF document text
    • http://evolution-dev.com/file_media/file_image/file/60478376823.pdfIn PDF document text
    • http://belovosushi.ru/files/63642203029.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/lurenoximedekopulume.pdfIn PDF document text
    • https://global-product.org/CKEdit/upload/files/getunoposikugaluj.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/56854191756.pdfIn PDF document text
    • https://www.clinicaepilepsia.cl/ckfinder/userfiles/files/68958713582.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/96143145171.pdfIn PDF document text
    • http://seteo-dechets.com/images/file/wegebadovenuxusenewelig.pdfIn PDF document text
    • https://penzion-pod-rozhlednou.cz/img/file/xeboj.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/sesuwipaxelitudimo.pdfIn PDF document text
    • http://starma.pl/files/file/kunepepaziwekatenezegir.pdfIn PDF document text
    • http://www.yemany.com/yemfiles/files/jajipaxavifoxutudim.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff46f4d9fc---kalawabewilenajorerekob.pdfIn PDF document text
    • http://shopabrang.com/images/files/63511644781.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161375ba2ab90e---jejejorupiwimi.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/79466273792.pdfIn PDF document text
    • http://sun-dr.com/uploads/files/202109041958235487.pdfIn PDF document text
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/84229479643.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/vajozewurivelabe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=coin+master+code+generatorPDF 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_off0000ddd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD2 10696 bytes
SHA-256: 66552dee5c2ba1e6e7cdcd568a7121793e530f478792d1a74787002506a9a1d3
font_01_sfnt_off0000f625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF625 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E37 17688 bytes
SHA-256: 8c7c3179c0c7c562f43fefc84be6b426058b03e97f8fe516b936fa52ef71841d