Malicious PDF — malware analysis report

Static analysis result for SHA-256 692acadc10eb94ba…

MALICIOUS

PDF

70.9 KB Created: 2021-10-02 22:08:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8102be6b18e377e0f74b27d8c58a17a5 SHA-1: 51a62ad571abf1f7de037c3a1b586fcf369fd099 SHA-256: 692acadc10eb94baa2134e573321863081f3fcf938b34aa61965b921f3ccfee9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which are associated with link farms and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded URIs indicate an attempt to redirect users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://medvor.ru/uplcv?utm_term=venn+diagram+sets+and+subsets PDF link annotation
    • https://korzo-galeria.hu/files/file/novelilimabebuxov.pdfIn PDF document text
    • http://jinsonmetal.com/Upload/file/89238591141.pdfIn PDF document text
    • https://insinkerator.us/images/uploaded/file/wopidi.pdfIn PDF document text
    • https://hssanesteban.cl/files/75522705529.pdfIn PDF document text
    • https://aitalk.vn/upload/files/lubamilogudokuluzuje.pdfIn PDF document text
    • https://asi-filter.pl/files/file/53353739998.pdfIn PDF document text
    • http://hansungidschool.com/userfiles/file/fogujuveguxonikizezujil.pdfIn PDF document text
    • https://anup.bo/images/files/rizuronikupomeri.pdfIn PDF document text
    • https://bor-diing.com/upload/files/ronasuribogurewawaxadad.pdfIn PDF document text
    • http://mkbeauty.vn/luutru/files/papojuvafurujewoma.pdfIn PDF document text
    • http://albertf.madteam.net/ckfinder/userfiles/files/99239830795.pdfIn PDF document text
    • https://purefeeling8.com/data/file/lesokojo.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/890622097.pdfIn PDF document text
    • http://narzedziascierne.eu/Upload/file/jivixefakig.pdfIn PDF document text
    • https://leresto-niort.fr/images/userfiles/files/pafibexoba.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614acd38b0d28---bobekigoludujo.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/vuduxutakisojufadulamo.pdfIn PDF document text
    • https://windscrm.net/files/file/21174911349.pdfIn PDF document text
    • https://interference.ajoda.eu/userfiles/files/87675534038.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/44731365483.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/finisinozefepifud.pdfIn PDF document text
    • http://ke-sen.com/userfiles/file/1631808542.pdfIn PDF document text
    • http://xn--jt2b56wn0ap2a.com/upload/file/202109120152413768.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_off0000b04b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB04B 10632 bytes
SHA-256: af358c2e2ec9957b50e4fa95249bcc85333854ac136b9af4cab783a90bf966b9
font_01_sfnt_off0000c86a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC86A 17680 bytes
SHA-256: 5def29a0bcdaedbc152036e21921c43c2056dcde8e3de51b0e50173dc62ad7ae
font_02_sfnt_off0000f61c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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