Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4a5577f05afc4ca…

MALICIOUS

PDF

77.2 KB Created: 2021-05-05 11:17:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 044550cba2099d1afeb28705af914579 SHA-1: 8e5a6d5b00d10265517bc68b924c03a7476bba1d SHA-256: e4a5577f05afc4cae70464a5e051ec0f6aecbe3889767857a1ad80b83728274c
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for distributing further malware or leading users to phishing sites. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://golowaki.ru/strik?utm_term=covid+19+california+policy PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4490515/normal_5ffa38664b204.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406514/normal_60302ac99da00.pdfIn PDF document text
    • http://pollsexpert.com/webkinz_cheats_for_estore_pointsabh6a.pdfIn PDF document text
    • http://zefedupawomodos.22web.org/weroxilodemajojobuma.pdfIn PDF document text
    • http://paksorond.xyz/88080455420udm6j.pdfIn PDF document text
    • http://obzorov.site/best_sql_books_for_beginners_2019nh0tr.pdfIn PDF document text
    • http://dasopupure.iblogger.org/craftsman_radial_arm_saw_model_113_manual.pdfIn PDF document text
    • http://trendmobile.ru/queen_of_shadows_tv_show_trailerkol19.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370076/normal_6024f26235d05.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://da99f664-88c7-4a27-98aa-0bbcec2e8f57.filesusr.com/ugd/66f3f9_473719c4f83c408c8174e4d8262b085f.pdf?index=trueIn PDF document text
    • https://e028ba52-6c86-493e-86b7-fecf7cd1c3eb.filesusr.com/ugd/bcb9fd_3aa28460699d4168983486c21fff19ca.pdf?index=trueIn PDF document text
    • http://ponusiniwanus.epizy.com/backgammon_opening_moves.pdfIn PDF document text
    • http://sasugud.rf.gd/20100906973.pdfIn PDF document text
    • https://178c1879-e916-404b-9861-a2431bd0f83a.filesusr.com/ugd/1aace6_72831b43090d4c3ba09ab1efcf33da33.pdf?index=trueIn PDF document text
    • https://254a6a59-343e-4b7e-907c-c4819e171fff.filesusr.com/ugd/decf6f_c0a5d685081c4a83ba0ec2a083245c1c.pdf?index=trueIn PDF document text
    • http://wiwowefitupek.epizy.com/fodofivolekifesegenufi.pdfIn PDF document text
    • http://saveluvuwu.rf.gd/47232978454.pdfIn PDF document text
    • https://1e8c0764-4a0f-46ab-84a2-5f63a8a44928.filesusr.com/ugd/6a0acf_e14dcc0b4b9e491ba45fa4ad038d8825.pdf?index=trueIn PDF document text
    • https://36425c1f-c329-48aa-845d-1f8252cb45c8.filesusr.com/ugd/01d500_4c28b1167d34413ab83160a5c514a020.pdf?index=trueIn PDF document text
    • https://8d40832c-2e2b-4284-8151-bb35a16d80ac.filesusr.com/ugd/05d014_1f8e6af2023949cc98964e1e6cc0e7fa.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_off0000f01c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01C 5248 bytes
SHA-256: 4a985b734b57acb875443e7932af944a99ff61b78db7e6ad6c631c5b267d3bab
font_01_sfnt_off0001021a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021A 11164 bytes
SHA-256: 6db8643ba76bb0edd81f3138d8941e984c71cf17b0622dd638ff65c0f304b4b2

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