Malicious PDF — malware analysis report

Static analysis result for SHA-256 85ef798f625248f9…

MALICIOUS

PDF

39.1 KB Created: 2020-11-07 08:24:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 03eca1f0ddb962a8f7cd93473aaeafd5 SHA-1: 2c4ea6bd4f34c42875df5cb762a45dd87bf1bd43 SHA-256: 85ef798f625248f95e1c47ef87f7911b6e4da3c074a7a8b7b7644d5ba3eb188d
184 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • 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/aws?keyword=i+love+exponents+coloring+worksheet+answers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4444100/normal_5fa3d65d46dd8.pdfIn PDF document text
    • https://bixizevabusiku.weebly.com/uploads/1/3/4/4/134403351/pexubiper_xogakef_fazubajeribirev.pdfIn PDF document text
    • https://sibafuguwo.weebly.com/uploads/1/3/4/6/134679660/tetorikusakowap_buwomitesivujuk_xazazumulituvu_daledu.pdfIn PDF document text
    • https://rapokivagifo.weebly.com/uploads/1/3/4/3/134338569/fatigupizek.pdfIn PDF document text
    • https://zukolipiniroti.weebly.com/uploads/1/3/4/4/134494738/dewotulomomise.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417807/normal_5f9b63e4b3304.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374175/normal_5fa1b0d97fc54.pdfIn PDF document text
    • https://pepotoxuxomupav.weebly.com/uploads/1/3/1/4/131483830/maxuwuxip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368985/normal_5f8a26e4ae4bb.pdfIn PDF document text
    • https://lefedatit.weebly.com/uploads/1/3/0/7/130776734/sivoki_vesejubaduwubu_duvuza_bowuvazapisu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369930/normal_5fa42b0eee8df.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/tabobujimo/mezonitalesopimo.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/86063012028.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c952738d-204a-4519-9b8f-85f956464408/vibidunojenirorujetovod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/347a6128-6d49-4020-9262-94d36e8ec94c/gesajavurewoxes.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_off00005945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5945 5416 bytes
SHA-256: 2a8ee8b8923baaae7feef7b737efd76f85d6c6e4666f73b2f820108eb2b5a5bf
font_01_sfnt_off00006bc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BC8 10704 bytes
SHA-256: 2fa460362102b335114a47ebe061891e6f23992947078750fa8c40c6f67891ea

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