Malicious PDF — malware analysis report

Static analysis result for SHA-256 243d9944ca2e8b29…

MALICIOUS

PDF

79.6 KB Created: 2021-04-05 04:18:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: ddd141c933b8095410c37308812c6d99 SHA-1: c9dc04067cfb767ff94c35a1c57acd5bd827c62d SHA-256: 243d9944ca2e8b2921114882bf7f42bd61a4b0ae9b3292e4602401e9f6d1547d
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://xajibur.ru/123?utm_term=arthrographie+de+l%2527+%25C3%25A9paule+pdf PDF link annotation
    • http://lifeeuro.info/blank_piece_of_paperqgpip.pdfIn PDF document text
    • https://negofugino.weebly.com/uploads/1/3/4/5/134529575/vulano_bomudukomulesut_visawuzozesefa.pdfIn PDF document text
    • http://xebubux.sportsontheweb.net/25574389884.pdfIn PDF document text
    • http://pimifawimonidij.mywebcommunity.org/bijezizidilifexadaba.pdfIn PDF document text
    • https://fofapabijutoza.weebly.com/uploads/1/3/4/7/134713913/6301227.pdfIn PDF document text
    • http://vadosixajobirug.mygamesonline.org/tawugo.pdfIn PDF document text
    • http://maximizator.xyz/57763425739m4k2x.pdfIn PDF document text
    • http://xusetifawog.mypressonline.com/bender_gestalt_test_manual.pdfIn PDF document text
    • https://nibafokabatawal.weebly.com/uploads/1/3/0/9/130970001/2f5b5f.pdfIn PDF document text
    • http://grizhoff.ru/widor5kq52.pdfIn PDF document text
    • http://startbastar.online/9008858458179yz.pdfIn PDF document text
    • http://jabudapitu.scienceontheweb.net/mugipejokenalumepadafemo.pdfIn PDF document text
    • http://fatabigufoli.iblogger.org/vuragesanodilabeko.pdfIn PDF document text
    • http://i-men.ru/how_big_is_25_x_30_cm_in_inchesnvt25.pdfIn PDF document text
    • http://rozefuzapotor.iblogger.org/bts_answer_love_myself_lyrics_ccl.pdfIn PDF document text
    • https://filewefoxu.weebly.com/uploads/1/3/4/7/134750201/2186777.pdfIn PDF document text
    • https://viwezoluzuwa.weebly.com/uploads/1/3/4/4/134401695/6bb141.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://janevowox.epizy.com/wolirorudavejesukutam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae8a5ffa-011e-4805-b97e-4bc8f076477f/2955473379.pdfIn PDF document text
    • https://s3.amazonaws.com/wifiduxezo/vefaperebewisit.pdfIn PDF document text
    • https://s3.amazonaws.com/wobuzisibal/78773626535.pdfIn PDF document text
    • http://lolamidubafa.rf.gd/80143348406.pdfIn PDF document text
    • https://s3.amazonaws.com/padosumifubobo/45310183617.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bea7457-7493-4718-b092-32dcd06f54b8/34370176879.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a0d7de5-618f-4964-8524-f8cd6714ecd8/94822778293.pdfIn PDF document text
    • https://s3.amazonaws.com/mosezavor/whats_calorie_surplus_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb886337-4c55-4c72-844c-3fcb6b53bf4d/new_holland_455_sickle_bar_mower_parts_diagram.pdfIn PDF document text
    • https://s3.amazonaws.com/memobofilenabon/java_file_to_specific_folder.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2df506b-8ef1-474c-b78e-d5918c07b1fc/ps_vita_games_coming_soon.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_off0000f4dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DC 5292 bytes
SHA-256: cbed286e620f3a6955f87018cdb4aea57a776ae18a65f32711d3034ceee7c3d0
font_01_sfnt_off0001069f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069F 12436 bytes
SHA-256: 9075a28907d57b7f2a1b6ac9e3461e0bb395104b6882767c1c2b306c3f47a567