Malicious PDF — malware analysis report

Static analysis result for SHA-256 f07b54593f2275a3…

MALICIOUS

PDF

74.6 KB Created: 2021-10-07 10:47:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 359aeae91178fc2401510182b96af7c5 SHA-1: 3609698a2ad61681e5142cb70ac270634246735e SHA-256: f07b54593f2275a3e8e944f445ef39dea88df2c6dee4ae1ec056018d4bd32531
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, suggesting it is designed to redirect users to potentially malicious websites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for link farms, further supporting a phishing or malware distribution motive.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://archism.ru/uplcv?utm_term=jeepers+creepers+2001+watch+online PDF link annotation
    • http://rutka.pl/media/upload/files/6692ee3e84b5fed774ff59576d952e97.pdfIn PDF document text
    • https://gulamanis.com/contents/files/lujazeramusuziwoloxajat.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/raxariwel.pdfIn PDF document text
    • http://iiiemjobs.com/FCK_Editor_Images/files/zuwipuxaseligixumejal.pdfIn PDF document text
    • http://ohsongpharm.com/ckfinder/userfiles/files/99337381258.pdfIn PDF document text
    • http://jinyudachem.com/upload/files/74712967992.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210909_1357EAA0AA7D71BF.pdfIn PDF document text
    • http://tufaghanafc.com/js/ckfinder/userfiles/files/mujizuvunisel.pdfIn PDF document text
    • http://badgerhillfarm.uk/kowaxexaxererizux.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/43881311612.pdfIn PDF document text
    • https://atrax.eu/userfiles/file/20771319196.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141e0f532581---56121811126.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/39137827464.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/jobewimesikiseremiguke.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/24575136743.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/deboraw.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_off0000bd6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d57f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD57F 17860 bytes
SHA-256: 2f3de7e1286e9c3410889facbbb110c93b29da9b5beeae1b408065207c1f0276
font_02_sfnt_off000103d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D5 10840 bytes
SHA-256: 63048a5e730ddfcfce8984f2797f4e8ab9b0578264961efa5838e0133df5f5c7

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