Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0dfc7aadd57dc40…

MALICIOUS

PDF

71.3 KB Created: 2021-03-09 05:41:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c7656d07cee3334aa1dcf3b30d0f4462 SHA-1: c355593fddfd0c40ac90dd0dffefc21e7fab1fef SHA-256: e0dfc7aadd57dc400fb389a7b9322c84e86b1e5cae222534d848a1912a43aaac
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, appears to be a lure related to 'webquest answers', aiming to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://bologen.ru/123?utm_term=the+mongols+in+world+history+webquest+answers PDF link annotation
    • https://cdn.sqhk.co/jomonufo/hiXthig/horizon_behavioral_health_nj_claims_address.pdfIn PDF document text
    • https://cdn.sqhk.co/pikuresob/Eq6NgjX/color_quest_animals_john_woodcock.pdfIn PDF document text
    • http://kuworekokinig.medianewsonline.com/14586865147.pdfIn PDF document text
    • http://lekezoreg.22web.org/stardew_valley_lewis_gift_guide.pdfIn PDF document text
    • http://jixuvofariva.iblogger.org/77313454984.pdfIn PDF document text
    • https://cdn.sqhk.co/wepurodapike/fF7tWmv/play_4_keeps_hoodie.pdfIn PDF document text
    • http://vatidenow.medianewsonline.com/85940487112.pdfIn PDF document text
    • http://jezonikiroka.mygamesonline.org/subtracting_across_zeros_worksheet_answers.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xapitolo.rf.gd/how_do_i_update_my_samsung_tv_software.pdfIn PDF document text
    • https://s3.amazonaws.com/jupevuxirapi/jesarisuduzosixatojuv.pdfIn PDF document text
    • http://nexaware.epizy.com/zulumub.pdfIn PDF document text
    • https://6b52f5a6-db44-4d3e-8337-ab33c729cb13.filesusr.com/ugd/f4de5e_33e61a8aea464af3a20001f18c5281da.pdf?index=trueIn PDF document text
    • http://wukevivetarapu.myartsonline.com/embrace_pet_insurance_claim_form.pdfIn PDF document text
    • http://kalilom.epizy.com/jigiparajiduniz.pdfIn PDF document text
    • https://df9240ce-57b4-430e-a582-521170ca5232.filesusr.com/ugd/10b03a_c39482ed1a604a75ae7b257f2eac8f9a.pdf?index=trueIn PDF document text
    • https://0dc5016f-38c0-4e11-84f4-4717e3ef4ec7.filesusr.com/ugd/4fd84c_4eff83cd8c3d4d859cfdbaa7fb27f3ae.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jeromisixinolib/milady_chapter_5_test_answers.pdfIn PDF document text
    • http://wegazoveg.rf.gd/sundiata_epic_of_mali.pdfIn PDF document text
    • http://gapatija.epizy.com/why_wont_my_hoover_steam_vac_pick_up_water.pdfIn PDF document text
    • http://jebetumupogo.rf.gd/probability_theory_worksheet_3_answer_key.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_off0000d894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD894 5648 bytes
SHA-256: 1cae1aabeb33b47c56d500d435bc9744439edbc02159cbef9f204040573791ae
font_01_sfnt_off0000eba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA4 10600 bytes
SHA-256: 41a5c102849c69f4353124bdcda24d2a21bf3980f7608ca215db671845032a5c

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