Malicious PDF — malware analysis report

Static analysis result for SHA-256 c171e0f347b91aeb…

MALICIOUS

PDF

95.9 KB Created: 2021-09-19 14:24:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8468308b8cc0a2f386c700c74ec484d2 SHA-1: 609752c82d33518f0fb233bb87b116788be5a675 SHA-256: c171e0f347b91aeb44236672bc92b43ea0b7d0094ad84313aeb77be82a7aa28a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which are on disposable hosting and utilize UTM parameters, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to direct users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • 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.
  • 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://medvor.ru/uplcv?utm_term=tenet+720p+torrent PDF link annotation
    • https://literie-depot.fr/UserFiles/file/39673215968.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16133582f719ce---27830922700.pdfIn PDF document text
    • https://dananeye.com/uploads/files/202109180256337402.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/48175601589.pdfIn PDF document text
    • http://bostoncake888.com/UserFiles/files/dexupifiwokobewuxiketunav.pdfIn PDF document text
    • http://eng.sut.ac.th/tce/2016/administrator/ckfinder/userfiles/files/wabasewanutejopotisij.pdfIn PDF document text
    • http://aokunoil.com/ckfinder/userfiles/files/50352109332.pdfIn PDF document text
    • http://batdongsandothanh.vn/luutru/files/22597733459.pdfIn PDF document text
    • https://fuoriscena.eu/file/bizesawimeri.pdfIn PDF document text
    • http://webbyshoe.com/fckeditor/userfiles/file/busimojisezozemetigutigar.pdfIn PDF document text
    • http://iscelenie.info/files/file/bavimufijoxetog.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161443e1ebcbbd---nivifepolivuxotunulela.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/turupib.pdfIn PDF document text
    • http://songdolandmarkcity.com/userfiles/file/47645721047.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363ab236a95---21647919807.pdfIn PDF document text
    • https://luckyfood.itweald.com/uploads/files/613bf5bddca36.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/jasositedadanoduba.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/23397820583.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/fugesubiditogurixis.pdfIn PDF document text
    • http://asv-solnice.cz/_files/file/darutepudiduje.pdfIn PDF document text
    • http://collectifff.be/imgdb/accueil/files/wagawe.pdfIn PDF document text
    • http://www.s-prom.si/fileupload/file/jelozowafug.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_off00010a64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A64 10032 bytes
SHA-256: bb2a2685568258971bdd833d9cbf3a0ac486c2d51531c59586c92c2ac9d29efb
font_01_sfnt_off000120d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D6 21220 bytes
SHA-256: 70fffe4b4d83da92be74ae831a74f18bffb39599257984bb7cadf81b98f2fca8
font_02_sfnt_off000158b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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