Malicious PDF — malware analysis report

Static analysis result for SHA-256 e13e96f7dfc02670…

MALICIOUS

PDF

82.3 KB Created: 2021-02-27 11:54:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3a8b6a3ab880638f80a993bec6957e7b SHA-1: c270d50aaea42c19f9eb63ac244386c3e6b3435a SHA-256: e13e96f7dfc0267047cd703b46aeb0db101fc11e8b72ebfdc2cb13e28e8f9bb1
134 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, indicating a link farm or phishing lure. ClamAV detection and ML classification strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards it being used to redirect users to potentially malicious websites, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nipisod.ru/wix?keyword=diffusion+worksheet+gcse PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4421339/normal_6000592612907.pdfIn PDF document text
    • https://gobajirosalafos.weebly.com/uploads/1/3/5/3/135392744/nejubiregarika_gumumuw_xafitepe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391915/normal_6017174353aff.pdfIn PDF document text
    • https://cdn.sqhk.co/javomekoru/ezimhh6/wufowozidunusu.pdfIn PDF document text
    • https://cdn.sqhk.co/munuluxel/8pdWRAy/brimming_synonyms_words.pdfIn PDF document text
    • https://rajevolid.weebly.com/uploads/1/3/0/8/130813967/1682527.pdfIn PDF document text
    • https://sexevegafuxa.weebly.com/uploads/1/3/6/0/136083832/9729699.pdfIn PDF document text
    • https://cdn.sqhk.co/fubafonu/bpoiji5/lock_screen_password_patterns.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482399/normal_5fcc209f47deb.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/mixanaz/bhai_thakur_movie.pdfIn PDF document text
    • http://muropep.epizy.com/pigumopurituviwure.pdfIn PDF document text
    • https://s3.amazonaws.com/wulagisi/64411646080.pdfIn PDF document text
    • http://lukegijabezul.rf.gd/english_grammar_articles_worksheet.pdfIn PDF document text
    • http://mubadel.epizy.com/don_t_stop_believin_sheet_music_free.pdfIn PDF document text
    • http://gefexusutem.epizy.com/construction_company_balance_sheet.pdfIn PDF document text
    • http://gogidovegesoxe.epizy.com/banipulevabesufuwik.pdfIn PDF document text
    • https://s3.amazonaws.com/begijufadi/67946605836.pdfIn PDF document text
    • https://s3.amazonaws.com/tonisefoteka/24020041559.pdfIn PDF document text
    • http://jarawujutuva.epizy.com/clasificacion_del_derecho_privado.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AC 5056 bytes
SHA-256: 743e0dcbcbd80d315fd83f382ff1ebfc31cc1f04228cf33ea526dfb8b9038218
font_01_sfnt_off00010406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10406 10192 bytes
SHA-256: 33d78b7d2a6f91a86ae15f8730b94f983bf23ce27b6377af9e42c0470b2562ec
font_02_sfnt_off0001272d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1272D 16088 bytes
SHA-256: ba49a359edda73fb432b2118eee43e8681603f6c6f845ef214af08c3a95321db

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