Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6f5683d230a6f44…

MALICIOUS

PDF

72.8 KB Created: 2021-04-15 18:34:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7f71e78c07dc296177f9dc67127ae468 SHA-1: 9acf5160800193967026a009ebdf023a33a29ed2 SHA-256: c6f5683d230a6f44cbf09f9464637a730bc036c29485887331eb1abffebc996a
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The primary malicious URL identified is 'https://resalured.ru/strik?utm_term=epson+artisan+835+ink+walmart', suggesting a phishing or scam attempt disguised as a search result. While no scripts were explicitly extracted, the PDF structure and link farm indicate an attempt to redirect users to malicious content, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://resalured.ru/strik?utm_term=epson+artisan+835+ink+walmart
    • http://healthytrands.com/9764564284h412y.pdf
    • http://boothattendant.com/solid_state_electronic_devices_streetman_7th_edition_pptk03zf.pdf
    • http://wadixokup.22web.org/66022962099.pdf
    • https://vinebikeja.weebly.com/uploads/1/3/4/7/134712271/niwusozidow-jupevuduxuk.pdf
    • https://wejobufobugof.weebly.com/uploads/1/3/5/3/135348322/dutimafutire.pdf
    • http://romeoplanet.club/vevizevirodujivorexoxenx32c.pdf
    • http://wildber.store/15775957599e6x91.pdf
    • http://keto-menu.online/77038482040d9ok5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d30e1124-27d0-410f-974e-5231d4383841/65749522359.pdf
    • https://uploads.strikinglycdn.com/files/17591aca-de97-442c-8f53-b3a2c2fdff34/why_wont_my_dsi_turn_on.pdf
    • https://uploads.strikinglycdn.com/files/d0fdf723-4a2a-4ed5-922a-407f5dc4d315/22849361672.pdf
    • http://buzetori.epizy.com/unethical_behavior_in_the_workplace.pdf
    • https://uploads.strikinglycdn.com/files/d10ba453-59af-491c-85fc-515edcdcb42f/wesafabodan.pdf
    • http://mafivofadol.epizy.com/gesasalukudadutowudaw.pdf
    • https://uploads.strikinglycdn.com/files/67b8a609-45b6-42bb-8bb4-8fb7e1a103b1/how_to_write_a_fiction_book_synopsis.pdf
    • http://vafatosiwajufo.epizy.com/associao_de_resistores_em_serie_exercicios_resolvidos.pdf
    • https://uploads.strikinglycdn.com/files/24315b15-68ef-4acf-86e0-f3073c58bc13/what_was_the_orange_lightsaber_in_rise_of_skywalker.pdf
    • http://viraxisizix.epizy.com/enigma_otiliei_vol_2.pdf
    • https://uploads.strikinglycdn.com/files/05b5c2f3-2e45-4152-9ca9-b3cf302d5677/resam.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_off0000dd71.bin
3ac7b74728619feb2c73234d5d7c58433f57a1567dc086f81a64415f99a02142		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD71 5560 bytes
font_01_sfnt_off0000f05c.bin
c8679779b99870cca0ae87167588b5064d787939d20612bfe23dac593cf40cae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF05C 11352 bytes

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