Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ba180125f26d9d0…

MALICIOUS

PDF

82.8 KB Created: 2021-03-25 04:47:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef343c56080f341eb94691ca524edb3f SHA-1: 27c60148783b342f78bb54b7936f2a554246b2ea SHA-256: 5ba180125f26d9d0fbff0765be59fffba8927be3dfe1c7e94ee47727492d9257
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URLs, many hosted on disposable domains, suggests a link farm designed to redirect users to potentially malicious sites. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf, and the heuristics indicate a link farm strategy, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://jumiwimov.ru/aws?utm_term=what+are+the+7+land+biomes
    • http://jewlgems.com/cant_connect_bluetooth_mouse_to_macbook_prozh0g8.pdf
    • http://activa-fb.com/best_quality_soundbar_with_subwooferexr66.pdf
    • http://tikovg.xyz/fowaborebob61h.pdf
    • http://rm-swis-mine.com/how_to_win_a_lottery_in_nigeriab9d82.pdf
    • http://axecheat9.xyz/what_are_the_disadvantages_of_a_capitalist_economyf9jo8.pdf
    • http://galoomer.online/lutotixumomurugoadm5r.pdf
    • http://natural-shop.info/6362318325y8q3c.pdf
    • http://dvigatel.guru/30394472344t0vns.pdf
    • https://cdn-cms.f-static.net/uploads/4369318/normal_60414e6237276.pdf
    • http://lnstagramcopyrighthelps.com/kenmore_coldspot_106_water_filter_locationgpifq.pdf
    • http://generatorsale.ru/how_much_does_it_cost_to_get_a_chromebook_screen_repairoyfbw.pdf
    • https://cdn-cms.f-static.net/uploads/4385202/normal_60329f2f150b4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/97f32b51-75db-4b27-acfe-21d56e27cc2b/72147821858.pdf
    • http://fuzidix.rf.gd/gyeongbokgung_palace_guide.pdf
    • http://jazupizewatabal.epizy.com/mipovutatefefixuzijef.pdf
    • https://uploads.strikinglycdn.com/files/f8ede0ed-de13-470a-88b5-b32095d6ddec/amar_chitra_katha_freedom_fighters.pdf
    • https://s3.amazonaws.com/tetofamuxulil/62783686875.pdf
    • https://uploads.strikinglycdn.com/files/2ed78eae-74a0-4c92-a63f-2ee17728b4a1/84077137920.pdf
    • https://s3.amazonaws.com/sazariwapa/bhagyalaxmi_calendar_2019_kannada_free.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010711.bin
0719c238dfa9f1b19834450b3806897cb7d1481af6b2c0fba40f4eacd1876456		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10711 5296 bytes
font_01_sfnt_off000118f3.bin
d42e4d182d4d318bb2ffeb58a7316a804027523b23dff3b9eac1c93adcbfcbd7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118F3 10876 bytes

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