Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf4b9d247944ddc9…

MALICIOUS

PDF

73.6 KB Created: 2021-05-22 16:44:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 67cdc1050d3b5767626853f12534e57e SHA-1: d596c2629a075af457367192f1708cb2a41cbcf6 SHA-256: cf4b9d247944ddc9a63c2f73320845224c08e5231d0849cad1385226c3296ae9
174 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The presence of external URIs and a link farm suggests the document is designed to redirect users to potentially malicious websites, such as the one found at `https://jacksth.ru/strik?utm_term=baby+alive+grow+up+doll+black+friday`. The heuristics also indicate a lure related to invoices or password-protected archives, reinforcing the phishing or malware delivery context.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://jacksth.ru/strik?utm_term=baby+alive+grow+up+doll+black+friday PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4401712/normal_6060d26928c09.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405459/normal_60658f58c240e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382208/normal_60481d36d76be.pdfIn PDF document text
    • https://foxejakepi.weebly.com/uploads/1/3/0/8/130874264/kejelapopanugot_numidukusov_varufanaseses.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416929/normal_6001d86a80405.pdfIn PDF document text
    • https://lujumibuxoze.weebly.com/uploads/1/3/5/3/135350241/pigaroporelew_kuwowizoribijug.pdfIn PDF document text
    • https://zosafuwevuki.weebly.com/uploads/1/3/4/5/134524468/zitujinozegoxop.pdfIn PDF document text
    • https://fovepupaveveri.weebly.com/uploads/1/3/1/3/131384368/pojejuba-pujixew-vofogiruz-nejaxemonurez.pdfIn PDF document text
    • https://nabikiwajozipaf.weebly.com/uploads/1/3/5/3/135391661/b706c1e90.pdfIn PDF document text
    • https://rilulukopidu.weebly.com/uploads/1/3/5/3/135323077/ac028828.pdfIn PDF document text
    • https://dodezugufiz.weebly.com/uploads/1/3/5/3/135331092/4678533.pdfIn PDF document text
    • https://kiwazavu.weebly.com/uploads/1/3/0/7/130776346/woriwapibe.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
    • https://uploads.strikinglycdn.com/files/77747e54-2777-413c-b82e-e440e13d692e/2006_scion_tc_engine_size.pdfIn PDF document text
    • https://s3.amazonaws.com/naxozelozude/pudetixegufemiposedulal.pdfIn PDF document text
    • https://s3.amazonaws.com/rudelazifizuvo/shin_chan_best_episodes_in_tamil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2108565b-06e4-431c-8115-bdc9840e3793/how_much_do_interior_designers_make_in_austin_texas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f63ff6f0-370d-4f5b-8510-2a61fd0794c9/kuwozuvozido.pdfIn PDF document text
    • https://s3.amazonaws.com/tosego/what_type_of_animal_is_buffalo_weaver.pdfIn PDF document text
    • https://s3.amazonaws.com/nosepevozux/verifone_vx570_manager_password.pdfIn PDF document text
    • https://s3.amazonaws.com/visagogijulep/60947555557.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53d0e7b0-65e2-4169-8f9b-a3d7ea8e7d6b/why_is_my_spectrum_remote_volume_not_working.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_off0000d4c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C8 5348 bytes
SHA-256: 3f081550774cd2439daf1d716860d7ac90b7bd1392b1467742811a7acfe7b2fb
font_01_sfnt_off0000e724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE724 10344 bytes
SHA-256: 794fcf7840ddff5cf02493e8c994aa91346354d21967ea657666675474e05118
font_02_sfnt_off00010ab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB5 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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