Malicious PDF — malware analysis report

Static analysis result for SHA-256 a164785444e211d8…

MALICIOUS

PDF

82.7 KB Created: 2021-09-10 20:57:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cc7df74ad5035c695cccc664bedfbb8f SHA-1: 1a20e9e30d9a73c4014e25d72eb76f5fc2c066b0 SHA-256: a164785444e211d8eb7c78ecc6f578964994c468af6809e33102be67d78d2a4b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a link farm with numerous disposable hosts. The embedded URLs, particularly the one pointing to 'lovec.bg', suggest an attempt to redirect users to malicious or unwanted content. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://lovec.bg/root/ckfinder/userfiles/files/45463192313.pdf In PDF document text
    • http://garderoba.sk/images/_file/tilasugux.pdfIn PDF document text
    • http://max-metal.pl/gfx/file/gedawerefonilifabepevatek.pdfIn PDF document text
    • https://atrax.hr/files/fekuwubokuvajab.pdfIn PDF document text
    • https://molecult.metallo-tests.ch/sites/web/upload/files/97577737930.pdfIn PDF document text
    • https://chatham-ebenezer.ckdomain.com/uploads/userfiles/files/329494463.pdfIn PDF document text
    • https://rentcar888.com/uploads/files/202109030610025362.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/33022700503.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/jufusil.pdfIn PDF document text
    • https://siltri.com/fck_upload/file/faporixiloxol.pdfIn PDF document text
    • http://baldonimarcostudio.eu/userfiles/files/lamoju.pdfIn PDF document text
    • http://bxbrdh.marketsearching.com/upload/files/tuvujelakewarelarovi.pdfIn PDF document text
    • http://bongoes62.dk/userfiles/file/18925163406.pdfIn PDF document text
    • http://kruengrangthai.com/files/files/bowawomaruzatefoxuzu.pdfIn PDF document text
    • https://safe-international.com/userfiles/file/32079628207.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/61558635146.pdfIn PDF document text
    • http://www.yevres.fr/ckfinder/userfiles/files/5712992794.pdfIn PDF document text
    • http://bydnjl.com/userfiles/files/89346570240.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/vutedazaponolorebot.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16130a0d909e6d---kisivigoxipo.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/25967217787.pdfIn PDF document text
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/114274872.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/59196380482.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=download+aplikasi+android+untuk+laptop+windows+7PDF 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_off0000df07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF07 17292 bytes
SHA-256: c5c265311dde84a3647df764465048bda59e0996c46e21d40f9353ef6eff82a7
font_01_sfnt_off00010c44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001245b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1245B 10580 bytes
SHA-256: 5be7f8ea346385a984e71428f1f1d6171217a609370f03925dd9d3d700b68bbe

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