Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5fafb758eddc096…

MALICIOUS

PDF

135.0 KB Created: 2021-03-20 01:09:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 14209aeb932f5dd46f6d19b5ac716054 SHA-1: 14d4b6a70556c4c212b1383ae9cb9f894e57ba0f SHA-256: e5fafb758eddc096a81f4c575152f2c36ce886e31cde031ee702d27cdbc9c54b
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous external URLs, many hosted on disposable domains, designed to lure users to potentially harmful content. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDFs from web content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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 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://bologen.ru/award?keyword=georg+cantor+set+theory+pdf PDF link annotation
    • https://nolujamikudaze.weebly.com/uploads/1/3/4/8/134868466/tokoki-kadufijofo.pdfIn PDF document text
    • https://zopogunonezaso.weebly.com/uploads/1/3/1/6/131637395/4416645.pdfIn PDF document text
    • https://fekebejoluxoji.weebly.com/uploads/1/3/4/3/134309121/4697453.pdfIn PDF document text
    • http://getyourscore.info/vubatepuvabonibegit3.pdfIn PDF document text
    • http://freshmind.net/nekizuzafutop43q0o.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449402/normal_603c6a161df7b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413865/normal_6051386da97c2.pdfIn PDF document text
    • http://sandwichhq.club/elon_musk_biography_ashlee_vance_reviewft4y9.pdfIn PDF document text
    • http://lolibixavug.22web.org/26490381721.pdfIn PDF document text
    • https://wutifanuviwi.weebly.com/uploads/1/3/4/0/134041095/7200977.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://84d5b3ab-51dd-4312-87b7-51df18fb3b26.filesusr.com/ugd/9ea9b6_00641ebad9624786ac24a7f87dfadd10.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/df5333a0-8d4a-40e8-b10f-759bcccc1451/the_end_of_the_affair_graham_greene.pdfIn PDF document text
    • http://porujikegen.epizy.com/19123737876.pdfIn PDF document text
    • https://a9750898-a066-404d-a796-54a2f5ad13bb.filesusr.com/ugd/60231a_2d3a06c002a44184bf23d0a30b3908a7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/066c316c-d35a-4b00-afbd-2229bc1d3893/9334833495.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c29b27f9-56fd-4961-9dca-195ff1a30c91/how_to_write_a_rhetorical_analysis_essay_ap_lang.pdfIn PDF document text
    • https://a4edf7fa-b057-49b5-8014-e5fd436fbef3.filesusr.com/ugd/c8b2c5_58441e798e874d839b85085293781678.pdf?index=trueIn PDF document text
    • https://98350ace-7ac4-4f38-a9d9-579fdad8050b.filesusr.com/ugd/9b2d9b_e24bf4d8ebc84e7bb9bed7ab46f80a2d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9dc821a-0f8a-4aa5-ba90-b46bf68963cb/hp_laserjet_p2035n_offline.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed772e9d-4d4f-417d-978e-21fe98d2a7f3/lovabavuba.pdfIn PDF document text
    • https://0eb00d84-361a-45dc-b346-1af5c8eb785c.filesusr.com/ugd/d79848_befb7a71d7d449eda032b7e681d467ad.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_off0001b3da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B3DA 5520 bytes
SHA-256: 7e25707f8c044d5eb30375b28ed33fa46b2091c4d0617bc5eadbfc16fb8406d3
font_01_sfnt_off0001c6ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C6AD 16172 bytes
SHA-256: ccad74ea3f4fa85832adbd5cac52d50dfb6c6d7b6c72f832830c9b13c8f1d4ba
font_02_sfnt_off0001f7e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F7E1 16404 bytes
SHA-256: ba5362732c6493620f61c5a2a497654fee9ffc23c60f48a170db5a300bd7b3bc

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