Malicious PDF — malware analysis report

Static analysis result for SHA-256 19dd05fdaee26f7c…

MALICIOUS

PDF

82.5 KB Created: 2021-03-22 15:58:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3af508aeeae7b5a888f60977846d48da SHA-1: 73c16a29fafc1fe27448f887cfa3a09e4b8e82cc SHA-256: 19dd05fdaee26f7c78b6bfca7627110085fc1ee7416d98d97346995da052e1d0
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting it is part of a link farm designed to drive traffic to other sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a malicious redirection or content-luring scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zajinet.ru/award?keyword=hemiptera+caracteristicas+pdf
    • https://komomofuxuz.weebly.com/uploads/1/3/4/4/134494735/mufamasavijuw_juvofanajex_xonore.pdf
    • https://xujuwoxevosu.weebly.com/uploads/1/3/4/8/134896670/6753567.pdf
    • http://logvoz.ru/endometrial_polyp_removal_guidelines737i5.pdf
    • https://kolofajek.weebly.com/uploads/1/3/0/9/130969684/9c807707a33baa.pdf
    • http://zaralutodunuwa.66ghz.com/kibejebudekejubunazufopes.pdf
    • https://kojovade.weebly.com/uploads/1/3/4/6/134681743/wowubesakewukubop.pdf
    • http://matroskin.space/top_games_2019_apkinkrz.pdf
    • https://miburinu.weebly.com/uploads/1/3/4/4/134464577/magonaxa.pdf
    • http://1pokypki.website/the_bluffer_s_guide_to_etiquette_epubukb8s.pdf
    • http://hookup153.space/numerologia_evolutiva_del_alma9bdaa.pdf
    • http://kaginiluzima.22web.org/how_many_judo_techniques_are_there.pdf
    • https://dadojunolibete.weebly.com/uploads/1/3/2/6/132683289/9803466.pdf
    • https://koponabunabo.weebly.com/uploads/1/3/4/5/134520941/fcf4b6.pdf
    • http://digitalmedialit.com/farsi_language_course49t54.pdf
    • https://tajewarupimef.weebly.com/uploads/1/3/2/6/132681391/6742899.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/4565a8b1-74d5-4c48-8aa1-4fc85a0d40df/fender_passport_mini_7-watt_1x6.5-inch_portable_pa_system.pdf
    • https://uploads.strikinglycdn.com/files/ad640c46-c693-4cc2-b4a0-cfc2ec11e414/89770309158.pdf
    • http://paxugevobudutis.epizy.com/2._3_distinguishing_elements_and_compounds_answers.pdf
    • https://uploads.strikinglycdn.com/files/890ee828-dbed-4a03-93d3-3f4e3ff6a090/miditipinejujesiwovofob.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104e2.bin
a557748bdd499c2a9508e3e42ae626106ad2174b16aaed5ba8deac792e7a499d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104E2 5232 bytes
font_01_sfnt_off00011691.bin
8b01fb399aa2cf305925c37ddbc2749db6a2cc1fddb2fa5f3b76402082069eb7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11691 11352 bytes

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