Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbf03df1352a65d7…

MALICIOUS

PDF

83.4 KB Created: 2021-06-10 06:30:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 23edc49dcc7b37adb0272a30f731a715 SHA-1: 5136eff47023e64871cd73327cabd0c5f6a1ff74 SHA-256: dbf03df1352a65d746df25c053cc53576e47d4b6d2a081f1c32ceb333ce1c5f6
186 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ML classification and ClamAV, indicating malicious content. It contains numerous external links, with one prominent URL pointing to 'smidgel.ru', suggesting a phishing or malware distribution attempt. The presence of embedded links and the nature of the heuristics (link farm, SEO link farm) indicate an effort to direct users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://smidgel.ru/pbw?utm_term=editable+business+model+canvas+powerpoint+template PDF link annotation
    • https://panenojaro.weebly.com/uploads/1/3/4/4/134482399/62d204b.pdfIn PDF document text
    • https://mamunazeve.weebly.com/uploads/1/3/0/8/130814121/5456020.pdfIn PDF document text
    • https://rivixemip.weebly.com/uploads/1/3/4/6/134609840/sepogifafeg.pdfIn PDF document text
    • https://bunogijadijis.weebly.com/uploads/1/3/4/8/134896562/wunoderidifuv-zererito-rurovisosekikux.pdfIn PDF document text
    • https://sizomarep.weebly.com/uploads/1/3/4/6/134660226/mowajulepete.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wimarolos.pbworks.com/w/file/fetch/144501726/phim_108_anh_hng_lng_sn_bc_tap_38.pdfIn PDF document text
    • http://nosiravuga.pbworks.com/w/file/fetch/144578121/basketball_stars_mod_apk_1.27.01.pdfIn PDF document text
    • http://negovijalulu.pbworks.com/w/file/fetch/144412272/how_to_hack_asphalt_9_on_android.pdfIn PDF document text
    • http://gomedaj.pbworks.com/f/namogaxotemigega.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e81f6c0-69d8-44bd-a79e-066470eb9280/planeacion_de_educacion_fisica_primer_grado_secundaria_nuevo_modelo_educativo.pdfIn PDF document text
    • http://jukozatixul.pbworks.com/w/file/fetch/144703578/irony_as_a_principle_of_structure.pdfIn PDF document text
    • http://negovijalulu.pbworks.com/w/file/fetch/144999618/mortals_feat_laura_brehm_mp3_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47ef0678-bfe3-4a02-92bf-99e55146be69/10-11.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8975da03-5194-408c-bf7d-a45f0ffbcd83/xelasefimafakodeveturogi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03ec01c7-ee92-4365-af82-957d352d439b/wusilisajek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e76f10ae-2e0f-4d71-bfa8-6b052356c026/libro_la_culpa_es_de_la_vaca_3_gratis.pdfIn PDF document text
    • http://duziruromeja.pbworks.com/w/file/fetch/144653337/contrato_de_arras_confirmatorias_peru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae3e7532-1456-48ea-921b-54a5c98ad756/11712823517.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4642bf22-1e44-4625-95ef-5a4e5e2ff35f/how_to_reassess_your_chess_barnes_and_noble.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ffe6dc0-b636-4a37-a2e3-738b73c25672/3989804712.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/962c48d4-25ab-4e40-9804-8d052ff86f65/new_super_mario_bros_game_boy_advance_rom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9d9efe3-b79d-4881-ace3-c184a6537cac/ghost_boy_chapter_1_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45884578-7410-46c8-bc56-b45398ec37cf/toto_sw203401_elongated_c100_washlet_installation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc6c4582-1ac2-45c5-84e6-6668be0e34de/38913653386.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc855b41-7b86-42b4-aa36-86bcfd9b234b/toshiba_ct-90302_how_to_program_dvd_player.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a39017e-dfee-43a5-a4cf-2a2677714bb2/50628691099.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_off00010752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10752 5468 bytes
SHA-256: 0fd784de34470da04446c213739a0cb8915c9397e94faf644f5777254dfd9ae5
font_01_sfnt_off000119e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E6 11464 bytes
SHA-256: bd7f52124382cba5f2d3ef86381de9f39afb6682a702961eb35fe910d8da5169