Malicious PDF — malware analysis report

Static analysis result for SHA-256 d49953f7897cfc38…

MALICIOUS

PDF

75.4 KB Created: 2021-09-25 23:06:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a97b945dfbfa203f61b078d9f3f28d52 SHA-1: 2ea2bae731bae25f33bcabc9ce99f6c8c6b2fe3d SHA-256: d49953f7897cfc3850854cc78c2f20631bb9a531cae108ac838f40f482e05735
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to 'irlanc.ru' and containing a 'configurer compte office 365 sur android' term, suggesting a phishing lure related to Office 365 account configuration. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of links to disposable hosting, reinforcing the phishing or malicious distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://irlanc.ru/uplcv?utm_term=configurer+compte+office+365+sur+android PDF link annotation
    • http://davidhammerstein.org/userfiles/file/74980334572.pdfIn PDF document text
    • https://ingatlansos.hu/images/userfiles/file/83249577026.pdfIn PDF document text
    • http://vdi.vn/userfiles/file/vifonozepaxadid.pdfIn PDF document text
    • https://legyenegyjonapod.hu/userfiles/files/rirativudawutegixeferovo.pdfIn PDF document text
    • http://utcsp2.rustyramone.com/uploads/files/77442736584.pdfIn PDF document text
    • https://citrasas.com/userfiles/file/javawojizapivefiwim.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/09/18/38626320034.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/moputojofimar.pdfIn PDF document text
    • https://hot-pol.com/images/file/34663481826.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/23766262537.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/wexavuwixemefan.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/novefelolikukotavorateji.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161385fa553d62---58961277591.pdfIn PDF document text
    • http://humanlitech.com/files/files/debazamixubegibizivajizit.pdfIn PDF document text
    • http://mrhobbscoffee.com/images/uploads/file/masajowogamosimaverorez.pdfIn PDF document text
    • https://isitekmuhendislik.com/userfiles/file/8219431914.pdfIn PDF document text
    • https://5703n1n6999-6a55.com/contents/files/27790340829.pdfIn PDF document text
    • https://goooinggroup.com/userfiles/files/20210916_225543.pdfIn PDF document text
    • http://rana-international.com/userfiles/files/tijafuretagideze.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/ripekudimiwozuxinivibonin.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/pusurototokubu.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/lufunirejepiw.pdfIn PDF document text
    • http://thetestmag.com/userfiles/files/seluvafibogugurujulesu.pdfIn PDF document text
    • http://metisentry.net/ckfinder/userfiles/files/jadod.pdfIn PDF document text
    • https://wheelmartthailand.com/image/upload/File/9318444332.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_off0000b90e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB90E 11520 bytes
SHA-256: d4f028c9eb1efb056aeb642eac67643c9e33eb4527c110a443a55d3a4eb3eb1d
font_01_sfnt_off0000d430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD430 19792 bytes
SHA-256: a19ad18b2222e20dc1342708751fc75bb406f69a5deb766d384916a8f14cab1a
font_02_sfnt_off00010801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10801 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1