Malicious PDF — malware analysis report

Static analysis result for SHA-256 a82263edca34784d…

MALICIOUS

PDF

80.6 KB Created: 2021-09-18 19:32:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1fc0dadf305c12ab1bbf8dfea32b75ad SHA-1: f8fcd6e5348da2781ff242c3d7b3412d49b7e608 SHA-256: a82263edca34784dc53415cbd11f368feaf5b9d802b0e302dba6954434f0458e
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which are part of link farms on disposable hosting, suggesting a phishing or malware distribution campaign. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically indicates a non-clustered link farm on disposable hosting, with one URL pointing to 'irlanc.ru' which is likely a redirector for a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://irlanc.ru/uplcv?utm_term=windows+movie+maker+software+download PDF link annotation
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/pisovijogepufuwitir.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/161368d359d72a---pudukuvufarenutipubab.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/tugamodutijumamu.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/towujigozagit.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/32591235496.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/75598836966.pdfIn PDF document text
    • http://domesticsolutionsagency.com/userfiles/file/28021415691.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/bisifogunoxewojul.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/96427682039.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/xewopururigejesexaxulim.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/fikixalixabotizogizoti.pdfIn PDF document text
    • https://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/48696691543.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/34905513346.pdfIn PDF document text
    • https://bazk.info/public_htmluploads/file/vebogomumetasenudaluluj.pdfIn PDF document text
    • http://workontext.ru/media/file/84986245062.pdfIn PDF document text
    • http://drcleancenter.com/uploads/files/202109111131267406.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/vejapibowuti.pdfIn PDF document text
    • http://csp.hu/editor_up/zezusinufetere.pdfIn PDF document text
    • http://premiercontractinginc.com/files/file/kosereba.pdfIn PDF document text
    • http://osayit.com/images/file/woxemosedibexosiz.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/luzituresigoba.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/22793630553.pdfIn PDF document text
    • https://smartech.lv/sites/smartech/uploads/documents/files/91604749729.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/15070849964.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_off0000d80a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF021 10752 bytes
SHA-256: 5f036a4d8cdc6b33c1cc289df449934c74b1734a2c9918335bd93f726bdc15d9
font_02_sfnt_off000108e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E3 16708 bytes
SHA-256: 458529d1605bf7023cbad120818daabd7f51ac8727cc28f3b3e419e6a5ddf21f

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