Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b87e9ccf7aee3e3…

MALICIOUS

PDF

73.6 KB Created: 2021-03-24 19:02:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c5b80efbb9d8c3110c14074dc8f7306b SHA-1: 77eb720359427d1e5027ba8e6418dcbdf2c9569f SHA-256: 2b87e9ccf7aee3e39e38f40e495e613262155025a35e929f6b8f0e6a9c24978a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_URI' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with a malicious PDF designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/123?utm_term=ladies+platform+brogues+uk
    • http://natgood.space/how_to_say_french_words_correctlyod7zn.pdf
    • https://cdn-cms.f-static.net/uploads/4408871/normal_60531947341fc.pdf
    • http://wide-mean.top/32272017997nczaa.pdf
    • https://static.s123-cdn-static.com/uploads/4369327/normal_5fcbcdfc34992.pdf
    • https://static.s123-cdn-static.com/uploads/4451932/normal_5ffe585cba2ee.pdf
    • http://mijuwaxepig.22web.org/lufadiwenedikujedusubik.pdf
    • https://static.s123-cdn-static.com/uploads/4481665/normal_5ff16f8906e41.pdf
    • https://cdn-cms.f-static.net/uploads/4443588/normal_604e0d211911d.pdf
    • http://xatitakuv.iblogger.org/tesevokegupo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/65a1ed4a-f3b4-493b-a66a-84043c206487/what_oil_does_a_yard_machine_snowblower_take.pdf
    • https://uploads.strikinglycdn.com/files/72e2515c-a983-4b46-af8a-5ab1d40902b6/77477046543.pdf
    • https://uploads.strikinglycdn.com/files/2c072638-c096-4947-a954-47cb54a2349b/how_to_fix_dripping_samsung_water_dispenser.pdf
    • https://uploads.strikinglycdn.com/files/9e844c3f-043c-416f-be22-633064851444/hs_mini_maxx_unlock_code_with_letters.pdf
    • http://padenijuwike.rf.gd/39490415372.pdf
    • http://kiganume.epizy.com/what_kind_of_automatic_transmission_fluid_do_i_use.pdf
    • http://bukinajomo.epizy.com/47303214564.pdf
    • http://dujesobu.epizy.com/32407058769.pdf
    • https://9387bd13-3746-4408-b474-2867f26e464d.filesusr.com/ugd/ace02d_e5e5af0b3c75459380345960e644c191.pdf?index=true
    • https://86f5e18a-8766-4ae7-b9bf-31430b627380.filesusr.com/ugd/911c12_7f9589eeac8c4a78b4f5bef0e716e393.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c00dcbd0-653d-40b6-ba0d-5901d6576031/35384455658.pdf
    • https://f3dc8d0a-397f-4303-99a5-a7927e83d850.filesusr.com/ugd/e916cf_4f1c10bdcf6841bb89cbd8fb2a1dd220.pdf?index=true
    • http://neduweleviwov.rf.gd/rekevu.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_off0000db20.bin
b8a6b11fc96fa5edd308f68b338bb7233c771eebc9f41a3eec530ea636d6a7ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB20 5504 bytes
font_01_sfnt_off0000edc6.bin
fad86ba4f36935ccbee170fbb2d2364908f350b35dd218ad765d536619c7bec6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC6 14536 bytes

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