Malicious PDF — malware analysis report

Static analysis result for SHA-256 08f11ea5c407ce53…

MALICIOUS

PDF

74.6 KB Created: 2021-04-03 17:40:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 51404b25ae86eca762d0342a5475f15b SHA-1: de89052df92fa33d18a88ead97cab6a5cc2524a7 SHA-256: 08f11ea5c407ce5396109c50a9a27e4c96831c16fca595fd1f01546d58c76b42
186 Risk Score

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://druttle.ru/wix?keyword=slope+free+games PDF link annotation
    • https://nasuxixogidipan.weebly.com/uploads/1/3/4/7/134701521/73263.pdfIn PDF document text
    • https://rafafokisot.weebly.com/uploads/1/3/4/7/134738004/ba7ca98b6.pdfIn PDF document text
    • http://kibisiji.iblogger.org/winchester_weather_report.pdfIn PDF document text
    • https://mafupalitofix.weebly.com/uploads/1/3/4/0/134042392/pamemebezim-mobawipejopizen-zonafogexurako-kelibituzabege.pdfIn PDF document text
    • https://cdn.sqhk.co/nejisakatok/PpFKAhe/notes_lists_and_organisy_stuff.pdfIn PDF document text
    • http://fugomure.22web.org/92506753741.pdfIn PDF document text
    • https://fosobezi.weebly.com/uploads/1/3/4/8/134898374/wileril.pdfIn PDF document text
    • https://cdn.sqhk.co/nomitusibop/gja0ibX/vujokufo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e60c805d-b9e1-47fc-b045-983511e9ac1f.filesusr.com/ugd/116bb2_af56c193e1304d658bce59092559ffa9.pdf?index=trueIn PDF document text
    • http://subuxatofipiwiv.epizy.com/74535828574.pdfIn PDF document text
    • https://76f5a3e5-08d8-4581-9975-6c1b933a1845.filesusr.com/ugd/dbbd16_e3274c898b15406885ea776f78b224b6.pdf?index=trueIn PDF document text
    • https://fa53e508-d88d-41cb-897c-7a5b6f1bfcc3.filesusr.com/ugd/361045_ed4c373d8e934e0abc9bc7bd91d11ded.pdf?index=trueIn PDF document text
    • http://beviraveda.epizy.com/hypertension_guideline_2018_thai.pdfIn PDF document text
    • https://e0d0d77b-4c00-4265-bc22-f0cc5cf11ada.filesusr.com/ugd/957eb4_4e6eb6c811a64a58968554aab4cdf00a.pdf?index=trueIn PDF document text
    • http://zekubegem.epizy.com/16069763516.pdfIn PDF document text
    • http://guxasimedoki.epizy.com/escrow_closing_notice_template.pdfIn PDF document text
    • https://c8f6a2ed-bc8a-4fd4-b26a-19707db7c4cd.filesusr.com/ugd/1cc7e8_579c6c43e50e4f8d86c533e39ba02ac4.pdf?index=trueIn PDF document text
    • https://010f2e21-25ca-4560-806d-08cbbb7c7db1.filesusr.com/ugd/74a852_11582d93550448d9badf35a2751a57eb.pdf?index=trueIn PDF document text
    • https://67d298e0-85f4-4ad4-bf36-e1ac857e42fc.filesusr.com/ugd/b6bf5b_23497246c8244ac59293147516c79550.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CD 5324 bytes
SHA-256: 9c3ce824656811ae0991a98a15069ede086921134676d1a0b564ccc630696b12
font_01_sfnt_off0000f7d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D9 11060 bytes
SHA-256: 2741302ead88272c8e0e491adfea67b7a69310a767ff0451a4257884609e0ecf

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