Malicious PDF — malware analysis report

Static analysis result for SHA-256 015fe42995f66fea…

MALICIOUS

PDF

72.9 KB Created: 2021-02-21 16:40:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5955f568f59f0537048e66a5a015fcea SHA-1: 867b3f1f1daa5f54da671bd89b02199e7e4fc03f SHA-256: 015fe42995f66fea58af1d9f2ad73aca003cfba6cd1c3c798034b6f2b1b40fb1
126 Risk Score

Malware Insights

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

The PDF document is identified as malicious by ML classifiers and ClamAV, and contains numerous embedded URLs. The document body, though heavily obfuscated, suggests a lure related to 'Yamaha rx-a1040 specs'. The presence of multiple links to disposable domains and link farms indicates a phishing or redirection attempt to malicious sites. No scripts were extracted, but the PDF structure and embedded links are indicative of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/wb?keyword=yamaha%20rx-a1040%20specs PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4487432/normal_5fd73cc6ef395.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452169/normal_602ca8c3aa72c.pdfIn PDF document text
    • https://cdn.sqhk.co/kogoruzojif/Kkr7zhj/best_recharge_for_jiofi.pdfIn PDF document text
    • http://cancandance.org/what_management_skillsoxopc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370744/normal_5ff7a12e43907.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372721/normal_5fdff47b53dfd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383695/normal_5fe31c849a18d.pdfIn PDF document text
    • https://cdn.sqhk.co/jujadiziga/mhdXzcI/infective_endocarditis_diagnosis_and_treatment.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370078/normal_5ffd446c91df0.pdfIn PDF document text
    • https://cdn.sqhk.co/manuguwe/dtDjhic/rpg_record_of_agarest_war_zero_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/gefimiwotux/NkeheY9/pass_with_flying_colors_idiom.pdfIn PDF document text
    • http://romeita.fun/48942447448lecgb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dupumimegijema.epizy.com/gilukazadab.pdfIn PDF document text
    • http://talaxapu.epizy.com/18757204542.pdfIn PDF document text
    • http://bawokexumavi.epizy.com/druids_glen_golf_course_guide.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_off0000e0fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FE 5484 bytes
SHA-256: d39114d43855c487dc4b4892b77206ef9ea6ff236302941ea276b609cf44c246
font_01_sfnt_off0000f38f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38F 10368 bytes
SHA-256: d9b104938b86ee52708d4672ea032c3ddd8b37196eeda63b655bd377efb17f65

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