Malicious PDF — malware analysis report

Static analysis result for SHA-256 12f00327b80360f6…

MALICIOUS

PDF

78.5 KB Created: 2021-03-06 14:54:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: a43f57b5cce16ae5566183c5f09e3ee9 SHA-1: 78d4074f37241848ceae91a6f7fa1a1333b34201 SHA-256: 12f00327b80360f652c3ef2cef973857cbe014df3d98bc831a6aaf68c7b1abc3
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm designed to redirect users, and the primary URL suggests a lure related to personal statements for medical school. While no scripts were explicitly extracted, the presence of external URIs and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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/strik?utm_term=personal+statement+for+medical+school+examples PDF link annotation
    • http://coupons2020.info/815206194958xb57.pdfIn PDF document text
    • http://liketime.online/learn_english_grammar_free_course8wlef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407066/normal_5fd266436d1ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381320/normal_6031d65fb731b.pdfIn PDF document text
    • http://zotikarida.medianewsonline.com/bikez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504568/normal_600c83b7178a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461204/normal_6041f0ef2dd3a.pdfIn PDF document text
    • http://mizafaroremida.getenjoyment.net/bissell_powerforce_helix_turbo_bagless_vacuum_2190_belt.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403429/normal_5fec672dd64be.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416786/normal_5fe4636eb3696.pdfIn PDF document text
    • http://losqutoq.online/excel_betinget_formatering_formelpaw8q.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469358/normal_6005d9233dbf8.pdfIn PDF document text
    • http://hangzhoumetal.ru/daphne_du_maurier_rebecca_amazon.caqj3ku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374983/normal_6039d7fc5bbb3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450731/normal_60121a47113a4.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/galinikagopit/spectrum_cable_tv_guide_cleveland_ohio.pdfIn PDF document text
    • http://velidukaka.epizy.com/dakovepuminizoripixuw.pdfIn PDF document text
    • http://taribizuka.epizy.com/97218083904.pdfIn PDF document text
    • https://s3.amazonaws.com/pesetufavo/zarexegebujedelorunigunu.pdfIn PDF document text
    • https://s3.amazonaws.com/jixeremipet/berowigabaxiw.pdfIn PDF document text
    • http://kawugugo.epizy.com/dotelemetobezodap.pdfIn PDF document text
    • http://pibejonegipe.rf.gd/why_did_the_middle_colonies_have_a_diverse_population.pdfIn PDF document text
    • https://s3.amazonaws.com/sonutopexaramuf/phenolic_resin_sheet_canada.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_off0000f665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF665 5464 bytes
SHA-256: 3aeddcb1dc4ed48430273c32febd2db3f4dc7a518f81b8c0ded5801a493fdefd
font_01_sfnt_off000108d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D6 10272 bytes
SHA-256: 82ccdda7aff0c51c72f091d56c25a88e6d88c0cb4bf08733a4710eff1b12b307

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