Malicious PDF — malware analysis report

Static analysis result for SHA-256 2848501e6e8f7cae…

MALICIOUS

PDF

82.5 KB Created: 2021-03-31 18:47:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: ddd50529c51274c18a947ece02e45eac SHA-1: 260f3c6b4064307c6df4823ffe57937cb812e8d3 SHA-256: 2848501e6e8f7cae0130727acbd91934b1e5833f346eb5e65e9742e3f44b6eac
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm designed to redirect users to external sites. The document body, though heavily obfuscated, contains references to 'carburetor diagram pdf' and is generated by wkhtmltopdf, suggesting a lure for search engine traffic. The numerous external links, many hosted on disposable domains, indicate a probable attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://gimoguvi.ru/award?keyword=carburetor+diagram+pdf PDF link annotation
    • https://liwifaxuje.weebly.com/uploads/1/3/0/8/130874244/6ad046ae9ad743a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474980/normal_5fe611e845d6a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446502/normal_603d2d3a4ac4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378628/normal_602923211c826.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378856/normal_603c24afd24bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496015/normal_601831220a98f.pdfIn PDF document text
    • https://zizovelet.weebly.com/uploads/1/3/1/3/131380569/ruwaxapilad_simeseduwuzetil_sorix.pdfIn PDF document text
    • https://xelasukozulete.weebly.com/uploads/1/3/2/6/132681542/dosutetoluketa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419415/normal_6013b4a29eab1.pdfIn PDF document text
    • https://sedezexe.weebly.com/uploads/1/3/4/3/134342112/nowat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496225/normal_6050252dc5424.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373519/normal_604893d44cc07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388163/normal_6016ec19064d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388046/normal_603b75901b873.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470826/normal_5ffe045a82a95.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393358/normal_604387b32b8b9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408330/normal_5fe2c5a7f1d81.pdfIn PDF document text
    • https://bifukumuvu.weebly.com/uploads/1/3/5/3/135347201/1a87a62aaf57ab7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369656/normal_5ffb11b02cdc0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387919/normal_5fcefcc7e5e82.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/08744dd0-3830-40f4-a11d-5a95747790b6/90338118300.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69655a77-02ea-4b12-8ab2-e2582fdddd19/xutifot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96747873-d9b6-492a-9dec-78891c0c61a6/volume_of_cylinders_worksheet_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d8b4e8e-0824-4ed8-b04a-ff27e749eef8/lao_tzu_water_quote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfa83455-57e0-4e3a-af74-1613ceffe951/what_to_do_when_youre_good_at_everything.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1494ab4a-622b-460a-b3a0-5989935b7be6/what_grade_level_is_the_lion_the_witch_and_the_wardrobe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70f9b6ad-b27f-48ba-a928-ef940412de99/72032194339.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a171ba0-7a95-449e-a35e-4e997eee0440/sidogef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2475f3c-125a-4ec0-9000-078b2138383a/bosezoletes.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_off000105f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F2 5196 bytes
SHA-256: 27067429b80490be1efcdb7d016f5dccde57ca6d666ebff8beef300a0f8e9b22
font_01_sfnt_off00011780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11780 10912 bytes
SHA-256: e8c4487de7e3accb40c2eb6dc1278940046a89642ba753e3b6917bbf980a3b51

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