Malicious PDF — malware analysis report

Static analysis result for SHA-256 c05bb64b8978cc5e…

MALICIOUS

PDF

90.4 KB Created: 2021-04-02 06:44:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 05ec41d23cc019c3b5ebbea7a2f5e411 SHA-1: 6dea2a9912e90b5db0189d5d014947c909974c97 SHA-256: c05bb64b8978cc5e1cac1757d4d62e8f920ecca82cce4fa6f4953ad7a477afd7
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, which is characteristic of link farm or phishing schemes. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure suggests the document's primary purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://maypoin.ru/strik?utm_term=what+weird+things+are+illegal PDF link annotation
    • http://zathkatow.xyz/89374019177c4l7z.pdfIn PDF document text
    • http://pejazadajenatew.getenjoyment.net/amigdalitis_bacteriana_nios.pdfIn PDF document text
    • http://mishgen.com/21061191194wtvdt.pdfIn PDF document text
    • http://tomogorman.com/pinuxerovanapewogo1yto.pdfIn PDF document text
    • http://ridaxaki.mywebcommunity.org/grade_11_chemistry_textbook_ontario.pdfIn PDF document text
    • http://brumbum2.xyz/how_to_find_binomial_probability_distribution_on_ti-84_plusrt759.pdfIn PDF document text
    • http://wdd13.ru/80187185601dm22p.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3485775d-af35-4505-8fb4-f6750f575e04.filesusr.com/ugd/42f18e_e929bd8513ff4846a4473df0f107b002.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/daxemo/is_onyx_safe_for_aquariums.pdfIn PDF document text
    • https://1347de4c-4e54-429a-b84c-372e60bc5a2b.filesusr.com/ugd/6c98bc_9e99fa64a5494452b73efc1d9ab8be3f.pdf?index=trueIn PDF document text
    • http://kebenubes.onlinewebshop.net/university_of_miami_off_campus_housing.pdfIn PDF document text
    • https://s3.amazonaws.com/wuwabobujasivor/nopuzivemojenikusimo.pdfIn PDF document text
    • https://a12a05ab-6462-4855-b086-b0a2a961d6d8.filesusr.com/ugd/2c76f4_d9c03b6322b64d798b3a9b6c5ddd3831.pdf?index=trueIn PDF document text
    • http://noxanaviki.rf.gd/bocio_multinodular_eutiroideo.pdfIn PDF document text
    • https://69c5641f-197a-42c1-bef1-daa502c1f1d7.filesusr.com/ugd/948cea_4dd29b6a5bd44c49852a271a3b607098.pdf?index=trueIn PDF document text
    • http://lumajenav.epizy.com/36223598489.pdfIn PDF document text
    • https://601bead5-a720-4f65-98db-62fe2a42cb91.filesusr.com/ugd/0e52b4_114a1e3d0ed64ec4ad0a84bd05d08743.pdf?index=trueIn PDF document text
    • http://fevunurinowigi.epizy.com/85546011055.pdfIn PDF document text
    • http://rotufixijisadi.onlinewebshop.net/best_international_law_schools_in_germany.pdfIn PDF document text
    • http://lusovipipowa.epizy.com/acute_pyelonephritis_in_pregnancy.pdfIn PDF document text
    • https://s3.amazonaws.com/dukexajuj/zumakagevatonanuzijiz.pdfIn PDF document text
    • https://493f174a-a540-412c-bacb-e5b7b26cbfcf.filesusr.com/ugd/95bb70_16c94a6e948d460c84ecb11c519aae40.pdf?index=trueIn PDF document text
    • https://3c8197b3-f999-4f29-b3da-fbdfea3dbf34.filesusr.com/ugd/0047a4_3c7cdf17b1814297bbd79d0abbd66c9f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kulinisokakewi/99th_constitutional_amendment_act.pdfIn PDF document text
    • https://033a7475-7ccb-45c1-8f1e-38fd320d48d0.filesusr.com/ugd/03a576_180716e7db0041b893bb5482472678c8.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_off00012317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12317 5192 bytes
SHA-256: 5bc674dd7b74cbd57fdd24941200a9bd7e8a56eed7c006cb42ba294a36036e0c
font_01_sfnt_off000134d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134D3 11772 bytes
SHA-256: 50e58ba6814610ff52622cf74576c7586763ee67c36e959c3f5935b0f5d6a020

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