Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e5dace1df10cb13…

MALICIOUS

PDF

89.7 KB Created: 2021-04-17 17:27:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 823c03c6f378f80098a3c04a89599975 SHA-1: 455c3d90d9aa0d8d19eb2779e0a22f66e8435b08 SHA-256: 4e5dace1df10cb13b3564ab9d2a5e91be3e1443985ab515e7d5a66b8018ce284
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with critical heuristics identifying it as a malicious redirector and a link farm. The primary malicious URL is 'https://yafferge.ru/strik?utm_term=sato+cl4nx+rfid+manual', which likely leads to a phishing or malware download page. The presence of ClamAV and ML detections further supports its malicious nature, indicating it's a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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://yafferge.ru/strik?utm_term=sato+cl4nx+rfid+manual
    • https://parikijofema.weebly.com/uploads/1/3/1/3/131383717/sesilagasigibek.pdf
    • https://cdn-cms.f-static.net/uploads/4475219/normal_600fb911c15af.pdf
    • http://duromexixupa.iblogger.org/advanced_google_search_operators_cheat_sheet.pdf
    • http://ledukamu.iblogger.org/factors_affecting_soil_erosion_wikipedia.pdf
    • http://torarofuzavu.22web.org/xuvas.pdf
    • https://felelitujafi.weebly.com/uploads/1/3/5/3/135392562/b20c1cccfc.pdf
    • https://cdn-cms.f-static.net/uploads/4418584/normal_6040b7c009001.pdf
    • https://static.s123-cdn-static.com/uploads/4473638/normal_5fe394d36894e.pdf
    • https://static.s123-cdn-static.com/uploads/4486778/normal_5ffa2574d7a9f.pdf
    • https://cdn-cms.f-static.net/uploads/4387411/normal_600f41c31c633.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.thdl.org/http://www.thdl.org/Tibetan
    • https://uploads.strikinglycdn.com/files/51761725-ebbb-44c3-bd5c-49ca9fc399f9/74869492222.pdf
    • https://uploads.strikinglycdn.com/files/86c03023-549d-4e27-aff2-248fb6ec4bc0/bumafijisipigodozatom.pdf
    • https://s3.amazonaws.com/gedexim/41530569045.pdf
    • http://lizuruvabeg.epizy.com/que_significa_ser_lider_de_un_equipo.pdf
    • https://s3.amazonaws.com/dudurat/how_to_set_a_brinks_outdoor_timer.pdf
    • https://s3.amazonaws.com/zosevid/23391403104.pdf
    • https://s3.amazonaws.com/sabobenuwe/35387892515.pdf
    • https://uploads.strikinglycdn.com/files/94aacda8-7a15-4166-a256-781693375023/71698331133.pdf
    • https://uploads.strikinglycdn.com/files/dc3495b5-bbfd-4fa5-a6d8-0142ecf978f0/gowugojenewe.pdf
    • https://s3.amazonaws.com/luxaduzimase/variables_and_expressions_guided_notes.pdf
    • https://s3.amazonaws.com/zumezeviwakiz/52078283787.pdf
    • https://uploads.strikinglycdn.com/files/a56893b2-6bb3-4612-9764-c988a534b812/what_are_the_types_of_images.pdf
    • https://s3.amazonaws.com/sagotomagin/53054820858.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
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.htmlTibetan

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc4e.bin
123153618010d4ef0539824b02b29d2b6d0883cc60e61b97b9e381681eaab2b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4E 4484 bytes
font_01_sfnt_off00010c0e.bin
a9a398fbe0f72e8e3ea94450c2e6831c8a682bc2004f6ace60b080c159272a63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0E 5248 bytes
font_02_sfnt_off00011de0.bin
b18405a7512b54477bfa6371a33606a62d57fac8b73b23a0d352487cc738ee13		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE0 9148 bytes
font_03_sfnt_off00013039.bin
8dcd8ff6db66c691c2d606151ed85774bc4a39e4ec4c668fdb1a1ae6064dc0b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13039 11900 bytes

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