Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8d29b9f07956159…

MALICIOUS

PDF

75.6 KB Created: 2021-04-08 10:44:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: ca1b35c717812dc312346064f61b2c36 SHA-1: b0e82c859f822b35b2f54fb72cfee432aca24fa9 SHA-256: a8d29b9f0795615984512917ea329a7100d3bf3489e60295e3ca7dbdc88b37ba
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier and ClamAV also strongly indicate maliciousness. The document body, though heavily obfuscated, appears to contain text related to scheduling a driver's test, suggesting a lure to trick users into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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/strik?utm_term=how+to+schedule+my+drivers+test+mn In PDF document text
    • https://cdn-cms.f-static.net/uploads/4492915/normal_6013c3d848b43.pdfIn PDF document text
    • https://botuwuroxawezu.weebly.com/uploads/1/3/4/7/134713501/08a0e15.pdfIn PDF document text
    • https://segamovav.weebly.com/uploads/1/3/4/8/134892249/vekuvesi-wovawebipe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370317/normal_5fdd8b73b11e3.pdfIn PDF document text
    • https://vorimebexefup.weebly.com/uploads/1/3/5/9/135960379/dunapi-sujixibofomutag-suzawudorap-timuxoperiw.pdfIn PDF document text
    • https://xixebume.weebly.com/uploads/1/3/0/9/130969831/65407b2db096a58.pdfIn PDF document text
    • http://nubilofanekib.mygamesonline.org/rojeb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374542/normal_5ff476412f748.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379961/normal_5fd11766ea764.pdfIn PDF document text
    • https://sivobevabe.weebly.com/uploads/1/3/4/6/134665070/926df0.pdfIn PDF document text
    • https://kedigijolaga.weebly.com/uploads/1/3/4/3/134331451/8378835.pdfIn PDF document text
    • http://melifalafijuz.22web.org/82109179465.pdfIn PDF document text
    • http://bidetoluji.getenjoyment.net/service_catalogue_template.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488135/normal_606558525b98f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fozubada.rf.gd/uncle_ato_audio_songs_free.pdfIn PDF document text
    • http://radujexoxetapil.epizy.com/a_dripping_marker_font_free.pdfIn PDF document text
    • https://s3.amazonaws.com/gafedupeba/balarama_digest.pdfIn PDF document text
    • https://s3.amazonaws.com/jazofi/fojokativeminewurojekedul.pdfIn PDF document text
    • https://s3.amazonaws.com/kewakuko/what_do_the_aliens_want_in_war_of_the_worlds_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/leributafa/plague_inc_cheat_codes_android.pdfIn PDF document text
    • https://s3.amazonaws.com/lepefi/rossi_92_parts_diagram.pdfIn PDF document text
    • http://mojunefasuxew.rf.gd/7976554226.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_off0000ecdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDD 5184 bytes
SHA-256: f467623521b7b93d2b03a22e068bc997b6f9ed8ccf2bc8adc9b77223fcad3bc6
font_01_sfnt_off0000fe6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6B 10068 bytes
SHA-256: 38a8b92006c4abe0e2f6f85a4844f675206fbdb8cb61efddf33ff9b8facaa068

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