Malicious PDF — malware analysis report

Static analysis result for SHA-256 110c8ecb2ca53ae1…

MALICIOUS

PDF

82.0 KB Created: 2021-10-07 04:03:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c265fd04f8088a1ff03b5fac905e4811 SHA-1: d9e32afccdb72e9e731c6e95f1b25047da867100 SHA-256: 110c8ecb2ca53ae1c58bdd2239fedf14bb58877135213be26c11001478af5d80
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many pointing to potentially disposable hosting and configured as a link farm, suggests a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://wastran.ru/uplcv?utm_term=solution+manual+for+mechanics+of+materials PDF link annotation
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613b36aa057de---likuzirisesobofur.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/15906308159.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/48796319289.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/7087445864.pdfIn PDF document text
    • http://rongqichem.com/upload/files/15678785643.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/64754577598.pdfIn PDF document text
    • https://qkon.ca/images/file/temutadodazetemogotoxuma.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/70785799732.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/76526957957.pdfIn PDF document text
    • http://www.szphotar.com/admin/img/files/72372023609.pdfIn PDF document text
    • http://xatrbio.com/userfiles/file/13738579126.pdfIn PDF document text
    • http://citlak.de/admin/UserFiles/file/dogavelaw.pdfIn PDF document text
    • https://orderpoet.com/ckfinder/userfiles/files/9069952225.pdfIn PDF document text
    • http://aadcnfgl.netsociality.com/upload/files/nufajivawulivebekal.pdfIn PDF document text
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/86453615434.pdfIn PDF document text
    • http://jhdljz.com/userfiles/file/1630569054.pdfIn PDF document text
    • https://mannoorpally.com/uploads/file/9791993171.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/94966683944.pdfIn PDF document text
    • https://888nv.ru/userfiles/file/zonelokine.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/fexig.pdfIn PDF document text
    • https://lifeteacher.tw/uploads/files/202109061404171943.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/58667632297.pdfIn PDF document text
    • https://alhurwallpaper.com/Files/files/62314614418.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/42133591288.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_off0000d50f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD50F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED21 20616 bytes
SHA-256: f54cb73d13c31c27ce169b06acd7f2ab542779b7e36f01063aefdf60f06ff1c4
font_02_sfnt_off00012173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12173 10776 bytes
SHA-256: 29dbff45f30116da00a7c85d175e70fd12583c63a1c42772db627d5e4e95e8be