Malicious PDF — malware analysis report

Static analysis result for SHA-256 738e5ddb5a6d5179…

MALICIOUS

PDF

81.0 KB Created: 2021-10-09 01:23:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a9d7340898f4ce99e87e6d7ddc664f60 SHA-1: 528bcc0004e81dbea349395df58e063ec21ccedc SHA-256: 738e5ddb5a6d51791d77a1020cd28c6af7e6078ca605dc32c016ebd460a1acb0
126 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, with one heuristic specifically flagging it as a link farm on disposable hosting. The PDF_URI heuristic points to a URL that appears to be part of a feed, potentially used to distribute the malicious PDF itself. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent beyond the presence of embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://toitureetfacade.fr/data/Files/91046752285.pdf In PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/28660912434.pdfIn PDF document text
    • https://777mto.info/contents/files/fositujifubojavitagi.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/gifunejisefewesivero.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/netamonedumovubonu.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/danisumo.pdfIn PDF document text
    • http://texmet.pl/userimages/file/xokesaladobupewasi.pdfIn PDF document text
    • http://okna-stv.ru/userfiles/files/78740225361.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1614bff4b82889---89683124916.pdfIn PDF document text
    • https://mimpishiosatu.com/contents/files/guvirubuduxe.pdfIn PDF document text
    • https://h1t-url12shio-turbo.com/contents/files/zobukonitijiluxuko.pdfIn PDF document text
    • https://intekcanada.com/ckfinder/userfiles/files/44751909181.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/9fc7e489115bb3b361d2b7d9a662d7d1/sitokofol.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/fusatijatazen.pdfIn PDF document text
    • http://sualpturizm.com/userfiles/file/vapibe.pdfIn PDF document text
    • http://eltprof.ru/userfiles/file/sezigeb.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/kutifopuwuret.pdfIn PDF document text
    • http://safetyassessmentsolutions.co.uk/ckfinder/userfiles/files/30518010100.pdfIn PDF document text
    • https://www.cylinder96.ru/admin/ckfinder/userfiles/files/59883950364.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/36200390415.pdfIn PDF document text
    • https://mikludava.lt/images/files/rerasoz.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/84362233933.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=how+to+delete+all+email+on+outlookPDF 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_off0000d524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD524 10408 bytes
SHA-256: c6e47463c2d9bf221f1efcb22b950480a6a34035c515015aab3356e8935b2312
font_01_sfnt_off0000eca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B6 18988 bytes
SHA-256: aac0cbf65cfbd488fc0342b32d3cfd8c9cc3859e246d955aa162d868de2a7cf8