Malicious PDF — malware analysis report

Static analysis result for SHA-256 20e7e9978c0c3a24…

MALICIOUS

PDF

80.2 KB Created: 2021-03-11 04:43:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 2b1417f99436175e24a0746bb93df7bc SHA-1: 9da08d13849786bc951da608cc9f88071bfeaed4 SHA-256: 20e7e9978c0c3a24f7078bec36280cef8f3c7b904130bbc67e46eca59653d746
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links pointing to SEO-optimized PDF files hosted on various domains, many of which appear to be disposable. This pattern is indicative of a link farm designed to attract traffic, likely for phishing or distributing further malicious content. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://bologen.ru/award?keyword=manual+de+administracion+de+empresas+turisticas+pdf PDF link annotation
    • https://cdn.sqhk.co/lexaxemiji/ifibjiY/marktplaats_app_gratis_downloaden.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386618/normal_601c8a982895c.pdfIn PDF document text
    • https://bejizasidofivi.weebly.com/uploads/1/3/4/2/134234705/0d45ce16dab.pdfIn PDF document text
    • https://cdn.sqhk.co/wesuwajil/hajhgiD/6564764990.pdfIn PDF document text
    • https://koxizekeb.weebly.com/uploads/1/3/4/7/134770308/taguwat.pdfIn PDF document text
    • https://cdn.sqhk.co/tategupet/pheiajd/67429503272.pdfIn PDF document text
    • http://usejus.pro/74651972515qthcm.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459464/normal_5fe3a2a54a1d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447250/normal_60130cf1c30f6.pdfIn PDF document text
    • https://cdn.sqhk.co/kefivaxepaj/kkRTyvr/color_and_clarity_of_diamonds_guide.pdfIn PDF document text
    • http://dezlice.ru/around_the_world_in_80_days_2004_full_movie_online_free80o4d.pdfIn PDF document text
    • http://girizug.22web.org/inference_worksheets_for_third_grade.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443341/normal_603393eb60480.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jafuzoteneg.epizy.com/muxade.pdfIn PDF document text
    • http://murejusugu.epizy.com/sebomivemidit.pdfIn PDF document text
    • https://c2963e02-5f2a-49ff-bb4d-22715b80ab3a.filesusr.com/ugd/55efe4_90b300caa08b49839db749451eae47ee.pdf?index=trueIn PDF document text
    • http://fopekexu.epizy.com/44387894923.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_off0000f930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF930 5304 bytes
SHA-256: 88f123a156450636fb2dded7044839a676acd4171e29b5a8db13742c6b561cfd
font_01_sfnt_off00010b30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B30 11816 bytes
SHA-256: 053168d033112782b418f6e713126b7e45debb3f92dd60c04a0f19b1eb45b73b

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