Malicious PDF — malware analysis report

Static analysis result for SHA-256 6591e5040056e298…

MALICIOUS

PDF

112.5 KB Created: 2021-03-23 03:07:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 70e6ae5e4ee3e6ac618e064cbacb3e51 SHA-1: b494d259f5d4ab7bcdb35c297b43a6c0de9b29ca SHA-256: 6591e5040056e2987c0dd2afb33b90277bd0ca2f993fb162b5f57c68f7b9ff8e
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, with several pointing to disposable hosting domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

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://bologen.ru/award?keyword=brick+and+block+masonry+pdf PDF link annotation
    • http://peteferix.mypressonline.com/pdf_to_word_converter_free_download_software_for_windows_8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380078/normal_602ad31fe2427.pdfIn PDF document text
    • https://cdn.sqhk.co/tinodifozeza/ibARjcQ/7182416193.pdfIn PDF document text
    • https://cdn.sqhk.co/gawagunikuw/nghz11I/kuxusinivimavapujulemoje.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408482/normal_602f978a00e71.pdfIn PDF document text
    • http://patedeziw.mypressonline.com/wovuxekatip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384820/normal_6034d2ea9e16f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458431/normal_5fcdb4f65e977.pdfIn PDF document text
    • http://zutolewe.mywebcommunity.org/public_administration_degree_salary_in_south_africa.pdfIn PDF document text
    • https://cdn.sqhk.co/rujiwujik/dBigjjb/steven_universe_attack_the_light_steam.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392656/normal_5fffbe9090f7a.pdfIn PDF document text
    • https://cdn.sqhk.co/kavejufa/iqqjacO/karol.pdfIn PDF document text
    • http://dusikazo.mypressonline.com/solar_mobile_charger_circuit_diagram.pdfIn PDF document text
    • https://cdn.sqhk.co/gupuwiwi/3jgifge/juzupusa.pdfIn PDF document text
    • https://cdn.sqhk.co/tuteremekome/hggMgje/nubiduko.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kedaxesipuwid.epizy.com/wexexoxena.pdfIn PDF document text
    • http://bogalibamadom.myartsonline.com/paris_metro_tube_map.pdfIn PDF document text
    • http://befijipaz.epizy.com/28686218032.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_off0001795b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1795B 5656 bytes
SHA-256: 191ccde506f122ccb3956fc4f8147ec4d5d7cc90a12a0ab768a418a078d050e1
font_01_sfnt_off00018c8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C8D 12800 bytes
SHA-256: f7764a1b4577514ee2a203d65a2a3f42a7647b3c511bea5f8d458b8a6e423b82

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