Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7c418670b9c73ed…

MALICIOUS

PDF

72.9 KB Created: 2021-02-27 09:05:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 90c85974cb9c9fe7c657cbdbd7400850 SHA-1: 939601362a988e40b23fb1fa7b03a67e4e2667e2 SHA-256: e7c418670b9c73edb22a371a36e9502fae7faf29121ccb41cf8dba9b1ddaa1ae
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or redirection campaign, likely using JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://maypoin.ru/123?utm_term=white+christmas+tree+decorated+in+red+and+black PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4391896/normal_5fdfd11bd374d.pdfIn PDF document text
    • http://greyfruit.space/44614799524qk974.pdfIn PDF document text
    • http://shishkin-seed.xyz/heuristic_evaluation_templategszzi.pdfIn PDF document text
    • http://handler-autoscout24.com/lisanavunavebon8ng76.pdfIn PDF document text
    • http://voiprormul.xyz/mind_over_moodey0sr.pdfIn PDF document text
    • http://drovazvenigorod.ru/what_are_the_types_of_organizational_structures_briefly_explain_each9noy7.pdfIn PDF document text
    • http://grizhoff.ru/aiff_full_form_in_computer0ld2a.pdfIn PDF document text
    • http://homearfes.com/http_android_go_edition_phones_in_nigeriar26kq.pdfIn PDF document text
    • http://propovar.ru/45297627437ff9z2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408719/normal_5fc8b86b2d934.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445866/normal_601ad4bf462f7.pdfIn PDF document text
    • http://vehicleinsusa.com/presentation_rubric_template8rqej.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sisaxu/79552930518.pdfIn PDF document text
    • http://sivutesafukim.rf.gd/adobe_xd_app_templates_free.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_off0000dc5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5B 5396 bytes
SHA-256: a143b34179c2d774118b6add1edd2c353ec46b1cfdb3820e66351235e081a795
font_01_sfnt_off0000ee92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE92 11132 bytes
SHA-256: 48220ab4eb5b310c4c39c445b7aff34ff9b1a29358dd54f57282d25a8735f9cd

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