Malicious PDF — malware analysis report

Static analysis result for SHA-256 66309ea1218a0bbd…

MALICIOUS

PDF

75.2 KB Created: 2021-03-21 20:53:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: d3c352567d2e77f5e712e4c220d0e089 SHA-1: 1253fabc08b030d0de4e17d1fec36a24e0006534 SHA-256: 66309ea1218a0bbdf97a0cd6f3e473a1168205fb910bd2e4c75bb53adcdf9d08
156 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. One of these links, 'https://vilenefex.ru/strik?utm_term=historia+del+derecho+romano+germanico', is flagged as an external URI. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or a link farm designed to redirect users to malicious content. No scripts were extracted, but the structure and embedded links point to a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://vilenefex.ru/strik?utm_term=historia+del+derecho+romano+germanico PDF link annotation
    • https://cdn.sqhk.co/potasuregoz/CvCjcJA/somejotede.pdfIn PDF document text
    • https://cdn.sqhk.co/bisulalu/jssiinq/bawat.pdfIn PDF document text
    • https://cdn.sqhk.co/gatezoru/AZjdibK/camp_island_lake_winnipesaukee.pdfIn PDF document text
    • https://mepapezivodeno.weebly.com/uploads/1/3/0/9/130969154/zorexuxa.pdfIn PDF document text
    • https://wugepazi.weebly.com/uploads/1/3/4/3/134348030/8b88bf58a7a3d.pdfIn PDF document text
    • http://natotakujoriw.iblogger.org/format_carte_de_visite_vistaprint.pdfIn PDF document text
    • https://cdn.sqhk.co/juxezijafoz/zVjeDwT/gacha_life_videos_not_on_youtube.pdfIn PDF document text
    • https://sutowuvo.weebly.com/uploads/1/3/4/6/134685384/pagigiwofideda.pdfIn PDF document text
    • https://sarisakela.weebly.com/uploads/1/3/5/3/135308925/2822708.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://ac734925-007a-49fa-9a6b-2340142042ec.filesusr.com/ugd/ea78e0_1ecc7dee6c284deca602bd6711eb0178.pdf?index=trueIn PDF document text
    • https://f4b9ed98-44c1-44e6-9966-d9817cd43de7.filesusr.com/ugd/9ced5d_b9287034262940eebec93183de5103b2.pdf?index=trueIn PDF document text
    • http://vuminezal.rf.gd/how_to_make_bookmark_in_file.pdfIn PDF document text
    • https://51da6a7d-ee05-4a49-87ee-1b74af3aeb07.filesusr.com/ugd/b80405_d0b2436b0b564f14aaf7a907eee962cf.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zonivezada/wizkid_omalicha_music.pdfIn PDF document text
    • http://lipewax.rf.gd/the_player_of_games_iain_m_banks.pdfIn PDF document text
    • https://s3.amazonaws.com/fulosobezur/best_website_to_free_ebooks.pdfIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/animation_in_powerpoint_presentation_free.pdfIn PDF document text
    • https://s3.amazonaws.com/donake/sally_hansen_airbrush_legs_color_guide.pdfIn PDF document text
    • https://6b5d12f1-3bbc-48af-9ddb-5430d2fe15e7.filesusr.com/ugd/3bf302_7fcabced45f743999e17e115fb1eb29c.pdf?index=trueIn PDF document text
    • https://6f12065f-c45d-410c-b048-6ec23fb2b810.filesusr.com/ugd/02ccf7_1491bf379bc0427baceb0b08879cc1e7.pdf?index=trueIn PDF document text
    • http://dapunujunet.epizy.com/pozifakugamofumokom.pdfIn PDF document text
    • https://s3.amazonaws.com/vigevot/fubinowi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d74e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74E 5100 bytes
SHA-256: bac9186a18a852547e8e457df40d262233ee45f2962c10feb050800d13fc7834
font_01_sfnt_off0000e86f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86F 12824 bytes
SHA-256: 9582259e67eacd18ab759f122ea06fd41fb43274c946a3afbbdcd87d272756de
font_02_sfnt_off00010f2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2B 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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