Malicious PDF — malware analysis report

Static analysis result for SHA-256 55997581abdde381…

MALICIOUS

PDF

76.3 KB Created: 2021-03-30 01:13:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b1f31ef5322ae8cecbf761f3ab004df SHA-1: 79bfb39d7267cb2341b6e7126b7c951c681daa94 SHA-256: 55997581abdde3818c7a5e0694521f5218c0b8526d079a19ab39858d3f4fdafd
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with one prominent URL being https://xezojetit.ru/wix?keyword=00+gauges+wire. This suggests a phishing or SEO manipulation attempt. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links indicate malicious intent, likely to redirect users to malicious sites.

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://xezojetit.ru/wix?keyword=00+gauges+wire
    • https://bibixofepo.weebly.com/uploads/1/3/4/2/134235383/e7e8b04be25af3.pdf
    • https://cdn.sqhk.co/rajemaramiw/SF4ajd9/cosmos_possible_worlds_episode_1_watch_online_free.pdf
    • https://cdn.sqhk.co/bafuberudod/iOgjZjc/32595362273.pdf
    • https://cdn-cms.f-static.net/uploads/4371248/normal_6034072aeab87.pdf
    • https://cdn.sqhk.co/walekikem/gSjahfr/anime_d._note_stickers_for_whatsapp.pdf
    • https://static.s123-cdn-static.com/uploads/4478422/normal_6008f30dd8946.pdf
    • https://labekefetimobu.weebly.com/uploads/1/3/0/7/130739294/lejutoburuxuv_novuzezaj_juwobalaxigi.pdf
    • http://vexetifiridik.mypressonline.com/chicco_keyfit_30_stroller_car_seat_combo.pdf
    • https://cdn.sqhk.co/lisesemafo/hfYHn2p/g_tasks_todo_list_task_list.pdf
    • http://rijewomel.scienceontheweb.net/warhammer_40k_officio_assassinorum_codex.pdf
    • https://cdn.sqhk.co/bovutolomevo/gFqvieO/battle_simulator_games_ps4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fedufiporara/saniruwuzowurenelunuw.pdf
    • https://s3.amazonaws.com/mubemutolewe/xml_format_validation_java.pdf
    • http://nopawalaxuwaw.onlinewebshop.net/portrait_of_king_james_1745.pdf
    • https://uploads.strikinglycdn.com/files/4ce3ad0e-37ad-49ef-bcf2-f0d9f6d9b719/75971796544.pdf
    • https://uploads.strikinglycdn.com/files/4c61e1bb-565a-420d-a293-0f76df9b1895/vogalubonasigosabigowu.pdf
    • https://s3.amazonaws.com/legesiliv/39063946774.pdf
    • https://uploads.strikinglycdn.com/files/96f932bb-54d7-4c98-9d44-9a55525ce583/yoga_dog_bookends.pdf
    • https://uploads.strikinglycdn.com/files/77e826af-a87f-40b5-9f1c-9eeb061f49c6/how_to_get_lsu_parking_pass.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_off0000ee03.bin
b76a04593ff1deae168a1fa6e0b16b441e462c067d1844f1164fa22f6f0f2045		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE03 4960 bytes
font_01_sfnt_off0000fefe.bin
2521515c478a3b57886cc4d343072a40219447810ccbc74a33e184221a4280c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFE 10952 bytes

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