Malicious PDF — malware analysis report

Static analysis result for SHA-256 6aa74445b8bf57bc…

MALICIOUS

PDF

79.4 KB Created: 2021-05-13 10:53:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 98cca2fa35b5da379fc78dde48958084 SHA-1: d9b1447f65d4a1e2ce5d6a982a597ec75e74565d SHA-256: 6aa74445b8bf57bca5afac253c70cfb993f4f2db6ad5f29d35d25519e6394d53
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://golowaki.ru/strik?utm_term=the+three+questions+by+leo+tolstoy+setting PDF link annotation
    • https://jimedugevebuz.weebly.com/uploads/1/3/4/4/134437071/6645148.pdfIn PDF document text
    • https://gekuxufetog.weebly.com/uploads/1/3/1/3/131384115/2086890.pdfIn PDF document text
    • http://tuzirawejaw.mypressonline.com/early_childhood_special_education.pdfIn PDF document text
    • https://duduzigofusu.weebly.com/uploads/1/3/2/8/132815892/78952.pdfIn PDF document text
    • https://zijubanefim.weebly.com/uploads/1/3/4/3/134349059/mowubakuros.pdfIn PDF document text
    • http://wivikaxebox.medianewsonline.com/surah_yasin_full_bangla.pdfIn PDF document text
    • https://mabelemaje.weebly.com/uploads/1/3/4/7/134705401/ba2cb0da510f.pdfIn PDF document text
    • http://damapilob.iblogger.org/73648170941.pdfIn PDF document text
    • https://bowonalixatan.weebly.com/uploads/1/3/5/3/135347428/vimibasanotal.pdfIn PDF document text
    • http://fazejajogavu.medianewsonline.com/webabigivupebebatiwabutab.pdfIn PDF document text
    • http://tezuveripoxub.mypressonline.com/araby_literary_analysis.pdfIn PDF document text
    • https://salufisudad.weebly.com/uploads/1/3/2/6/132695294/velosatufup_wuwabe_nuvevotudilaw_vukone.pdfIn PDF document text
    • https://nuzojumikosa.weebly.com/uploads/1/3/0/8/130814298/pariguzafebe.pdfIn PDF document text
    • https://vadutebo.weebly.com/uploads/1/3/4/8/134889136/45142ca75d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/116cf317-6f13-4ff0-afaa-58797d40f58a/sijagawaf.pdfIn PDF document text
    • http://pigadanafoton.rf.gd/40090728345.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99df26f9-571f-40b1-8d0f-342ad924aab2/noxerexosojidepif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07b5ff94-ea9c-47e8-8053-24fb84f5f43f/how_much_does_a_40_gallon_gas_hot_water_heater_cost.pdfIn PDF document text
    • http://masemipeba.myartsonline.com/lejokugipukajilabisagaguv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f888d7e-feea-4551-a705-f2dd9d459850/7747632954.pdfIn PDF document text
    • http://nokejufesuw.atwebpages.com/clipsal_saturn_switches.pdfIn PDF document text
    • http://jigisasamupor.onlinewebshop.net/auxin_and_its_role_in_plant_development.pdfIn PDF document text
    • http://gugamofizuxeg.epizy.com/99_names_allah_printable_sheet.pdfIn PDF document text
    • http://vitivewizonomaw.epizy.com/german_beginner_exercises.pdfIn PDF document text
    • http://difesasud.epizy.com/alfonsina_y_el_mar_partitura_voz_y_piano.pdfIn PDF document text
    • http://wepunulirepobi.myartsonline.com/bohemian_rhapsody_piano_sheet.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_off0000f85e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85E 5056 bytes
SHA-256: 2198725fea1971e86b4075bf071af18fd7a4f52fd4bc5aa2c05ee5e9898047d7
font_01_sfnt_off00010995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10995 10568 bytes
SHA-256: 6c8442c1008a1b63e1909f78fcef194669b07095e7b51d91099ca702c0fcb7d4