Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5ad64e358170f84…

MALICIOUS

PDF

82.3 KB Created: 2021-09-10 00:03:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8d976e1fc0480cbfb7199ffc2ac06d0e SHA-1: 13ea8a2407c2f5f25dabd24c86a941c134050d49 SHA-256: f5ad64e358170f84a851fccdaca8c1cdbec9acf349138333f96d9c6722353b99
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous other PDF files hosted on disposable domains. The embedded URLs and the PDF's structure strongly suggest an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/37853185938.pdf In PDF document text
    • https://kalashad.com/userfiles/file/pitupezamate.pdfIn PDF document text
    • http://roomyab.ir/basefile/roomyabir/files/wokopaxo.pdfIn PDF document text
    • http://usa-ex.com/images/blog/file/90201768884.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/25545508559.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/daburiva.pdfIn PDF document text
    • http://nenayu.com/filespath/files/20210905000313.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/86013400054.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/vujapuxazaridodofejemojep.pdfIn PDF document text
    • http://sarkanyhajo.hu/files/file/49844199531.pdfIn PDF document text
    • http://mebizstekla.ru/userfiles/file/66070223672.pdfIn PDF document text
    • http://ty6600.com/userfiles/file/dumetobobibolapajaweti.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/56983085296.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/bujen.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210907_E5781972B66F1D8E.pdfIn PDF document text
    • https://valenciamaids.com/userfiles/files/roranolebipukegojin.pdfIn PDF document text
    • https://buildingexpertsdirectory.com/ckfinder/userfiles/files/janeviket.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/29198378204.pdfIn PDF document text
    • http://b40555.handyfriendship.com/upload/files/72550676739.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/53568246046.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///dojujobazarakumewub.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/84144910391.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/dovax.pdfIn PDF document text
    • https://globalathena.com/ckfinder/userfiles/files/momagupesogirekopodibudu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=apps+on+firestick+to+watch+free+moviesPDF 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_off0000dad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E6 18332 bytes
SHA-256: 56ce3ba4764adb14a89a4e36729d1453470799f68fa80adacb2404bbdaf99b04
font_02_sfnt_off0001220a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1220A 10924 bytes
SHA-256: f85a6ed8a900a71763ea017e75ab17159a37f1aee30b13dd7dc7543a552277ee

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