Malicious PDF — malware analysis report

Static analysis result for SHA-256 c758f54dc7c1026e…

MALICIOUS

PDF

69.1 KB Created: 2021-03-07 17:50:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c23582622419888c03153d591f495b3c SHA-1: 952d9e50507e7626465356632e6041fbb50d7de7 SHA-256: c758f54dc7c1026e48f454c172302199b1026bcef5b3971153e772b116bb13e9
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one pointing to 'seumenha.ru', suggesting a phishing or malware distribution lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further indicates a pattern of using disposable hosting for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://seumenha.ru/wix?keyword=2020-21+greenville+county+school+calendar PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4426415/normal_5ff096b024859.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392441/normal_60188cb515d18.pdfIn PDF document text
    • http://mitatizizuje.mypressonline.com/gavilox.pdfIn PDF document text
    • https://cdn.sqhk.co/lunajevon/gpzjiLH/bigfm_radio_telefonnummer.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377410/normal_5ffb2dec07c4b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467043/normal_5fdfa2ac7741e.pdfIn PDF document text
    • https://cdn.sqhk.co/mafozerekat/icM9gji/defy_gravity_trampoline_park.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427267/normal_6035630936e2f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445128/normal_60198f49611af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372377/normal_600e47e4c1216.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470683/normal_60291c4ab9a0f.pdfIn PDF document text
    • https://cdn.sqhk.co/jedelamodafa/igHifhh/viserezikazute.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tulajadulixo.myartsonline.com/popstar_never_stop_never_stopping_netflix_country.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15e3a90d-ee8e-4121-92b5-64b702b484c6/livurukawiluvuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7f6c9aa-a1f8-482a-bae0-020d95f79435/24987529033.pdfIn PDF document text
    • https://926da24b-d3df-4aea-ac1b-ebdf7359a9e7.filesusr.com/ugd/fef925_69dab47aa3274e3683d087afa98cc7af.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c144473b-160a-4890-806c-b20656cc78e8/69461539943.pdfIn PDF document text
    • https://29ce6865-365c-47c4-9f0a-635d6f965865.filesusr.com/ugd/0d6b77_00b9406109f24ba7babf27f96bc743e1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6135705-ca4d-4de3-bea6-1b12053ec34d/40249573453.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_off0000d2d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D6 5624 bytes
SHA-256: e6b7b8a0b0102899d9aa96e2a63b503e81d7e6e2e347152526e05355cbaf291f
font_01_sfnt_off0000e603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE603 9516 bytes
SHA-256: 8095f957a1760b0666da2bdd6f02484746c2ff2e4de7dd81fdf54530b4c8858d

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