Malicious PDF — malware analysis report

Static analysis result for SHA-256 e125b057da643d92…

MALICIOUS

PDF

77.0 KB Created: 2021-09-14 01:20:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 40e4b82bc689f6882e03950a45d92745 SHA-1: 3511e1fda9a78d9c7a4fa458d5046adfdd00a25a SHA-256: e125b057da643d92447c7d4b928f8027e7aa7e30df285d48e1b98b737535e929
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm with numerous external URIs, suggesting a phishing or content distribution scheme. The authoring application 'wkhtmltopdf' is not inherently malicious but can be used to generate malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 http://headrepublic.pl/images/files/620032958.pdf In PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa09131658---59771238605.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/87088223298.pdfIn PDF document text
    • http://canadianrockies.info/files/file/45947477335.pdfIn PDF document text
    • http://alde-pace.org/ckfinder/userfiles/files/589457331.pdfIn PDF document text
    • https://sandp-engineering.com/ckfinder/userfiles/files/fezuwazutakiwuzovu.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161306edabfabe---36689832473.pdfIn PDF document text
    • http://servis-hradec.cz/files/file/pewulegokipujirazowo.pdfIn PDF document text
    • http://kubkao-kubpla.com/userfiles/files/noveginelame.pdfIn PDF document text
    • http://schokozentrale.de/idata/kaboretelulavalumawakuz.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/57829852797.pdfIn PDF document text
    • https://yantrasearch.com/ckfinder/userfiles/files/66619280104.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/77170673757.pdfIn PDF document text
    • https://architektor.ru/uploads/file/vomuwa.pdfIn PDF document text
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/83922572983.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/golurirarike.pdfIn PDF document text
    • http://diagcorlifescience.com/attachment/file/39517500225.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/60849076590.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/xolozize.pdfIn PDF document text
    • http://harmonie-avion.fr/actualite/files/11720870317.pdfIn PDF document text
    • https://tekartltd.com/upload/files/sivopiwubimojakegadisikaz.pdfIn PDF document text
    • http://studioferrato.it/userfiles/files/fenebasimedut.pdfIn PDF document text
    • http://standardamulet.com/files/files/7835653578.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/91916470530.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/55672131335.pdfIn PDF document text
    • http://chhattisgarhsanskritboard.in/sharpinstitute/images/files/bovupekorelezosok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=weapon+io+gamesPDF 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_off0000cc9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC9C 16632 bytes
SHA-256: 1ad65b5e93b4390991bd7e4472249342959519f2dd8f53df45ec3ee8bdcfda98
font_01_sfnt_off0000f77d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77D 10344 bytes
SHA-256: 8eb4189b5445d4c57c4238857a768ca869e484b86b4735cb256b2ae20be01fc3
font_02_sfnt_off00010ed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1