Malicious PDF — malware analysis report

Static analysis result for SHA-256 693ddeeb36bb3f1e…

MALICIOUS

PDF

67.9 KB Created: 2021-09-29 05:09:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 83ac375b788062fc32ea31eca690e709 SHA-1: 66fd99f5070a4071ff3f1f8b0cc17578dcb8fb8b SHA-256: 693ddeeb36bb3f1e7594269944ba5e18088b53f1f80092a48023af9c4e7d92b8
134 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript and multiple external URIs, flagged by ClamAV as Pdf.Phishing.Trojan. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates it functions as a link farm on disposable hosting, with 22 distinct hosts and 22 links. The embedded JavaScript likely facilitates the redirection to these malicious URLs, which are designed to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6535

Heuristics 6

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=apple+dark+sky+acquisition PDF link annotation
    • https://andhimazhai.com/images/files/sisusanekapefekebanepu.pdfIn PDF document text
    • http://hotspot-usa.com/js/upload/files/82714560559.pdfIn PDF document text
    • https://medius.sk/userfiles/file/96960472735.pdfIn PDF document text
    • https://motodubai.com/uploaded_images/files/gimovisowum.pdfIn PDF document text
    • https://ltes2.tw-goods.com/UserFiles/files/xiditovolukox.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/xirivalonivowodokutivuloz.pdfIn PDF document text
    • https://gcr.goldcrownresort.com/magazine_files/files/93361755883.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/ritajalosigut.pdfIn PDF document text
    • https://gilbertems.com/videos/file/94515867088.pdfIn PDF document text
    • http://azizolace.cz/images/file/6089333451.pdfIn PDF document text
    • http://marupi.de/UserFiles/File/88902523476.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/pasojexefuxukitilef.pdfIn PDF document text
    • https://divinescience.in/userfiles/file/niliwajowaxesafufuxaliwu.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/14159893832.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/gifixinudujewino.pdfIn PDF document text
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/75399048411.pdfIn PDF document text
    • http://bige.vn/uploads/userfiles/file/81554553314.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/15201025418.pdfIn PDF document text
    • http://tomdythai.com/userfiles/files/najibesuzumutotutivejo.pdfIn PDF document text
    • http://gerocuki.hu/user/file/wasofox.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/161469aafbcac2---79584597187.pdfIn PDF document text
    • http://chuaphucluong.com/uploads/image/files/mabamejovudatilab.pdfIn 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_off0000adf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC607 10940 bytes
SHA-256: c4ae12befb2be57cfac3380db332e553e7c5a15f019655d8c23c5b949dad30d6
font_02_sfnt_off0000df5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5C 17140 bytes
SHA-256: 973457fc0308c7f40acc407138c45dc1aeaa42b435bd6443a540c69c71d2796e

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