Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa7f0d2715fb8086…

MALICIOUS

PDF

79.4 KB Created: 2021-02-13 06:29:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 628f1ffc23092254a0863328f0fb3490 SHA-1: 92fbeaefc312fc5ba3d5c6daef1fdd30b23567e8 SHA-256: fa7f0d2715fb80867454a5bf4263dfee40e76567d35c507c1c105fdfdb372f6b
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing operation. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, indicating the document's purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/wix?keyword=school+counselor+personal+philosophy+statement PDF link annotation
    • http://lakulikelanu.iblogger.org/muxibilufaxeguxu.pdfIn PDF document text
    • https://sudarixadozitot.weebly.com/uploads/1/3/5/3/135331315/jewuro-faxinupidun-jojakezim-melazedutim.pdfIn PDF document text
    • http://vizionsmc.net/iphone_assistive_touch_apk_for_androidqp3c8.pdfIn PDF document text
    • https://zagefejov.weebly.com/uploads/1/3/2/7/132710748/rosaxovew.pdfIn PDF document text
    • http://mamontov-net.cc/33513643142ogets.pdfIn PDF document text
    • http://barberking.best/bluetooth_pc_driveray71c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422909/normal_600a1efce7bc8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490250/normal_5fdb24cbca3ba.pdfIn PDF document text
    • https://mitewowepo.weebly.com/uploads/1/3/0/8/130813710/35361.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456376/normal_6026ef29948ab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502817/normal_5ff6794b43443.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420612/normal_6008ca794a81c.pdfIn PDF document text
    • http://afterdealer.pro/mexodovitezalodeto7oatg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://dofiruser.epizy.com/budevedumazapuzulow.pdfIn PDF document text
    • http://tifumego.rf.gd/44152369655.pdfIn PDF document text
    • http://zobawukesilebaf.epizy.com/my_school_kindergarten_worksheets.pdfIn PDF document text
    • http://wutivufugisev.epizy.com/nezokugu.pdfIn PDF document text
    • http://xegiseko.epizy.com/xonivigesigofogukurot.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB2 5260 bytes
SHA-256: 5db449823a36178a077c5971c796066d02d6eac2d792023eb5639f794df8c805
font_01_sfnt_off0000fd58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD58 11232 bytes
SHA-256: dba34b07c893dba58f46bee3f1b222d75f06294a12f6d09b18324fed331b324e
font_02_sfnt_off000121e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E7 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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