Malicious PDF — malware analysis report

Static analysis result for SHA-256 af78999e0376307d…

MALICIOUS

PDF

76.7 KB Created: 2021-03-13 19:50:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: c953005d05c2de85c186e396c2e9bc50 SHA-1: e67733c88a1c884930d301de90d13e8d919fdb14 SHA-256: af78999e0376307da777e01e884e8709935650297fc26336a2891a172b266920
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. It contains numerous external URIs pointing to various domains, suggesting an attempt to redirect users to potentially malicious content or phishing sites. The PDF structure and embedded links are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://jottigo.ru/award?keyword=public+administration+and+management+in+south+africa+pdf+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4471467/normal_60480119e3464.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475380/normal_5fdbce063c1d7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383804/normal_5ff63abb6fa4f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450864/normal_5fd218c0d4fd6.pdfIn PDF document text
    • http://livetajo.22web.org/gana_sudhakar_ambedkar_song_masstamilan.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410216/normal_5fcbdc2b0335e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405194/normal_604189ac95745.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418786/normal_5ffe9018432e3.pdfIn PDF document text
    • http://xevokegejir.iblogger.org/cisco_ipsec_vpn_client_windows_7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422622/normal_5ff22ab755330.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388050/normal_600527a3c39c9.pdfIn PDF document text
    • http://lefijuf.iblogger.org/bodybuilding_workouts.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369928/normal_6013b6615cc5c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zebofazedixa.rf.gd/tukazenawunuxerijovo.pdfIn PDF document text
    • http://lomiwolidosin.rf.gd/denuwa.pdfIn PDF document text
    • http://zawuzujuw.epizy.com/34741464714.pdfIn PDF document text
    • http://zemadepa.rf.gd/calvin_klein_bra_size_guide_uk.pdfIn PDF document text
    • http://kititone.epizy.com/elastic_collision_in_two_dimension_derivation.pdfIn PDF document text
    • http://wuzisop.epizy.com/lesitabo.pdfIn PDF document text
    • http://soxosodazafu.epizy.com/father_s_day_handprint_poem_template.pdfIn PDF document text
    • http://pebuvow.rf.gd/gy-_521_accelerometer_datasheet.pdfIn PDF document text
    • http://zadiriza.rf.gd/bebas_font_family.pdfIn PDF document text
    • http://voratibix.rf.gd/gesajusolovorifenogizuze.pdfIn PDF document text
    • http://gamovomubapo.rf.gd/86197241549.pdfIn PDF document text
    • http://nupakavidowux.epizy.com/punopel.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_off0000eaa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA0 5800 bytes
SHA-256: 7f56d8832af7d36461bb45ad4271f22f9aff0d6a0560679ccf147f46d5b01f1a
font_01_sfnt_off0000fe41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE41 10880 bytes
SHA-256: dd1b46b94d404b97acb8cf9a9e664486b3b89a2f21d5bfb3f6c4d10b574b6138

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