Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2c99baf989291f8…

MALICIOUS

PDF

83.3 KB Created: 2021-09-22 18:45:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ee72d7dbdcc11ebdd3fdff40f01bf5c8 SHA-1: 2da514ae566aa5ea143af2e17f2c1fe69fa3c7ab SHA-256: a2c99baf989291f8620cf1165fb4d1884cac5bc46d62b9900efe57ca7b242668
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many pointing to potentially malicious domains, suggests a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://shoppingplanet.cityplanet.ro/ckfinder/userfiles/files/gimesazopibi.pdf
    • https://beautydent.hu/editor_up/risavatisagatukesupobed.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee30375156---54164777086.pdf
    • https://alident.centralcms.cloud/galeria/files/45660177626.pdf
    • https://sahyadrisevasanstha.in/userfiles/file/79842577453.pdf
    • http://zjleiou.com/images/upload/File/sesavajugixatum.pdf
    • http://www.lebedosapartotel.com/data/yukle/files/2510871586.pdf
    • http://casadiriposomarsala.it/userfiles/files/71787955991.pdf
    • http://grupafurman.pl/!mag2011/userfiles/file/1899168163.pdf
    • http://hoachattn.com/image/files/437053761.pdf
    • http://usagimatur.com/files/others/wobuxepupikowutiru.pdf
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/90593793191.pdf
    • http://valentine.tutaylamhet.com/storage/ckfinder/files/bivel.pdf
    • https://najlepsze-w-polsce.pl/uploads/48887389188.pdf
    • https://joinvita.com/neu/userfiles/file/wutikafazowitasudoki.pdf
    • http://hongdacable.com/d/files/kipox.pdf
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/2e7c9911212ec17b371248a96e6e2957/belutosiwo.pdf
    • https://alansglobalservices.com/ckfinder/userfiles/files/45252802.pdf
    • http://bscsaoner.in/ckfinder/userfiles/files/10313951064.pdf
    • http://odnoklassniki-files.ru/images/uploads/files/13401057684.pdf
    • http://hanasushi6.com/uploads/files/zaguxe.pdf
    • http://aygroupmuh.com/image/files/2841693611.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=nlt+study+bible+free+download+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de4d.bin
e373136b4fe5ae6bf19bd5856f0c8412aefb120948bc99bae4aaad3105be1967
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4D 10908 bytes
font_01_sfnt_off0000f78a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF78A 16792 bytes
font_02_sfnt_off00010f9c.bin
7c4ace9c6c264f77cdba24b88402136c31efbc9dc01751ab02c12e5e10eca541
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9C 18392 bytes