Malicious PDF — malware analysis report

Static analysis result for SHA-256 1db34ecc1c0d6b62…

MALICIOUS

PDF

80.5 KB Created: 2021-03-30 05:21:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 7073602993c3342ca04706d9ac7af2b5 SHA-1: c9fa12092a3bf5ea08b556b8dbc59111aa082f82 SHA-256: 1db34ecc1c0d6b62f4d5b3f8aa43723bb2ce7e3e169d4098b903e059ac966c83
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://golowaki.ru/strik?utm_term=how+to+wrap+a+present+with+ribbon PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4412774/normal_6037559ba2c92.pdfIn PDF document text
    • https://dexekuweda.weebly.com/uploads/1/3/4/7/134705305/9209364.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450340/normal_601b7d1243a4a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502336/normal_600d092bb1e9f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388276/normal_60368a030c60d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391621/normal_604d5cec7d528.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491155/normal_605f3a328e855.pdfIn PDF document text
    • https://sifapovidajep.weebly.com/uploads/1/3/0/7/130738911/gigifowonul-vugomure.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414161/normal_5fedaabd9d25b.pdfIn PDF document text
    • http://nariwunuzaw.scienceontheweb.net/amphitheatre_design.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446388/normal_603dea3fcb554.pdfIn PDF document text
    • https://simazilojimi.weebly.com/uploads/1/3/5/3/135345327/807f06c441bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380887/normal_5fe7926cbe9de.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
    • http://kepewitibafef.myartsonline.com/coordinate_graphing_pictures_middle_school.pdfIn PDF document text
    • https://s3.amazonaws.com/punurum/husqvarna_viking_scandinavia_200_sewing_machine_price.pdfIn PDF document text
    • https://s3.amazonaws.com/fenatagazise/basketball_diaries_book_free.pdfIn PDF document text
    • https://s3.amazonaws.com/defipedibe/ppsspp_emulator_games_list.pdfIn PDF document text
    • https://s3.amazonaws.com/xonobijikivo/15805998752.pdfIn PDF document text
    • http://suzifoki.myartsonline.com/cancer_de_seno_fisiopatologia.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_off0000f106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF106 4856 bytes
SHA-256: 3eb252d40dce8d85cea30ee5bb34ed7417e85cc0737ddb1f26ee5cc80b741adb
font_01_sfnt_off00010179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10179 10896 bytes
SHA-256: 62d778a6a115688c788c0e56ce384858d55dc3211f96890ce46fb0cc51986e22
font_02_sfnt_off0001268e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1268E 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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