Malicious PDF — malware analysis report

Static analysis result for SHA-256 cda8aa9ae0ce09c7…

MALICIOUS

PDF

79.6 KB Created: 2021-04-06 18:53:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: abcd77d83be5f7832e943a82e7653f53 SHA-1: 3e8223f3fcdb12414f473453c6f5d5f02ea80037 SHA-256: cda8aa9ae0ce09c7c5b3938adb713df6af21b415a350dd53c1eb8aefccc38171
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, many pointing to disposable hosting or redirectors, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URI heuristics point towards the exploitation of PDF vulnerabilities or the use of embedded JavaScript to redirect users to malicious sites like mezovuduw.ru.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://mezovuduw.ru/strik?utm_term=arturia+minibrute+2+analogue+synthesizer PDF link annotation
    • http://smirnoff-optic.com/how_to_do_long_division_method_in_tamilgk315.pdfIn PDF document text
    • http://prizinsta.online/world_war_1_test_answersjp8er.pdfIn PDF document text
    • https://berarenojinoz.weebly.com/uploads/1/3/4/7/134737003/woleganawufu.pdfIn PDF document text
    • http://canonsburglake.org/547070000278n42v.pdfIn PDF document text
    • http://bbflowers.net/xutivenomuxomipobutrvvw.pdfIn PDF document text
    • http://espaceabonnes.com/rerazezotxo3ic.pdfIn PDF document text
    • http://levantemosaic.com/zuveterafogowasugegowepikxlpc8.pdfIn PDF document text
    • https://sofodifimujinem.weebly.com/uploads/1/3/4/2/134234674/lufug_sonufuzowejo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e639449-471b-46fc-ba51-4d46369c5770/79159231282.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0899fb05-b383-4b3d-b274-143e2b2deb25/gunagubimixebafekokiteduv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae1bb6c9-a043-4578-b686-855c552b59f2/49113627390.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbf9ac1b-78c0-44ea-a656-557785ebdeb2/numerical_recipes_in_fortran_90.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec6226bf-2759-4eb3-9a39-9aa147a387f6/cuantos_galones_tiene_1_metro_cubico_de_agua.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88e34574-b194-4504-a462-06d5a25e991e/geduxudak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38967299-89fc-4370-a246-2f809c700dd3/how_to_factory_reset_a_panasonic_cordless_phone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac008663-3bd2-4912-96ff-6aaf52d47913/does_instax_mini_film_work_in_polaroid_300.pdfIn PDF document text
    • http://dafitigare.epizy.com/wugokavofoxepedod.pdfIn PDF document text
    • http://gafigozigu.epizy.com/ti-30x_iis_simplify_fractions.pdfIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E4 5512 bytes
SHA-256: e3ead3c426bec02844b82a3815c42fca56b584d32d8d8e3f63fdfffb19fedf56
font_01_sfnt_off00010a85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A85 10916 bytes
SHA-256: d9cce304635f350a5bc06eb99ea0241d4b8076cbd6b10813e1fd004b347a93f2

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