Malicious PDF — malware analysis report

Static analysis result for SHA-256 43493340653713ec…

MALICIOUS

PDF

78.0 KB Created: 2021-03-08 04:35:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 0fd25f54bc369b35e7cd79bd3fb696f9 SHA-1: f4681a13a087f11b2b8aa1c4870646e523d79e81 SHA-256: 43493340653713ecfe426d170599e94a161109d449a7d05acec577de7058172f
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting, indicating a link farm designed to redirect users. The presence of a critical ClamAV detection and a high ML score strongly suggests malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://druttle.ru/wix?keyword=rail+of+war+minecraft PDF link annotation
    • http://faceit.su/cumulative_frequency_graph_ggplot2wv80g.pdfIn PDF document text
    • http://mezoterilijixa.22web.org/pafononamipogejolakijem.pdfIn PDF document text
    • https://safasisi.weebly.com/uploads/1/3/4/4/134472516/jusowevupi.pdfIn PDF document text
    • http://afracheat1.xyz/kunezapuxazez6torc.pdfIn PDF document text
    • https://komanogorolelew.weebly.com/uploads/1/3/1/3/131380356/9904106.pdfIn PDF document text
    • http://blacklaser.ru/warhammer_40k_rulebook_8th_edition_vk06uld.pdfIn PDF document text
    • http://apeech.ru/arlo_pro_2_setup_guide2524c.pdfIn PDF document text
    • http://albatros-trans.ru/kitchenaid_accessories_artisan_mixer_pasta_roller_set_3pcebdrgz.pdfIn PDF document text
    • https://telidububiz.weebly.com/uploads/1/3/1/4/131452987/ropebatuzer-maruj.pdfIn PDF document text
    • http://podarokinsta.online/damaripesewunirumizijznph.pdfIn PDF document text
    • http://stassikorskyi.com/49512441929icntb.pdfIn PDF document text
    • https://sitofozaliwi.weebly.com/uploads/1/3/4/3/134355749/7491584.pdfIn PDF document text
    • http://feelslike35.com/7615548638640x0h.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4454cc88-256b-48ad-9013-c0414c72072d.filesusr.com/ugd/67e251_fd8694505c924d148f1b52bbd5759ded.pdf?index=trueIn PDF document text
    • https://e5eb5b25-b33c-43e3-82d5-57ab1bf863d8.filesusr.com/ugd/b0c717_e6fc97595b3f47ea98c3893657bcb616.pdf?index=trueIn PDF document text
    • https://ffcd7f67-9b43-45c2-8e44-b15cca9583b8.filesusr.com/ugd/48bf55_dbb5599e46fe45c69e6e15563ab9a316.pdf?index=trueIn PDF document text
    • https://8c4778c4-ed17-4cf1-86f9-5448e21c5c15.filesusr.com/ugd/6da380_c538bb515a8344cb82505e3757fcbd87.pdf?index=trueIn PDF document text
    • http://birotizedu.epizy.com/saruwo.pdfIn PDF document text
    • http://jeromixowo.epizy.com/super_low_tension_classical_guitar_strings.pdfIn PDF document text
    • https://02664c88-84e5-42fa-aae3-682d3a0d4328.filesusr.com/ugd/39d081_de1623978c3e42969ff58b27f03be553.pdf?index=trueIn PDF document text
    • https://e3055f73-6236-423b-b810-4bc1a15f300f.filesusr.com/ugd/fa12d1_10fca06a775d407d90845258cf100038.pdf?index=trueIn PDF document text
    • https://4328a374-8b5c-4134-9cef-e132ca5fc89d.filesusr.com/ugd/6732b1_374af087ebc342a68a545ba9137e0b95.pdf?index=trueIn PDF document text
    • https://9e9203d9-9f5b-42f2-a849-05e42d741f90.filesusr.com/ugd/3527d5_7b22944912dd4707a924a399b4aa930a.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_off0000de9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9F 4948 bytes
SHA-256: 7f0f1ef7e35b31c7a7d609b5f9addb85fc08acbdeeb4f8a29ba2829f9a8d9395
font_01_sfnt_off0000ef76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF76 10660 bytes
SHA-256: bd04750320dd7fb1084f9dc638c95c72a61d9ef953289fd48d1294460fe5f01e
font_02_sfnt_off00011448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11448 16064 bytes
SHA-256: 8ce0575abc6f686af3c1393089841c21814f5c4838d5adbe0d649219e58da802

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