Malicious PDF — malware analysis report

Static analysis result for SHA-256 759d65edc1b2566e…

MALICIOUS

PDF

77.4 KB Created: 2021-05-25 08:01:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1bc123957fc2d15c0d4981fb3be48abc SHA-1: 12d53b0aacb9e9b721ffadc1633dba76b5fcfa7c SHA-256: 759d65edc1b2566e0c8284acad19501f1d8a833a883ad7ab27c783597f955a65
186 Risk Score

Malware Insights

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

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 0.9996

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://crophysi.ru/strik?utm_term=solidworks+200+exercises+pdf PDF link annotation
    • https://punafatig.weebly.com/uploads/1/3/1/4/131408139/fafisusaw.pdfIn PDF document text
    • https://kuvovoturuja.weebly.com/uploads/1/3/5/3/135322548/ae301f4.pdfIn PDF document text
    • https://pinuwolaterogus.weebly.com/uploads/1/3/5/9/135957395/3398798.pdfIn PDF document text
    • https://pixebekisutajud.weebly.com/uploads/1/3/0/7/130775176/7106773.pdfIn PDF document text
    • https://tetemubegogik.weebly.com/uploads/1/3/4/4/134443084/jivotovemewag-mexemivumaped-ligisowe.pdfIn PDF document text
    • https://pisaloxonuk.weebly.com/uploads/1/3/4/3/134391291/82d2e396f99d4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mamibis/66147853872.pdfIn PDF document text
    • https://s3.amazonaws.com/gumagabu/61440658292.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/965391df-908f-48cc-82ad-b01171a23004/how_do_i_get_paid_with_monat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc50652a-2b5d-455b-a677-7fddde235289/korerola.pdfIn PDF document text
    • https://s3.amazonaws.com/tosevud/zemuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/023b8f31-b593-47a2-830d-dd501c56c73c/honda_rancher_350_2wd_lift_kit.pdfIn PDF document text
    • https://s3.amazonaws.com/dukajevo/altova_xmlspy_2018_professional.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba8b6811-c3c1-48b1-aeb9-2ea02926279b/who_controls_donetsk_airport_today.pdfIn PDF document text
    • https://s3.amazonaws.com/tujeviwakirawu/divergent_3_allegiant_2016_full_movie_in_hindi_download_khatrimaza.pdfIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/ataxic_gait_video.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bde292e-02c0-4b2b-a95c-d005142dad25/what_brand_of_air_fryer_is_the_best.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af4baef3-ab56-4dbd-9568-359382c070a4/what_is_comfort_in_the_bible.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90e9dea3-d43d-4762-bd4f-cae41e562204/what_child_is_this_piano_guys.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2261955-630e-48d5-b450-8e8cc0b20943/can_i_play_simcity_on_mac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6eba027-c9b4-423a-802f-129a81ad770b/70170747763.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23b93a33-3216-49c2-8ad2-ce3aaa4c46b2/muwudafiripulexumos.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_off0000ed80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED80 5540 bytes
SHA-256: d7b6bcdf5d398c3aa6f48edf087c79d2776386b4b923823ee719748dee7a67d4
font_01_sfnt_off00010092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10092 11444 bytes
SHA-256: 539dc427b9ca95b1725a1c3429c85d3c302ee8136eaebef46e549c653c684d2f