Malicious PDF — malware analysis report

Static analysis result for SHA-256 e84fe258e49b16f2…

MALICIOUS

PDF

89.3 KB Created: 2021-03-21 00:21:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4f94810fc09eccdd351561d229cb0ed1 SHA-1: 90f75dd4e39c1db3ecd27f45567333d5e371f706 SHA-256: e84fe258e49b16f2d1588b52cf9db381e920320c24f3d52015e4014716f62de3
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm, with the primary URL pointing to a search query. ClamAV detected this as a phishing trojan. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, suggesting an attempt to distribute or host malicious content. The presence of embedded URLs further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://soxebez.ru/wix?keyword=searching+for+summer+comprehension+questions+and+answers
    • http://gifavojam.scienceontheweb.net/canara_bank_account_opening_filled_form.pdf
    • https://cdn.sqhk.co/kelufuro/exHmRjh/joy_box_puzzles_all_in_one_computer.pdf
    • https://cdn.sqhk.co/zapevexuvot/jie7gd9/action_hero_biju_actors.pdf
    • https://gamuzajebi.weebly.com/uploads/1/3/4/4/134481120/laxuxij.pdf
    • https://luwigemo.weebly.com/uploads/1/3/4/5/134597726/xinugoku.pdf
    • https://cdn.sqhk.co/sanojuxako/HjfbMZy/ivory_color_dresses_for_wedding.pdf
    • https://pitimonajavigo.weebly.com/uploads/1/3/1/3/131383860/malabudigu.pdf
    • https://cdn.sqhk.co/fasazani/hgj46hh/43206593060.pdf
    • https://gebapawuvafiv.weebly.com/uploads/1/3/4/5/134519736/8878178.pdf
    • https://fupuvoriru.weebly.com/uploads/1/3/4/4/134494751/aff1a5a47788087.pdf
    • https://cdn.sqhk.co/letaziseb/Ulihija/tiger_king_halloween_costume_couple.pdf
    • https://simepatu.weebly.com/uploads/1/3/4/2/134267103/sejugajuzaronopipi.pdf
    • https://fubuwadedaxas.weebly.com/uploads/1/3/4/8/134897716/bozele_padibitekotakos_jixof.pdf
    • https://wujawosekeg.weebly.com/uploads/1/3/4/7/134712458/duxebanarisaniz-takojiwikun-sazobatimibu-diluxevozijalo.pdf
    • https://xoxopurotawasuj.weebly.com/uploads/1/3/4/6/134651309/c81a7ebc52c.pdf
    • https://sakurulemiba.weebly.com/uploads/1/3/0/9/130969926/roketa.pdf
    • https://nogegomubupof.weebly.com/uploads/1/3/4/6/134614602/ad303.pdf
    • https://cdn.sqhk.co/xuwisagilevi/egigdjf/ethical_hacker_definition_english.pdf
    • https://cdn.sqhk.co/bitulore/jaTr6jf/sutidimudobifutasenufopu.pdf
    • https://risonozolediwar.weebly.com/uploads/1/3/1/3/131398017/55549fa7f9ff77.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fuvuvadut.onlinewebshop.net/business_law_today_the_essentials_11th_edition.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_off00011bb0.bin
4a136b4ad8088ecdfd2e68da637bdf4cf84d59a58978f887e1ee8726c6ff5da2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB0 5860 bytes
font_01_sfnt_off00012f85.bin
d7797e3cc92f582f12c447a493b4539a1ebfdbf7c4bc5a4928b3d0bf4d4816de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F85 11204 bytes

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