Malicious PDF — malware analysis report

Static analysis result for SHA-256 e913f5fbfa81e942…

MALICIOUS

PDF

74.3 KB Created: 2021-03-17 08:40:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d2e3d060ebf23c8220ca33c6c58af94f SHA-1: d3fc785ec638260cc9355a614aa4cee7b48860f6 SHA-256: e913f5fbfa81e942760d335d4e0d5ab2864228635ad022327a659a8c9fa90f51
96 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to 'dafemum.ru/award', suggesting a lure to trick users into downloading further malware. The document body, though heavily obfuscated, appears to contain metadata related to air pollution and PDF generation, likely serving as a pretext for the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://dafemum.ru/award?keyword=air+pollution+pdf+download
    • https://cdn.sqhk.co/wiwuwigo/AjbGsig/munijomutegipipowe.pdf
    • http://manuximaxemeje.scienceontheweb.net/deziwuvebu.pdf
    • https://static.s123-cdn-static.com/uploads/4425492/normal_5fe43451ea9a3.pdf
    • https://cdn-cms.f-static.net/uploads/4378151/normal_60431a314210b.pdf
    • https://cdn.sqhk.co/zezinojox/2KZg6hi/fawitokujomir.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/0f15226e-050a-40b5-9f3d-102bed49b975/story_of_your_life_lyrics.pdf
    • https://uploads.strikinglycdn.com/files/54713f1d-6fc7-474d-9e5a-30fc70ef5b3d/the_death_of_the_author_roland_barthes_citation.pdf
    • https://uploads.strikinglycdn.com/files/4e30eb3b-fd7e-46c2-bf3c-07bdb09baa76/combining_like_terms_and_simplifying_expressions_worksheet.pdf
    • https://uploads.strikinglycdn.com/files/b934010a-c5ed-45eb-b31d-5e74f7de91a4/27683284987.pdf
    • https://uploads.strikinglycdn.com/files/4d963d4c-00b6-4bcd-b8c9-4d670e07a815/how_to_reset_kenmore_dishwasher_model_587.pdf
    • https://uploads.strikinglycdn.com/files/8c8e0b7f-72b8-4ab9-96fc-7938d2c1f092/48553069575.pdf
    • https://uploads.strikinglycdn.com/files/0db3af09-49be-43e4-873b-8dd31de66a78/what_does_the_word_vacuum_mean.pdf
    • https://uploads.strikinglycdn.com/files/a13fe492-fe01-4d53-b2c9-483391d07646/what_is_a_case_summary_legal.pdf
    • https://uploads.strikinglycdn.com/files/de03f090-2375-4bf9-8ded-6eaeaf107ddb/do_roku_sticks_have_bluetooth.pdf
    • https://uploads.strikinglycdn.com/files/78b0197c-b2de-403c-a1bb-677176fa3017/dumavukuxeludolexuludafeb.pdf
    • https://uploads.strikinglycdn.com/files/c398abb8-5f40-4d8a-924b-c8bb4f03cad2/why_use_a_pie_chart_to_present_data.pdf
    • https://uploads.strikinglycdn.com/files/6788c073-4a78-443e-9898-5ca083317417/how_do_i_resync_my_summer_infant_monitor.pdf
    • http://forojiwimudobo.atwebpages.com/john_deere_tractor_cover_home_depot.pdf
    • https://uploads.strikinglycdn.com/files/98dfad7e-cb0f-4ece-bdf0-dc382de99051/tus_zonas_erroneas_resumen_por_capitulos.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dac6.bin
b3177c8de935bf2e05ba58035bb430970af2c83108b60a2dfb12b0772094c699		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC6 2912 bytes
font_01_sfnt_off0000e521.bin
7d85fdd1aedb6d940ebccc6da05b9d59d00bf88617aa03204dc701c5fadfbcef		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE521 4936 bytes
font_02_sfnt_off0000f60f.bin
cd60abe99695f3b061ea55e7ed0457836125bc257df77706cd3723651548c54d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF60F 11000 bytes

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