Malicious PDF — malware analysis report

Static analysis result for SHA-256 08571eb13dc2a902…

MALICIOUS

PDF

77.7 KB Created: 2021-03-19 16:24:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0c4dc40bbbf7a2147926f3492a3630f9 SHA-1: 9ad94145c0ab8b1128730824052926fee081a953 SHA-256: 08571eb13dc2a902b68f6cf325dd034102d558926797020958415c927bc3d1d0
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://leonvi.ru/123?utm_term=blackjack+basic+strategy+card+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4417040/normal_5fdf05237d1b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460043/normal_600d97260e953.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445331/normal_60342593124d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501383/normal_6032ee53b57b2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tozaduliwubega/how_to_best_study_for_cfa_level_1.pdfIn PDF document text
    • https://s3.amazonaws.com/zodererezuzuxi/execute_stored_procedure_using_jdbc_template.pdfIn PDF document text
    • https://fb79ad55-22b5-4823-9538-35c71bbbd514.filesusr.com/ugd/ea423f_88b2829037c1487f8537453c52811e62.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lukepepe/doubles_plus_one_worksheet_2nd_grade.pdfIn PDF document text
    • https://e8e87dc5-637d-47ba-9de6-e7d98d123d78.filesusr.com/ugd/a69a03_075fc27eae5944ec899ff087067f92d3.pdf?index=trueIn PDF document text
    • http://gejujebiwibi.epizy.com/beyblade_burst_app_hack_mod_apk.pdfIn PDF document text
    • http://tekunobujolid.epizy.com/vanilla_wow_holy_priest_leveling_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bc2ba71-764f-4a79-a4b8-2ba7ee44ac7f/how_to_do_a_good_interview_presentation.pdfIn PDF document text
    • https://s3.amazonaws.com/pizivurapab/idle_hands_are_the_devils_work.pdfIn PDF document text
    • http://ramapenutizawa.epizy.com/pathology_book_by_harsh_mohan.pdfIn PDF document text
    • https://6acf0ca1-aa41-4771-8b91-54baff69ee7f.filesusr.com/ugd/7d1dc9_7ddaaed6c71344c1910d022733ac602a.pdf?index=trueIn PDF document text
    • http://mupumirupuwanaf.epizy.com/44772386292.pdfIn PDF document text
    • http://paritoxo.rf.gd/guess_the_song_emoji_game_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/negonanopix/40805456224.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa856d91-e400-411e-bdee-2c4849aba257/76348926165.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88a59207-69d7-45fa-8c1c-116568864ebb/95111639226.pdfIn PDF document text
    • https://s3.amazonaws.com/savifin/how_to_set_the_time_on_a_honeywell_thermostat_rth230b.pdfIn PDF document text
    • https://s3.amazonaws.com/gumegulaxi/kodasolawusu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/156cd728-0c7c-4568-99a4-7acf34190d89/how_to_reset_toner_chip_oki.pdfIn PDF document text
    • https://s3.amazonaws.com/xomudufe/cole_parmer_pump_selection_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/waxapoz/union_and_intersection_of_sets_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e90b583f-0939-4c5d-80fe-4d8769d093ce/nordyne_iq_drive_error_codes.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_off0000f085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF085 5752 bytes
SHA-256: d062d87be2a0eeb5373fa8846334af2c368b1c94f7f22c733f6ebc1b23d77f4d
font_01_sfnt_off00010436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10436 10888 bytes
SHA-256: 0e62882bf48f862719257299d92038fd9233cd2de0c08265b37ed132b6c2f466

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