Malicious PDF — malware analysis report

Static analysis result for SHA-256 679dcbb1be83ab07…

MALICIOUS

PDF

75.8 KB Created: 2021-06-07 18:58:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 96c1422c52f916da1f12ff8342c7b231 SHA-1: e145bfd270d64283bcdceb6cae3d3ab23a025f12 SHA-256: 679dcbb1be83ab07691192085caac123c775fe22948801c16faabea4dbd41d38
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. One of the primary external links points to 'xajibur.ru', which is suspicious. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xajibur.ru/123?utm_term=fonts+for+iphone
    • https://cdn-cms.f-static.net/uploads/4371788/normal_600faa78d9815.pdf
    • https://cdn-cms.f-static.net/uploads/4421062/normal_60bc4096bbde4.pdf
    • https://wuwivuwo.weebly.com/uploads/1/3/7/5/137504369/mimukode_kisofafuzeweduw_teduko.pdf
    • https://musejeruz.weebly.com/uploads/1/3/4/7/134740211/7742821.pdf
    • https://fofonameg.weebly.com/uploads/1/3/4/5/134522304/2158156.pdf
    • https://jevavuxenexek.weebly.com/uploads/1/3/5/3/135351486/zurozaka.pdf
    • https://cdn-cms.f-static.net/uploads/4381978/normal_601089c297664.pdf
    • https://vogitoroxubas.weebly.com/uploads/1/3/0/7/130739894/xulax-fimexoveguzimex-vuxibuj-zekokisekoti.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/70175765-1035-4153-bdaf-5f43b2359ae0/7567770116.pdf
    • http://siruzosu.pbworks.com/f/how_does_implied_volatility_affect_option_prices.pdf
    • https://uploads.strikinglycdn.com/files/230dd5b0-2f79-4b85-a0c7-d3b0e44b4d14/tabla_de_derivadas_integrales_e_identidades_trigonometricas.pdf
    • https://uploads.strikinglycdn.com/files/564309ba-d638-4a52-a554-87d9a2d1b392/87705127061.pdf
    • https://uploads.strikinglycdn.com/files/d98f2e85-955f-403d-8a6e-22ca4126adc8/geometry_chapter_4_test_answer_key_id_a.pdf
    • http://tufukamapaf.pbworks.com/f/find_the_coordinate_vector_of_x_relative_to_b.pdf
    • https://uploads.strikinglycdn.com/files/e1382895-e2bb-4001-befc-3b09b0921b5d/como_sacar_dinheiro_nuconta.pdf
    • https://uploads.strikinglycdn.com/files/08579caf-ad9e-4054-97e2-8dcecd440ab0/who_makes_the_top_rated_refrigerators.pdf
    • https://uploads.strikinglycdn.com/files/c8cda812-a224-48b6-82cd-18b975623bf2/cosco_scenera_next_limits.pdf
    • https://uploads.strikinglycdn.com/files/4dfa264f-d91c-454c-be30-e27700deebb0/gta_sa_doraemon_mod_with_nobita_house_for_android_game_download_apkpure.pdf
    • https://uploads.strikinglycdn.com/files/0923b19c-34e8-4313-9ac8-83569499295a/42214505386.pdf
    • https://uploads.strikinglycdn.com/files/180444ab-c146-4380-90a1-90351ed8bb86/71128472621.pdf
    • http://volikedejefa.pbworks.com/f/the_light_in_the_piazza_sheet_music.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_off0000ed3b.bin
1ce3790044064ebfd76eeda0da724816131efa0fc1e519abe3e2c12159b8f184		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED3B 4700 bytes
font_01_sfnt_off0000fd39.bin
474b0fa53d138ed2aab4c39a0237716009a6a1544f95c1d057fbb225dba35db0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD39 10768 bytes

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