Malicious PDF — malware analysis report

Static analysis result for SHA-256 36a11a4f68ba781b…

MALICIOUS

PDF

73.3 KB Created: 2021-04-09 16:24:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13f6ec8e2a928494439b7085571849b6 SHA-1: 80d4153220bb02bde93743e77fe165c0ddafd184 SHA-256: 36a11a4f68ba781ba2f4e7c4048753a42965124e17372d3990c9d2f03f10a6d4
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The primary URL, 'https://resalured.ru/strik?utm_term=msi+h81m-e33+drivers+audio', appears to be a lure for downloading drivers, which is a common tactic for distributing malware. No scripts were extracted, but the PDF structure and numerous external links point towards exploitation or redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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
  • 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://resalured.ru/strik?utm_term=msi+h81m-e33+drivers+audio
    • https://fotiterik.weebly.com/uploads/1/3/5/3/135328456/vasulukatofaxaj-tufazovizikusox.pdf
    • https://cdn-cms.f-static.net/uploads/4380229/normal_601b39b7d3c12.pdf
    • https://xikematevi.weebly.com/uploads/1/3/4/3/134392378/6134126.pdf
    • https://dotanivim.weebly.com/uploads/1/3/4/7/134705276/6116101.pdf
    • http://nixekagog.22web.org/bose_ae2_bluetooth_receiver.pdf
    • https://sujujawajiz.weebly.com/uploads/1/3/5/9/135964945/balima-satewixufuwe-noluwodufamiji-rasojagapi.pdf
    • https://cdn-cms.f-static.net/uploads/4368503/normal_6027bb831b6e2.pdf
    • https://lalidusuferub.weebly.com/uploads/1/3/4/4/134440540/sobawesax.pdf
    • https://vemenujobife.weebly.com/uploads/1/3/5/3/135399872/puzujekev.pdf
    • https://kokazokurazafan.weebly.com/uploads/1/3/5/3/135348127/koruni.pdf
    • https://static.s123-cdn-static.com/uploads/4426416/normal_6001d6a97946d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://gewagopixinilu.rf.gd/efficient_electrical_systems_design_handbook.pdf
    • https://s3.amazonaws.com/rodakarugupoko/zozebomagilazas.pdf
    • http://koburolamugalo.rf.gd/bleacher_report_app_state.pdf
    • https://uploads.strikinglycdn.com/files/67b198f6-75c2-4719-9585-1db15de1937c/how_do_you_make_pizza_dough_in_a_bread_maker.pdf
    • https://uploads.strikinglycdn.com/files/831f9a66-a745-40a1-99f1-283553d899fe/pejibixinopofejokitisu.pdf
    • https://uploads.strikinglycdn.com/files/cebc382e-b5f8-4be7-b10c-222aca636a1b/duluv.pdf
    • https://uploads.strikinglycdn.com/files/804b7d7e-5828-460a-aa3c-210e9c8c2569/what_is_a_disadvantage_of_solar_thermal_systems.pdf
    • https://s3.amazonaws.com/lezerawe/flow_cytometry_guide.pdf
    • https://s3.amazonaws.com/napoledunadigo/46221247910.pdf
    • http://pinixivula.epizy.com/asmaul_husna_tamil_meaning.pdf
    • https://s3.amazonaws.com/wonumafubij/fusukotonive.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_off0000dc56.bin
e99f9b7a0ec395ce08a813f92130edba8c59a93bfacb336b1a5528a776814d16		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC56 5540 bytes
font_01_sfnt_off0000ef20.bin
0544487941f8c1b56c07f6b79ee97849957d9f1e9fac0f6d357b371f79386173		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF20 11392 bytes

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