Malicious PDF — malware analysis report

Static analysis result for SHA-256 681b39d6eeae5899…

MALICIOUS

PDF

78.7 KB Created: 2021-03-24 01:48:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8b12739a936cf2521e113b31894b2ee9 SHA-1: 14ca137f5593b13bca1a145ea198b8769f8bc5dc SHA-256: 681b39d6eeae5899311dfa18120c298df5662c18ccf7519e91edf462d9149019
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 0.9997

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://gimoguvi.ru/strik?utm_term=verbos+en+ingles+en+todos+los+tiempos+con+significado+y+pronunciacion+pdf PDF link annotation
    • https://cdn.sqhk.co/zelumevimitu/hgGD0ji/79036645286.pdfIn PDF document text
    • https://cdn.sqhk.co/zerurukoraju/CTbA6gf/hair_coloring_recolor_photo_hair_colors.pdfIn PDF document text
    • http://rixanemusijod.mywebcommunity.org/fonenejo.pdfIn PDF document text
    • https://cdn.sqhk.co/fupipevu/ExhjQjd/lorexirumewebetux.pdfIn PDF document text
    • http://kifopelidito.mypressonline.com/best_startups_of_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/ninivaxibab/ygighie/distributive_property_with_variables_worksheet_with_answers.pdfIn PDF document text
    • http://wukuname.mypressonline.com/sql_stored_procedure_tutorial_point.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/4990027a-abca-4526-a056-f9a6f76a63d2/garmin_vivosmart_4_activity_tracker_small_black_slate.pdfIn PDF document text
    • https://s3.amazonaws.com/xezonijida/wuvuzanekidilozizi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/258e3690-91da-42be-9332-4a8f6a9238ce/how_to_improve_dog_joints.pdfIn PDF document text
    • http://doriponesarom.myartsonline.com/32938423635.pdfIn PDF document text
    • https://s3.amazonaws.com/zexozavo/scenario_plural_form_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a27d548-dbdb-4147-8327-39e69b5ba0c8/powermatic_2_electric_cigarette_injector_machine_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67fe4798-c1e6-4de1-aa95-c1cc20d4dc92/ihome_ibt230_price.pdfIn PDF document text
    • https://s3.amazonaws.com/jozetej/rajasthan_girdawari_report.pdfIn PDF document text
    • https://s3.amazonaws.com/bokofapig/garmin_astro_320_spare_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/gosete/singing_exercises_for_dummies_books.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f754c564-6c8f-406b-ac0f-4c21918bfa1d/riwewalaginakamoka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb50807f-f7d2-4803-b101-244dd4f27d83/how_to_always_win_a_fist_fight.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81311edc-80d5-44e6-a7c3-b97eb53f0f9e/craftsman_8_gallon_wet_dry_vac_accessories.pdfIn PDF document text
    • http://mewabetowa.myartsonline.com/structure_and_function_of_antibodies.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_off0000f4fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FB 5684 bytes
SHA-256: 97137869794b69c7fd24b987eae9a3acfe44b2f080f3e8b8b0e5eff2797e71ef
font_01_sfnt_off00010841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10841 11652 bytes
SHA-256: 2d8f6c69f6a59c71b6b01073b4c701f3bbe9fc1df9bf51e2696b0d0831d3964e