Malicious PDF — malware analysis report

Static analysis result for SHA-256 c79c02cae2729bea…

MALICIOUS

PDF

66.6 KB Created: 2021-09-27 15:56:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 03296058e1971680286995fe47b6d06d SHA-1: b5afaaac2d1aed75301a6704a906226b64ea4974 SHA-256: c79c02cae2729bead02692b6b1daeb8e1c11213848711b6902d83c534b158d65
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs and the link farm structure suggest an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://garglob.ru/uplcv?utm_term=a+apk+app PDF link annotation
    • https://smg.bid/ckfinder_userfiles/files/lirifo.pdfIn PDF document text
    • http://usagimatur.com/files/others/54865240433.pdfIn PDF document text
    • http://newabel.com/ckfinder/userfiles/files/77459372878.pdfIn PDF document text
    • https://snoman.mb.ca/ckfinder/userfiles/files/rivewikakofevobi.pdfIn PDF document text
    • https://lasanisports.com/files/50614017908.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/58847339463.pdfIn PDF document text
    • https://maintogelonline2.bet/contents/files/87171815678.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/62b2af863979ab80546dc4c2356aeac2/95352901862.pdfIn PDF document text
    • https://xpress2.eu/ckfinder/userfiles/files/56132181237.pdfIn PDF document text
    • https://cathita.vn/upload/files/riwiwiz.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/wuvopevivebaximunopaxaja.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/tikekamitadasiwutifilit.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/bejazunefoferab.pdfIn PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/zaderowidafenezar.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/rologatiwafefowesomu.pdfIn PDF document text
    • http://dinobajka.pl/Upload/file/59538405267.pdfIn PDF document text
    • http://3gr-group.com/ci/userfiles/files/4611604572.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/wonusewisi.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/bekomofotajuru.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b700f7b452---2380423994.pdfIn PDF document text
    • http://siltherm.com/ckfinder/userfiles/files/kafoteferewilo.pdfIn PDF document text
    • https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/67428349340.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_off0000ac65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC65 14680 bytes
SHA-256: dc22cbe51d5473d2cf3fb3d0224ab107e16bb187adbf2d1140667e968910fd85
font_01_sfnt_off0000d133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD133 9460 bytes
SHA-256: 034590a4362923432003152cf1a73b556d89f29c69261449da0658641caaa696
font_02_sfnt_off0000e591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE591 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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