Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1d22a57a940e5d5…

MALICIOUS

PDF

75.6 KB Created: 2021-03-14 23:47:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 07531e7ddac243920f2334b6c631b74d SHA-1: a6bb2cde93b708eefdc163cdf9c539ee6dbfe207 SHA-256: c1d22a57a940e5d5b66d6e158e4faf46ed59a14f5b6552aeff349762d8500ca0
186 Risk Score

Malware Insights

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

This PDF file is classified as malicious and contains numerous external links, many of which point to disposable hosting. The primary URL suggests a SEO link farm tactic, aiming to trick users searching for free book downloads into visiting potentially harmful sites. While no scripts were directly extracted, the PDF structure and heuristic firings indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://mezovuduw.ru/award?keyword=a+monster+calls+book+pdf+free+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4368756/normal_5feb97d78d99c.pdfIn PDF document text
    • http://kamefutebiwef.mywebcommunity.org/fevamewixoligu.pdfIn PDF document text
    • http://zvezdasevera.online/livro_toda_sua_2i0k9l.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466996/normal_603de1a438b55.pdfIn PDF document text
    • http://tradestaroffice.com/what_kind_of_oil_does_an_ariens_snowblower_takegt6i3.pdfIn PDF document text
    • http://kunozoxutokusu.mygamesonline.org/what_does_calorie_mean_in_biology.pdfIn PDF document text
    • http://ketotreno.buzz/fadeguxabevutumopipfabq.pdfIn PDF document text
    • http://fosipuzo.mypressonline.com/3327825163.pdfIn PDF document text
    • http://fetesitomer.mygamesonline.org/pdf_appears_to_have_been_produced_by_tex.pdfIn PDF document text
    • http://vumogegotawugub.mypressonline.com/tuzaduwatuxotuxiji.pdfIn PDF document text
    • http://nesarose.sportsontheweb.net/isometric_projection_of_solids.pdfIn PDF document text
    • http://wiwovurezibaso.getenjoyment.net/zikanibotore.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://850a36a1-966c-46c3-86ed-e15bcb5778a7.filesusr.com/ugd/ede58b_3fdcc1816eb94728808d380a9c2bed3b.pdf?index=trueIn PDF document text
    • https://d0a6b1b1-1773-4622-8b5e-0ab5990a7ed3.filesusr.com/ugd/b90ba1_50e572dde603418a8c1ecd810b9f38b2.pdf?index=trueIn PDF document text
    • https://1e1f235d-56dd-4976-b20d-d38e3fe7b172.filesusr.com/ugd/210b45_727243fd92f24b788ee04f26643518b1.pdf?index=trueIn PDF document text
    • http://jetotajasavesi.atwebpages.com/92459429860.pdfIn PDF document text
    • https://cb0920a4-0dfc-4587-8161-bd3bf883b043.filesusr.com/ugd/df391a_9b04246be85442938c595cdd87fe709c.pdf?index=trueIn PDF document text
    • https://814cba0f-f649-4223-bfe6-7884e6e02b9d.filesusr.com/ugd/c1108c_fe657f1c45a84af3a65b9e8f567f1b10.pdf?index=trueIn PDF document text
    • https://5d3a3edc-1384-4eb0-a354-174dd54c13aa.filesusr.com/ugd/7f5dc5_a15f5f2ae46041bfb5c954d1c297967b.pdf?index=trueIn PDF document text
    • https://dd7ee03d-3646-4e01-a1e1-4c0a7e2c9e57.filesusr.com/ugd/d7ba0f_9be99a9b9d9644418a1beafe54fa008f.pdf?index=trueIn PDF document text
    • http://wonanikapudidak.atwebpages.com/is_twilight_breaking_dawn_part_3_coming.pdfIn PDF document text
    • https://f8d82b49-d438-4da2-b906-f876cb6fe635.filesusr.com/ugd/12dc78_6788e5c85ef246f5a9105cc32a50a31c.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d31e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD31E 5588 bytes
SHA-256: 1c78b7f13398402ac1498a7cb8296f67dcd9faf7789e3da263da85cc112523f3
font_01_sfnt_off0000e613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE613 10784 bytes
SHA-256: d9cf9bd7a53130ec31a0e73e1901a5682e85dd6474cc05a8e1c7be4a2ad319b4
font_02_sfnt_off00010adc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADC 16312 bytes
SHA-256: aad9bc0f36eadc3314e08670b59090120051e308b357201f134af3d0b781b2b0

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