Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e36cdd6bd93a9b8…

MALICIOUS

PDF

79.5 KB Created: 2021-03-16 04:47:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e5b7196811e317cc85bd1caec8fd2afe SHA-1: c083ee8aec54eda78a1f9969046e293fa389875c SHA-256: 9e36cdd6bd93a9b88cc86274141c4499c2e78be89f27d6901929f95f027de695
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The document body, though heavily obfuscated, contains text related to 'advanced english comprehension test with answers pdf' and mentions 'wkhtmltopdf', indicating a potential lure to disguise malicious intent. The presence of numerous external URIs points towards an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://kuzutuzo.ru/award?keyword=advanced+english+comprehension+test+with+answers+pdf PDF link annotation
    • https://mamifonor.weebly.com/uploads/1/3/1/1/131163935/4462035.pdfIn PDF document text
    • https://lixaworone.weebly.com/uploads/1/3/1/8/131871871/lisujapepapatebin.pdfIn PDF document text
    • https://tokajufifed.weebly.com/uploads/1/3/0/7/130775528/ec32aaae.pdfIn PDF document text
    • https://rejileju.weebly.com/uploads/1/3/4/3/134335231/f11e215ca9c24.pdfIn PDF document text
    • http://tarekupi.scienceontheweb.net/how_to_connect_trimble_tsc3_to_wifi.pdfIn PDF document text
    • http://wupemokabate.scienceontheweb.net/navup.pdfIn PDF document text
    • https://tewutenuka.weebly.com/uploads/1/3/2/6/132695339/nurubeximedi-rigevajulesile.pdfIn PDF document text
    • https://voxiranadazezud.weebly.com/uploads/1/3/5/3/135312978/jirisosine_bimorenemurepab_ramamepejawad_jegijabodaru.pdfIn PDF document text
    • http://kawasus.scienceontheweb.net/95504898491.pdfIn PDF document text
    • http://ruwaxidalemib.iblogger.org/mendelian_genetics_practice_packet_problem_set_answers.pdfIn PDF document text
    • https://zitipijasidigor.weebly.com/uploads/1/3/0/8/130874434/jikubulob-dabidunupidena-jegitu.pdfIn PDF document text
    • https://firunonosud.weebly.com/uploads/1/3/6/0/136052948/kunepopaxu.pdfIn PDF document text
    • http://nazorizuz.medianewsonline.com/contabilidad_de_costos_ejemplos_libro_diario.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://kidaxuv.epizy.com/encapsulated_postscript_to.pdfIn PDF document text
    • http://sokekakeloji.onlinewebshop.net/lexuvobalewudebafeku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d77c255-1714-441f-b751-cbc26f69ab3d/me_before_you_cast_list.pdfIn PDF document text
    • http://sametil.epizy.com/kawetuvoka.pdfIn PDF document text
    • https://fa53e508-d88d-41cb-897c-7a5b6f1bfcc3.filesusr.com/ugd/361045_3e431783358145b7b68a7eed9a56ee79.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/50945732-68f7-405b-aa1c-4f09a2194178/22831638631.pdfIn PDF document text
    • https://98748e4b-3258-471a-903e-8ea98415cca0.filesusr.com/ugd/fd7405_55a53115b17d4bf3b12da90b02afaab4.pdf?index=trueIn PDF document text
    • http://tibobabinenan.epizy.com/rafipunipivofipoke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba1f4606-210f-4094-bac6-8967ee9d335a/85781043134.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ea7d509-e211-4122-8b3c-3885816f4ede/why_did_dracula_choose_lucy.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A8 5496 bytes
SHA-256: 87318f0f8aef01035be4fbe003f34d174970ef00491eeeb0e3293b3e9e4d0feb
font_01_sfnt_off0000fb41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB41 11476 bytes
SHA-256: 2f4db3763bc0880cb650abbeb9e2d1bc3d93c14545b9a6b6cf9f5cf7adfcab29
font_02_sfnt_off00012212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12212 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3