Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ac8f49336a94340…

MALICIOUS

PDF

81.0 KB Created: 2021-03-12 21:29:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 43bdbe1373b04e3163d69cfe25aa8433 SHA-1: 55ad2a0a4b79d09e7d4068523cd218f7007b48e3 SHA-256: 2ac8f49336a94340a1864886245de36fcd2e97de43848a89264e3fe41b0cdbb7
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO poisoning tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs and the document's structure point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 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.
  • 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://seumenha.ru/award?keyword=rachmaninoff+piano+concerto+3+piano+solo+pdf PDF link annotation
    • http://ctuxuu.com/excel_2013_download_windows_10bdt1c.pdfIn PDF document text
    • http://kinokaiff.space/cheat_sheet_sqlalchemy82yua.pdfIn PDF document text
    • http://passive-income.ru/whirlpool_duet_sport_dryer_belthpzp7.pdfIn PDF document text
    • http://malespw.xyz/wibumegufatzfc.pdfIn PDF document text
    • https://mojogobiwed.weebly.com/uploads/1/3/4/7/134747953/fevote-fesotezari-bexaxogifer.pdfIn PDF document text
    • http://idealicait.website/optimist_or_pessimist_testwq8mb.pdfIn PDF document text
    • https://rogapunuki.weebly.com/uploads/1/3/4/3/134375427/jirekodoli.pdfIn PDF document text
    • https://kagivosivozavex.weebly.com/uploads/1/3/4/7/134746508/067e689f3ffd3.pdfIn PDF document text
    • http://mstmail.space/37031834195e28ie.pdfIn PDF document text
    • http://securespot.ru/rimor408cz.pdfIn PDF document text
    • https://gijifapezikad.weebly.com/uploads/1/3/4/6/134644128/nazogozoj.pdfIn PDF document text
    • http://begdas.space/wukoropukenibijajil7ts.pdfIn PDF document text
    • http://kafikiwamavo.22web.org/amazing_spider_man_apk_data_free.pdfIn PDF document text
    • http://getveran.site/life_fitness_x9i_elliptical_trainerxg3bj.pdfIn PDF document text
    • https://tupodoki.weebly.com/uploads/1/3/0/7/130776149/ade84b96.pdfIn PDF document text
    • http://securityverifiedservices.com/kenmore_gas_dryer_not_heating_all_the_timehysbl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1eba3b37-3dce-45e8-aa15-e51a58efc0fe.filesusr.com/ugd/89e37c_fe9678195936465fa5518c95ae621e90.pdf?index=trueIn PDF document text
    • https://28546a20-d0cc-4b82-bb4f-6711990cd5a3.filesusr.com/ugd/0bcf16_d3d18934afa6478eb938a4ba0a2ec2e0.pdf?index=trueIn PDF document text
    • https://bd15da75-ee01-4ad3-8b22-4778d9929f37.filesusr.com/ugd/1abc29_70de2a33cf83475e83887eaa98b8e543.pdf?index=trueIn PDF document text
    • https://b3709dad-42f4-4621-9b7e-74d31ca978cd.filesusr.com/ugd/f91cf1_3e79c007c9954d47ba3fd5cb5912e87e.pdf?index=trueIn PDF document text
    • http://sikirubuguje.epizy.com/53299549972.pdfIn PDF document text
    • https://24a70dd4-b549-4b9e-9c0a-6eea45ab85ad.filesusr.com/ugd/ab0c63_fbb321c89e1e41d4966a465922e412bc.pdf?index=trueIn 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_off0000e9c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C0 5564 bytes
SHA-256: 7c2bac128d0fe593231cff6c5ac95543ec28317319fe95c9aab39ebc2aebdc5b
font_01_sfnt_off0000fc83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC83 10492 bytes
SHA-256: d58db192347bfa17e21fdf14e3b8018862045b3ce8eefc1e1f59083e95d6a54e
font_02_sfnt_off000120aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120AA 16120 bytes
SHA-256: 73e2bae015806fcbcea00a5e77fef36cf57312733aebee32ba98308b5ce41d75