Malicious PDF — malware analysis report

Static analysis result for SHA-256 73f1456f4bfb59fd…

MALICIOUS

PDF

76.2 KB Created: 2021-01-19 17:19:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 19286e0f038fc04bc8a49f263bfbc078 SHA-1: 77e791defe21e7071e8d2d47f2a00dd7ac8bb1c0 SHA-256: 73f1456f4bfb59fd06c0989574ed839b173c92ecdb08d99789ccccf3a4719575
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs, many pointing to disposable domains or link farms, suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a large number of links on low-reputation hosting, reinforcing the malicious intent.

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://traffnew.ru/123?utm_term=auto+flat+rate+manual PDF link annotation
    • https://site-1178617.mozfiles.com/files/1178617/91310278264.pdfIn PDF document text
    • https://dewuvibemezifo.weebly.com/uploads/1/3/4/7/134763410/majunuli.pdfIn PDF document text
    • https://site-1176507.mozfiles.com/files/1176507/secret_codes_for_android_2020.pdfIn PDF document text
    • https://nedetuvozuwe.weebly.com/uploads/1/3/4/6/134699612/xezetusidomuj_zolikosutidino_pilukedepiduju.pdfIn PDF document text
    • https://fuzujaloxoz.weebly.com/uploads/1/3/4/6/134684853/pimena.pdfIn PDF document text
    • https://site-1176586.mozfiles.com/files/1176586/autocad_2010_64_bit_adlmint__dll_crack.pdfIn PDF document text
    • https://site-1210646.mozfiles.com/files/1210646/faroxokovun.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375889/normal_5fc57718dbc09.pdfIn PDF document text
    • http://sumemejosanavo.iblogger.org/guided_meditation_for_anxiety_and_deep_sleep.pdfIn PDF document text
    • https://pevugubak.weebly.com/uploads/1/3/2/7/132740457/wopagafiruzipi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://moxododokojuke.epizy.com/uniform_motion_science_definition.pdfIn PDF document text
    • http://bidexegope.epizy.com/mazezugepaxuwukolosur.pdfIn PDF document text
    • http://kebafitesulodu.epizy.com/kenyan_passport_application_form_online_in_kenya.pdfIn PDF document text
    • http://tidegofavinugaw.epizy.com/88593919723.pdfIn PDF document text
    • http://magivaxinel.rf.gd/atmega328p_full_datasheet.pdfIn PDF document text
    • http://ginokaze.epizy.com/66974813315.pdfIn PDF document text
    • http://pebulibupa.rf.gd/33422480689.pdfIn PDF document text
    • http://kanusilos.epizy.com/93942417273.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_off0000ef99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF99 4724 bytes
SHA-256: 58d916b91a5b7ba583b3c25c729a6e2d146c2d540d2626afcdf2f258ab60e6b9
font_01_sfnt_off0000ff93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF93 10540 bytes
SHA-256: a3be112472c0f28d6470e6c50701c48ed7960a2e78446420ce1327237de0c463

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