Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d8ec72a72ff1bc8…

MALICIOUS

PDF

82.7 KB Created: 2021-09-09 15:58:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5f0dd7905030edbb2e04e4f234380cfd SHA-1: 4be1ecf32b38f6633168ea25a3fabcbc572a8064 SHA-256: 6d8ec72a72ff1bc817d806fdcaf90f1a008023151fb27e4d472e4cb65569a46e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, and exhibits characteristics of a link farm. The PDF structure and heuristic firings strongly suggest an attempt to redirect users to malicious sites, likely for phishing or further malware delivery.

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 https://smidgel.ru/uplcv?utm_term=android+how+to+check+wifi+is+connected+but+no+internet+connection PDF link annotation
    • http://kipia-nn.ru/userfiles/file/pizekero.pdfIn PDF document text
    • http://fjzy18.com/image/uload/files/narenep.pdfIn PDF document text
    • https://pushtypathshala.com/demo/aims/files/images/files/xunogiz.pdfIn PDF document text
    • http://interstyle.org/content/xuploadimages/file/61913199410.pdfIn PDF document text
    • https://genia-groupe.fr/images/files/tovozozew.pdfIn PDF document text
    • http://tareeapartment.com/user_img/files/kirupexokifosugonopak.pdfIn PDF document text
    • http://wellogo.in/userfiles/file///14386525105.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/jafulu.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16131f19897210---xewipefisezaselifepezowil.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/161337f6fdd9dc---46621075812.pdfIn PDF document text
    • http://szcftz.com/upload/8934718374.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/16508684407.pdfIn PDF document text
    • https://renetravel.ro/images/files/dariperafelilojinusiba.pdfIn PDF document text
    • http://www.saveurspoitoucharentes.com/admin/ckfinder/userfiles/files/jegigag.pdfIn PDF document text
    • https://sharenkon.com/files/5182495591.pdfIn PDF document text
    • https://www.htlexpress.com/ckfinder/userfiles/files/rivaxofav.pdfIn PDF document text
    • http://aromacosmetics.bg/assets/userfiles/file/siniwodivumegibededaw.pdfIn PDF document text
    • https://korvioinfotech.com/ckfinder/userfiles/files/14162239395.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/5086378290.pdfIn PDF document text
    • https://www.emcp-pmce.ca/_includes/ckfinder/userfiles/files/zelusomupadadeduvojef.pdfIn PDF document text
    • http://jadeite.ru/images/file/dakixajufigoxu.pdfIn PDF document text
    • http://vitrine-prof.com/files/87016314146.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021090907484847.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_off0000da9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9D 18632 bytes
SHA-256: 82dafbb0208ac512fca40e792e71c3c6f0857b87ac1ca54c99cbd53160982dc4
font_01_sfnt_off00010b53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001236a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1236A 10764 bytes
SHA-256: 7f40a8157e0dc1fe9d80c3202fccc80e8024ce94e81883c612c9584510608180