Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f8da16a01acb6ec…

MALICIOUS

PDF

85.6 KB Created: 2021-09-20 02:03:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 05951aada446a78b95d11ba0a0050a4f SHA-1: d942adee6901647aa37b149e579012f971c7206c SHA-256: 9f8da16a01acb6ecd8ac1fdab874715c60faf5297aa29226335f2070bf1fcfc9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It contains a large number of embedded URLs, many of which point to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing lure or a downloader.

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 https://krisoc.ru/uplcv?utm_term=what+does+safe+mode+mean+on+my+android+phone PDF link annotation
    • https://patc.fr/imagesfile/41410238910.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/futobanogulubidini.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/bitiwagejusewegagebos.pdfIn PDF document text
    • https://kfk-dekoration.dk/images/uploadedimages/file/68388095938.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210920_F6112E1A6BF564E0.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/zofujixusoxidavavutagakef.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/45330636941.pdfIn PDF document text
    • http://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pakepanatakamamuwube.pdfIn PDF document text
    • http://studioferrato.it/userfiles/files/33281475843.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/59605844345.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/jowipakitilupuzusenolabeg.pdfIn PDF document text
    • http://podarox.ru/public/files/xokovelerimadaziduxati.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/xorixonixezubiwedupixefef.pdfIn PDF document text
    • http://yejiya.com/userfiles/file/76569923830.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/vikininejukasajufox.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/64563783619.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/21741452155.pdfIn PDF document text
    • http://edisonprivateschoolbeta.com/cote_dor_import/admin/ckfinder/userfiles/files/luxewiraki.pdfIn PDF document text
    • http://bagiez.de/userfiles/file/23105944655.pdfIn PDF document text
    • http://ieltsadd.ir/cache/fck_files/file/55159213705.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161410b6a7078a---fupepixip.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/81947743841.pdfIn PDF document text
    • http://unleadedcoffee.cz/soubory/53254279197.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c978182665---tisemawizoviti.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_off0000e926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE926 10824 bytes
SHA-256: 89fd27b1d24092ae412052730fc3bf69323443dd9ca89943c66f25c474288c4e
font_01_sfnt_off000101f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F7 17620 bytes
SHA-256: f02be225de3045811ef353e6e3090ae1b1e92b8f65cb36671a354c9f16902606
font_02_sfnt_off00013012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13012 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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