Malicious PDF — malware analysis report

Static analysis result for SHA-256 342ca780a6b76779…

MALICIOUS

PDF

85.8 KB Created: 2021-04-13 11:41:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e39e9bfd8724aa9aeead7ba13893c851 SHA-1: 63fd95763115ff4cf03cbdc583c3a1974c94b242 SHA-256: 342ca780a6b76779a38beea6ba1ad55d73cabbecbf246afbc984c85ddcea3f08
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic flagging it as a 'PDF_SEO_LINK_FARM'. One of the primary external links, 'https://seumenha.ru/strik?utm_term=mypin+ta4+ssr+controller', is suspicious and likely leads to a malicious site. The ML classifier and ClamAV also strongly indicate maliciousness, consistent with a phishing or malware distribution attempt.

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://seumenha.ru/strik?utm_term=mypin+ta4+ssr+controller
    • http://mekozeka.66ghz.com/responsibility_matrix_template_word.pdf
    • https://xaxafojub.weebly.com/uploads/1/3/0/7/130738676/buxubesopovajaxezu.pdf
    • http://futiwakeso.22web.org/58257862677.pdf
    • http://mitoxewu.22web.org/beethoven_silence_piano.pdf
    • https://bejivuvepezera.weebly.com/uploads/1/3/4/4/134437422/023f29ff.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/6eeb3866-c595-45e7-82e8-ecf86d479cc1/79825100678.pdf
    • https://3175e58c-9db9-4d87-bcb9-15e03531d93d.filesusr.com/ugd/c93210_10bb8b3a382a49b98359d4cad06fabd0.pdf?index=true
    • https://99f4a897-b223-4833-863a-50ad465ba5d5.filesusr.com/ugd/8e2371_42f8ed39a7f14ae1808767d8005f1e6c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d1837ee8-0fdf-48a9-a2cc-2534f57acc64/76697551451.pdf
    • http://rerexewiruved.epizy.com/inorganic_chemistry_notes_for_iit_jee.pdf
    • https://ac263381-fdad-4fda-ae78-6df6d71032d6.filesusr.com/ugd/25c42e_b27c10b9f3e24c3cb46553567c11d5f5.pdf?index=true
    • https://uploads.strikinglycdn.com/files/61625478-6bc2-4dc0-b3f5-980cd131bace/best_roomba_for_hardwood_floors_and_rugs.pdf
    • https://uploads.strikinglycdn.com/files/9e7186eb-49a2-451d-8e74-87e3c772b7e3/what_is_the_best_oil_for_a_briggs_and_stratton_engine.pdf
    • https://uploads.strikinglycdn.com/files/281fe276-c966-4f84-a149-504977fd8d9d/66834050670.pdf
    • https://uploads.strikinglycdn.com/files/b606e65e-e871-4125-8fc0-7ce155f38b1f/nuxeturonufemu.pdf
    • http://purofix.epizy.com/bugupizevonewepafutuvow.pdf
    • http://joriboka.epizy.com/vizio_e48-c2_lost_remote.pdf
    • http://bitesokilok.epizy.com/neporu.pdf
    • http://bidexegope.epizy.com/lapikunilalokiv.pdf
    • https://uploads.strikinglycdn.com/files/75a87b13-86a0-424c-90a1-0ef1c9bbc16a/3478414258.pdf
    • https://44eeb0f0-4dc9-4d8b-b3fd-cc7ace98e90e.filesusr.com/ugd/a083a1_9cd125a02f654eb5a700c72f40840a30.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2236de31-a10a-4c9b-a43d-ca32dda7cb06/what_is_pre_operative_nursing_care.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_off0001117c.bin
0858a8a6117ee15f9d84336b42f62aae611a9a17da1c3e7fec1de848e1b32e1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1117C 5124 bytes
font_01_sfnt_off00012314.bin
2143b7b2b3a3579ac21d76f81a274fc2eecf2f0b5deb3b6572dd9091514b8bc3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12314 11644 bytes

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