Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2097500e8194467…

MALICIOUS

PDF

116.4 KB Created: 2021-01-26 17:23:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: fb0d36dc449aeb6c190b33fefa427092 SHA-1: 5ace79a7780b688699877b8158c7be7877904c51 SHA-256: f2097500e81944672b04ffac7865e41f1f02e61e8a726b1392c2756c196c5790
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable hosting, indicating a link farm or phishing attempt. One critical heuristic identified links to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • 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://traffmen.ru/123?utm_term=mosquito+magnet+executive+reviews In PDF document text
    • http://toselarasomax.iblogger.org/bobavokudesozisugetisizet.pdfIn PDF document text
    • https://cdn.sqhk.co/gukisafuw/Dhbgfsj/xobunojuza.pdfIn PDF document text
    • https://rubuvewoxuvima.weebly.com/uploads/1/3/4/8/134873715/1587320.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486751/normal_5fd2771d990ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469103/normal_600f1d416af43.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501963/normal_5fc66b7f79696.pdfIn PDF document text
    • https://nasokeluvofof.weebly.com/uploads/1/3/1/4/131453401/5985034.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391326/normal_5fe7ad692ebfa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473047/normal_6009aa287c4a6.pdfIn PDF document text
    • https://cdn.sqhk.co/zovaratigu/a8gdLXr/87291994556.pdfIn PDF document text
    • https://cdn.sqhk.co/jurunuxetal/IdpIghs/first_horizon_bank_mobile_app.pdfIn PDF document text
    • https://cdn.sqhk.co/werutojij/Jhhlnid/rupakugasanerufe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481424/normal_5ff62f59bfb34.pdfIn PDF document text
    • https://cdn.sqhk.co/difanemifal/0QF9Exb/26204246063.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410414/normal_5ffc560f3ad6b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391319/normal_6002161a759b0.pdfIn PDF document text
    • https://cdn.sqhk.co/kosifodalab/OgfFQUk/magic_fluids_pro_1._6_5_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/bogulevim/eigifOl/texas_longhorns_football_average_ticket_price.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pawubiba.epizy.com/wufogonowaporiniludu.pdfIn PDF document text
    • http://vumafovixono.rf.gd/test_impact_analysis_template.pdfIn PDF document text
    • http://xuwuxubemepimox.rf.gd/computer_hardware_servicing_teaching_guide.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001924f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1924F 27784 bytes
SHA-256: cdf598d05b3d043f9ac2c3dc3ff7ed07ab27af520eae8cbbd87fe855532126bc
font_00_sfnt_off00015967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15967 5440 bytes
SHA-256: 8c0613fdf2e008131881bd7dc99d2de505aa1713af5f59311f9c38c5d701ea90
font_01_sfnt_off00016bf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BF2 11196 bytes
SHA-256: 140854414f739baabb53882c3d699d6d9e2caaeda7f526f66e86072fcd1851e1