Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b92f65cdebe5001…

MALICIOUS

PDF

74.8 KB Created: 2021-03-29 19:44:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 892ddcaaa162e000ccc905017ae1e013 SHA-1: 7eddeac8c1ec7d7c4d8674c6629ba5c5f10cd3a4 SHA-256: 4b92f65cdebe5001e57d869135c7c5b79c718c27f6be7fe77d1e94a28fec081b
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, with one specifically pointing to a URL that appears to be part of a link farm designed to redirect users. The presence of these external links suggests the document is intended to direct users to potentially harmful websites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://soxebez.ru/award?keyword=neumonia+neonatal+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4501193/normal_5fed010296506.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450355/normal_604a8a165e74a.pdfIn PDF document text
    • https://cdn.sqhk.co/dudugetogi/fo7jjIW/47762889159.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481058/normal_5fecccee97dc2.pdfIn PDF document text
    • https://cdn.sqhk.co/temirikuji/jN7hjmi/ruxirupu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383321/normal_6042ee0891541.pdfIn PDF document text
    • https://cdn.sqhk.co/wofutajo/gcVMfbP/67603483865.pdfIn PDF document text
    • http://fexefimaga.iblogger.org/drug_metabolism_phase_1_and_phase_2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406806/normal_604138f06df29.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446394/normal_5ffaa34d3b4c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426410/normal_6020f9717e189.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453118/normal_6039f90b99988.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365546/normal_604e7b894b7cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387919/normal_605466eb85237.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447089/normal_6030aa114f424.pdfIn PDF document text
    • https://cdn.sqhk.co/sobexofap/cLhjjdm/nozifoxigagamumoterunor.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In 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://kusukod.epizy.com/what_are_starbucks_handcrafted_espresso_drinks.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30e50928-29e9-4178-b548-25c587566d7a/sizajevofoxikugudajir.pdfIn PDF document text
    • http://vogojitipam.epizy.com/worry_free_money_download.pdfIn PDF document text
    • http://tafaredos.rf.gd/rexelulopejovigaluf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a09d0a92-1ec8-4605-8f07-6bdc1d432efe/glencoe_algebra_1_textbook_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4578a54d-5762-45ef-b22f-1294f1658cc5/how_to_reset_samsung_dryer_vent_sensor.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD046 1684 bytes
SHA-256: 8b69ad8bf8706a8de8604f0485c67fb25a23b24d50174afbb8bbf061f3c53837
font_01_sfnt_off0000d8aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AA 4764 bytes
SHA-256: 50642472ffdab375ae6892cdbaaa2e98ecc197b70ea044a48f7638e1765efc58
font_02_sfnt_off0000e8cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CB 11180 bytes
SHA-256: 53c0b8e479ebcb712b92f079f20fec91c08787e10c82a3f0f3505e026ba401c1
font_03_sfnt_off00010e0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0D 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3