Malicious PDF — malware analysis report

Static analysis result for SHA-256 13c0603377a3cf28…

MALICIOUS

PDF

82.8 KB Created: 2021-09-19 02:51:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cdccd5f2e53128871ff0bba51e6f8c79 SHA-1: 92ebf4bb3d0332f79dee67af19695c0912e1c15c SHA-256: 13c0603377a3cf28eb1dccaa0b045c146f96818079dbf4928853e81896ec8da2
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and a high-confidence heuristic for a malicious PDF, indicating it's designed to exploit vulnerabilities or redirect users. The presence of numerous links to external PDF files hosted on potentially disposable domains suggests a link farm used to obscure the ultimate malicious destination. The ML classifier and ClamAV detection strongly support its malicious nature, likely as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • 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://nomylo.ru/uplcv?utm_term=rearrange+icons+android PDF link annotation
    • http://wmsone.com/eimages/file/44106384865.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/79991998164.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/famubosakawogo.pdfIn PDF document text
    • https://motty-etai-sharon.com/files/files/42077309030.pdfIn PDF document text
    • http://tecresconsolidamentorestauro.it/fck_data/file/86080117359.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/9172494644.pdfIn PDF document text
    • http://thai-apsproducts.com/file_media/file_image/file/87327212506.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210911_15AA211209F13B49.pdfIn PDF document text
    • http://gsprojekt.eu/userfiles/files/84922185600.pdfIn PDF document text
    • https://internationallanguagenavigators.com/media/32200634652.pdfIn PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/situxen.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/81052103641.pdfIn PDF document text
    • https://artcorner-fiberglass.com/userfiles/files/88207534252.pdfIn PDF document text
    • https://onderhoudnlgarantie.nl/upload/file/30876931318.pdfIn PDF document text
    • http://motorlustor.net/userfiles/file/98942139977.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/samovejunutaxigegikopibib.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/50347913537.pdfIn PDF document text
    • http://mweb.cz/images/file/xurip.pdfIn PDF document text
    • https://s-serviss.lv/userfiles/file/60744243303.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/jigebapawezokaw.pdfIn PDF document text
    • https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/39463669246.pdfIn PDF document text
    • https://sagarexpress.com/userfiles/file/xafalolafidegemusazufisaj.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/2354379631.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/621714c99adf9c914e3fad5da89a0e5e/tiwuriporagasogejakejanaf.pdfIn PDF document text
    • http://artattack-concerts.de/files/file/66091084577.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/87157685258.pdfIn PDF document text
    • http://gimhaejazz.com/fckeditor/userfiles/image/vezalatibogegoruv.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_off0000db7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f38c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38C 19224 bytes
SHA-256: be24d102cb93e83665b08586db3352945901fde48dea0207108fa28e2c5e8423
font_02_sfnt_off00012583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12583 10444 bytes
SHA-256: 6917d6eea8491f352eea389696daf25817b28f28f50d6ccbec1d5764c228e9a3

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