Malicious PDF — malware analysis report

Static analysis result for SHA-256 3906dd238809ab0c…

MALICIOUS

PDF

86.5 KB Created: 2021-03-08 22:29:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 3f1a7157bf0bce54e0412efcc6bb85bd SHA-1: 2e7c5ca102b432ff7e9310b5ac3a8ea6e5148444 SHA-256: 3906dd238809ab0c603d089e3382a80834581b3afabc94859218da21775a0d2e
154 Risk Score

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. It uses a callback-phone (TOAD) lure and an urgency-based lure. 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 0.9955

Heuristics 7

  • 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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://crophysi.ru/123?utm_term=it+security+incident+report PDF link annotation
    • http://gibelineg.sportsontheweb.net/elder_scrolls_v_skyrim_special_edition_prima_collectors_guide.pdfIn PDF document text
    • http://kosamaritaj.getenjoyment.net/anatomy_for_sculptors.pdfIn PDF document text
    • http://vupojijodo.iblogger.org/bepolunamuxanesejov.pdfIn PDF document text
    • http://wepijafiguwenan.mywebcommunity.org/78907860356.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/rupatojuko/nasewaxun.pdfIn PDF document text
    • http://jabodegodonirad.atwebpages.com/lord_of_the_flies_study_questions_chapter_8.pdfIn PDF document text
    • https://e4fb9bf1-a3d6-4767-9bf2-2a1021e5dc09.filesusr.com/ugd/53cfc7_d1c745e8e30b49c8a5a7489809a8b34e.pdf?index=trueIn PDF document text
    • http://ketafek.epizy.com/82288938171.pdfIn PDF document text
    • https://s3.amazonaws.com/gisujubolidine/fitagidize.pdfIn PDF document text
    • https://ee60c613-3dd1-430d-b711-08e3dcbf0273.filesusr.com/ugd/19ce5d_297d4e6d8f0e4c1c9fa6509b2a7a63ff.pdf?index=trueIn PDF document text
    • http://wofaketizezoja.epizy.com/all_my_life_krezip_sheet_music.pdfIn PDF document text
    • http://mopoluganiniru.epizy.com/recipes_for_adrenal_reset_diet.pdfIn PDF document text
    • http://valupakukav.myartsonline.com/how_to_know_if_my_fish_is_male_or_female.pdfIn PDF document text
    • http://deroxemonak.epizy.com/48337508401.pdfIn PDF document text
    • https://459ec6dd-5b69-4322-a182-74abbfaa0e48.filesusr.com/ugd/221eaa_b293853a7db8482b886f83da82c5d65c.pdf?index=trueIn PDF document text
    • https://9cf5cc10-3c2e-4e30-ae6b-73ed7beed88a.filesusr.com/ugd/5c2b46_193c3684c17f46829c207db9e3c2d80d.pdf?index=trueIn PDF document text
    • http://nexuvojof.epizy.com/7111908695.pdfIn PDF document text
    • http://runanuzedajam.rf.gd/cooks_essentials_pressure_cooker_manual_qvc.pdfIn PDF document text
    • https://1094d5c0-a920-47c7-a1de-7e2d56a92d84.filesusr.com/ugd/47b1e8_809f2f1097bf4a2690404dfebbf79370.pdf?index=trueIn PDF document text
    • https://b2f3f1fb-4f3f-4d5d-be65-f5b10dce6288.filesusr.com/ugd/735189_b9a96d8f1e5945e8b62499e2e8888bba.pdf?index=trueIn PDF document text
    • https://dd3528e8-ded0-4753-843e-0d3cb9f542e7.filesusr.com/ugd/4d6844_cf23560ae74a404091c1f9a373d468c9.pdf?index=trueIn PDF document text
    • http://vobisobopimab.epizy.com/79815600248.pdfIn PDF document text
    • https://s3.amazonaws.com/xupizewuxere/causes_of_emotional_and_behavioral_disorders.pdfIn PDF document text
    • https://6e7ef639-f89a-4701-86f9-710a836f1183.filesusr.com/ugd/12745a_b2f9ffdb9ef141cb957add83296709d0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nosepevozux/nojuvasiwajogobojafopi.pdfIn PDF document text
    • https://s3.amazonaws.com/zuguvoxoki/coldest_province_in_canada_today.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A04 4744 bytes
SHA-256: 3d08591d39aa875cbed4d6a750a7d645a85ccf4c408b797ac5d353b8cc5cd33b
font_01_sfnt_off00011a30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A30 10568 bytes
SHA-256: 11f0638ad33b932e4f4f36ada1a0f6bf3ddf56a3fc36ad39b1c37b575aabc0f0
font_02_sfnt_off00013e49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E49 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2