Malicious PDF — malware analysis report

Static analysis result for SHA-256 231e9c2e642bf48a…

MALICIOUS

PDF

81.4 KB Created: 2021-09-17 17:20:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 8dbaf7154e70186588ae40608c713900 SHA-1: bd4594d3610504f35963f56bf978d46fb067e257 SHA-256: 231e9c2e642bf48ad559d33add1b4e8e66334ac1e39985431915a79a1202d4cb
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and a high number of external links, many pointing to disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or serving a secondary payload via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pistant.ru/uplcv?utm_term=android+get+current+latitude+and+longitude PDF link annotation
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/31701370355.pdfIn PDF document text
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/29156646797.pdfIn PDF document text
    • http://forti.in/userfiles/file/4781502193.pdfIn PDF document text
    • https://beldapin.com/calisma2/files/uploads/52935968595.pdfIn PDF document text
    • https://idosekotthonaveresegyhaz.hu/files/files/sugiviwobomibuvidides.pdfIn PDF document text
    • http://studiotipaldo.com/userfiles/files/76102095483.pdfIn PDF document text
    • https://www.miotsukushi.or.jp/system/ckfinder/userfiles/files/88336789110.pdfIn PDF document text
    • http://kanalizace-ul.cz/userfiles/file/80761229975.pdfIn PDF document text
    • https://matratva.in/userfiles/file/31666156754.pdfIn PDF document text
    • http://vakoplus.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/dumivobutepamogolato.pdfIn PDF document text
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/kerisofunekamewejewuvobi.pdfIn PDF document text
    • https://nidi.mk/ckfinder/userfiles/files/79753160722.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/17974735842.pdfIn PDF document text
    • https://giasidaily.com/uploads/userfiles/file/28662998645.pdfIn PDF document text
    • https://foursservices.com/nbloom/fckuploads/file/retoniwepobeleniwobus.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/pugije.pdfIn PDF document text
    • http://vswet.ru/f/nazalagaxiwajesisolis.pdfIn PDF document text
    • https://endeligmandag.no/e-brev/data/div/99674804066.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///wokojamogilugebomulebare.pdfIn PDF document text
    • http://hangtatmj.com/userfiles/73086353556.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/63969465024.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/peruvinaz.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/11757535033.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/dovulut.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_off0000da75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA75 17612 bytes
SHA-256: d004594fa13cbbd68f59fea277e97bfb5a32cd292ab44cff418c96a389aca801
font_01_sfnt_off000107eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12002 10456 bytes
SHA-256: 17a72e7eb96f516e243002ff6467d6ed99e349d048f34f497560b06aac28556f

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