Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c73d8b1451cec4e…

MALICIOUS

PDF

75.8 KB Created: 2021-03-03 03:18:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d352242a00be07c0de12c2811acc8392 SHA-1: 5061c695ba92fd0f32c97fb0e8010ff7eb004685 SHA-256: 8c73d8b1451cec4e3641d84a30d4ff211e546ca4a63fbac2f1b6576454a4bbfe
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with several pointing to known malicious redirector infrastructure or disposable hosting, suggesting a phishing or malware distribution campaign. The presence of embedded links and the PDF structure strongly suggest an attempt to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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=sketchup+make+face
    • http://vash-komfort5.ru/88597268402ril3b.pdf
    • http://pixxel.life/live_pakistani_tv_channels_on_youtubel3ykz.pdf
    • http://tozofuji.scienceontheweb.net/how_to_find_geometric_mean_formula.pdf
    • https://mefufexuwi.weebly.com/uploads/1/3/4/0/134019004/79c53.pdf
    • http://xoroketogejuxe.mywebcommunity.org/8710868942.pdf
    • http://zizodoroluxonaf.sportsontheweb.net/25972894349.pdf
    • http://instasale.company/kebasumiruzhagd9.pdf
    • http://vojemodipu.sportsontheweb.net/motorola_xtl5000_service_manual.pdf
    • https://jekodijup.weebly.com/uploads/1/3/4/4/134490718/4466715.pdf
    • https://xafasujogi.weebly.com/uploads/1/3/4/3/134374351/3026238b63b86b.pdf
    • http://tuwasukam.getenjoyment.net/hp_officejet_pro_8600_turn_off_double_sided_printing.pdf
    • https://mizavujubamu.weebly.com/uploads/1/3/0/7/130775062/mutuni-fuxesidafema-jebudipofir-vakizevexuwox.pdf
    • http://newsportstechnology.ru/duvebetovatubisuzobesafuknlv.pdf
    • http://apparentlyopt.com/mebimaluralikaf372ah.pdf
    • https://deluwibenarut.weebly.com/uploads/1/3/1/3/131382693/1387405.pdf
    • http://raisinshub.club/fifaxoxomibisakevekzwhia.pdf
    • http://blubadgehelp.net/386777456620asfb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tuxalowafokuvo/zara_men_s_shirt_size_guide.pdf
    • https://s3.amazonaws.com/tobovunoberiki/zewapizapivekiso.pdf
    • https://s3.amazonaws.com/moduxanakuri/nedewu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecfc.bin
8737881eddae842f2b4d8b096ffd4d4e8dd1655ba9b8260ac7beb0ca4ec7b0de		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECFC 5116 bytes
font_01_sfnt_off0000fe4d.bin
2babeebb8eb03e3157d4b36d70bcf70381cb607971fcecf6577271492eea37db		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4D 10440 bytes

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