Malicious PDF — malware analysis report

Static analysis result for SHA-256 51dd2ca421c730d6…

MALICIOUS

PDF

73.6 KB Created: 2021-09-30 22:46:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: fefaf27bbe3c4685b28f76b2fba45292 SHA-1: 5a39d87dbd9f429fc4b187af11b8f80cfcd7cceb SHA-256: 51dd2ca421c730d6ab8d85529c6d846dd25e935c03c2a98ee3e826991f128ded
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF structure and the presence of external URIs suggest an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://imosa.asia/uploads/files/202109191215315904.pdf In PDF document text
    • http://studiolauramoschini.it/userfiles/files/41384202092.pdfIn PDF document text
    • http://librojuridico.com/aym_images/files/didujepe.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/3002240684.pdfIn PDF document text
    • http://ondamarinarest.com/upload/files/53758256864.pdfIn PDF document text
    • http://parentini.it/userfiles/files/14905855344.pdfIn PDF document text
    • http://rsti.biz/files/fck/file/60072133696.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/dadibevagedibasojurogura.pdfIn PDF document text
    • http://josepholszowka.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/durosorika.pdfIn PDF document text
    • https://sayurmateng.com/contents/files/kogejovusiwabixawamola.pdfIn PDF document text
    • http://jiin-torng.com/uploadfiles/20210904181009.pdfIn PDF document text
    • http://studiobonvino.com/userfiles/files/jevixirimimi.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a32c310720---midebetowomuxaramupewowud.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/68696928671.pdfIn PDF document text
    • http://re-media.ru/foto/ck/files/zuzulelijofa.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/27715715731.pdfIn PDF document text
    • http://coomargroup.com/ckfinder/userfiles/files/juvewapanuwu.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/59792378919.pdfIn PDF document text
    • http://rayocazar.com/images/elfinder-1.1/files/file/80000363848.pdfIn PDF document text
    • http://delifarm.com/images/file/gojatabo.pdfIn PDF document text
    • https://zagorjeadventureteam.hr/files/27374376659.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=android+studio+mysql+connection+examplePDF 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_off0000b38f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB38F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA1 19404 bytes
SHA-256: ff61010a8d898932c3f045613388e1aa7183446df0fbc1e695535b8f653229ee
font_02_sfnt_off0000fdd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD3 11120 bytes
SHA-256: 3f3064bc59a058167f74e8e2dd255b894b081514267f9ddb11a8cdce2a51cd3c

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