Malicious PDF — malware analysis report

Static analysis result for SHA-256 775d37a49d7de88f…

MALICIOUS

PDF

91.0 KB Created: 2021-04-22 20:59:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: d5b0a6bd4227ba40f437d4bb0f5e3047 SHA-1: 909e79a3287535017795eb2945bff872f24cb5dc SHA-256: 775d37a49d7de88f77cbe641fc379edab6a2e4247a61805627ea70573c5d0385
186 Risk Score

Malware Insights

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

The PDF document contains numerous external links, identified as a link farm, with a primary URL pointing to a search result page. Heuristics indicate a high likelihood of phishing and malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • 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 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://leonvi.ru/strik?utm_term=children%2527s+bedtime+stories+free+to+read PDF link annotation
    • https://mabaxezo.weebly.com/uploads/1/3/4/7/134766945/9532173.pdfIn PDF document text
    • http://zejenaxudemato.22web.org/lipepodotamapopiz.pdfIn PDF document text
    • http://toredakaf.22web.org/definisi_pendidikan_agama_islam.pdfIn PDF document text
    • http://selozufuwadapuw.66ghz.com/zeraxib.pdfIn PDF document text
    • https://fubudebuz.weebly.com/uploads/1/3/2/7/132712336/732232.pdfIn PDF document text
    • https://nelubetif.weebly.com/uploads/1/3/5/3/135322580/bizoparovusa-malefarakogimam-xewonumi.pdfIn PDF document text
    • http://pidawudimo.scienceontheweb.net/jekuf.pdfIn PDF document text
    • http://kebuwakuje.medianewsonline.com/axis_mutual_fund_common_application_form_with_sip.pdfIn PDF document text
    • http://nebolizixake.iblogger.org/pasado_simple_verbos_regulares_en_ingles_ejemplos.pdfIn PDF document text
    • http://kobopez.mygamesonline.org/surah_al_mulk_full_download.pdfIn PDF document text
    • https://fepepifufom.weebly.com/uploads/1/3/1/8/131872298/6099838.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://144ece88-722e-4d59-a9d1-ae16887514c2.filesusr.com/ugd/48b17f_5fe2742e32454e02b34fe390a57547a0.pdf?index=trueIn PDF document text
    • https://f5f74d4f-f804-4d9b-9bfa-9964b2756261.filesusr.com/ugd/e389b3_31ab383a5b25460cb781eaf6e435cd4e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4110822-4757-43fa-9a92-4c4f972cd427/que_es_estilo_de_vida_saludable_segun_la_oms.pdfIn PDF document text
    • https://a04ad255-06d6-4b17-97e7-91173d300295.filesusr.com/ugd/6864df_99252b1530854bc1badc02a837b7c44f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/75b6e377-75fd-4845-9bb2-7f777f61c20c/how_much_does_an_ipod_mini_cost.pdfIn PDF document text
    • http://femadonalu.epizy.com/71398987141.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/898c5ac0-7221-4505-9914-9a20deb6c284/how_to_install_a_new_cartridge_in_a_delta_shower_faucet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d953eaa-d69e-4574-bee5-65a8e9f96397/28340777458.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4a085ac-8735-430a-b886-2cc1c5b87811/resolution_of_a_streetcar_named_desire.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f06a7723-6b25-469a-9508-2fbb01f77b03/under_the_dome_season_2_episode_4_watch_online.pdfIn PDF document text
    • https://041f977c-1598-48cb-b578-3d63f550c8ab.filesusr.com/ugd/524ae3_bfb8887ac62c4fa599ff8c79cd5c5f53.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ced2e79e-44d6-44e4-881c-8e7746bb106f/82300650280.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fd80acb-918f-4b4a-a790-d1b1193e10f7/turifimewu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39d2987b-1a92-4048-a2c6-0a7bd1398e32/rakewopetaboxusezibotif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/faf10cc7-9665-40f6-820c-066df7bfd187/what_are_interesting_boy_names.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_off000125b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B2 5224 bytes
SHA-256: 1ae05069e356867cbdfa2d535b1997554ef72e55e181341fc95a1a8ba0b3fe52
font_01_sfnt_off00013747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13747 10892 bytes
SHA-256: ff298c2afa796bc7e18174076f29b15e895e9be2f694992a6fa29560e23146a1