Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf18d7dd42596489…

MALICIOUS

PDF

75.9 KB Created: 2021-02-18 16:32:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 8c6a643c267c59b7e211c17891662b80 SHA-1: ded1d87a319ec450ce36508f5a096d5a5e9b0186 SHA-256: bf18d7dd425964894d3e9eca5fd00853f98ec9bf31ee95666ec298a620b89e1b
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to a known malicious redirector. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm on disposable hosting, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection further support its malicious nature.

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
  • 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 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://yafferge.ru/123?utm_term=which+fear+is+the+most+common In PDF document text
    • https://cdn.sqhk.co/duromivap/03nrxhd/sandship_crafting_factory_puzzle_guide.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478933/normal_5ff582c4de02f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474999/normal_5fe8df5563162.pdfIn PDF document text
    • https://cdn.sqhk.co/fovipobex/haiMsjg/k_pop_bands_girl.pdfIn PDF document text
    • https://cdn.sqhk.co/fabetojowuje/jihihfr/87216904894.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454421/normal_5feeba91cc2e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456699/normal_60146351656f0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469128/normal_5fe15e0eba1fb.pdfIn PDF document text
    • http://tesevamomavuruf.22web.org/thermo_king_magnum_plus_203_parts_list.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382412/normal_601f2cb315d54.pdfIn PDF document text
    • https://cdn.sqhk.co/jezuleku/ijhjdxs/72677684392.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409425/normal_5fd3d5646fd28.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418178/normal_60238b478aa88.pdfIn PDF document text
    • https://cdn.sqhk.co/vadetegubufo/cjdOKjb/whatsapp_romantic_wallpaper_free_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/ropidadegaxut/amazing_grace_vocal_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/sixolose/sefoduwelafuwof.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/ponobagomujadikidebe.pdfIn PDF document text
    • http://gexijefepawu.epizy.com/stihl_fs_46_trimmer_price.pdfIn PDF document text
    • http://lidiwerefibe.rf.gd/engineering_physics_atul_prakashan.pdfIn PDF document text
    • http://waverotefiwob.epizy.com/53080275556.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB14 5100 bytes
SHA-256: 22a0d567786e437c70526bb87c5cab60bab93ac6e46c3bdc87c3fcdf9322bbfd
font_01_sfnt_off0000fc55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC55 11120 bytes
SHA-256: 006e3c6d2b27970fc60ba6814a48a74621bd695c5304464ddbab40d7377f0d31

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