Malicious PDF — malware analysis report

Static analysis result for SHA-256 31ef8b700cc74347…

MALICIOUS

PDF

135.1 KB Created: 2021-04-08 02:49:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 35a2932b39a4a5e149c313202c7ee678 SHA-1: 581b5f5fa1a042ed26368989e11f08d344cc4afd SHA-256: 31ef8b700cc7434792ab63a53170003eae21b8f91e281116e4d03e5f2b814541
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 0.9972

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://jumiwimov.ru/wix?keyword=natural+and+inverted+sentences+worksheets+pdf PDF link annotation
    • http://show-visitor.xyz/67993337616qryob.pdfIn PDF document text
    • http://my-favshopf.online/bose_wave_radio_cheapest_price3f2sw.pdfIn PDF document text
    • http://nncucuucuc.space/farmers_almanac_planting_guide_for_may1yd2d.pdfIn PDF document text
    • https://zepazilarewar.weebly.com/uploads/1/3/4/3/134310653/golaferifedus.pdfIn PDF document text
    • http://extraterrestrials.space/abide_verb_forms_in_englishjbryq.pdfIn PDF document text
    • http://bemelegevew.22web.org/rixenamibuxowu.pdfIn PDF document text
    • http://dixixamada.iblogger.org/vedagolatakajilekij.pdfIn PDF document text
    • http://kwini-fini.online/california_lightworks_solarxtreme_1000_tmg5ad6.pdfIn PDF document text
    • http://akillidestekbasvuruformu.online/haryana_election_result_2019l3nai.pdfIn PDF document text
    • https://novomuzedideb.weebly.com/uploads/1/3/1/4/131406537/detaxeluledev_jadagudexutodut.pdfIn PDF document text
    • http://mugatazujiririv.iblogger.org/rufarilevejudexazonedojip.pdfIn PDF document text
    • http://podorokufexapal.iblogger.org/82464359077.pdfIn PDF document text
    • https://waguxezemi.weebly.com/uploads/1/3/4/7/134703223/lejoduza_raponaj_viduwovelami.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://kebowikosu.epizy.com/how_to_build_a_top_bar_bee_hive_free_plans_on_website.pdfIn PDF document text
    • http://wevikokuzufos.epizy.com/32059942550.pdfIn PDF document text
    • http://genafivibin.rf.gd/automation_anywhere_community_edition_free.pdfIn PDF document text
    • http://jowesokawebape.epizy.com/toguxujulanatofe.pdfIn PDF document text
    • http://xuwizigev.rf.gd/zojev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4531e562-28b3-4c73-82bb-396a494f229c/journey_to_the_west_fish_demon_full_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83bc75c9-ebc5-4119-bc36-5cfa834bb472/subtracting_integers_word_problems_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e79deaf-4c09-4153-b3a5-95106f0eaa79/the_conversion_code_chris_smith_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4647873-6018-41f4-aea6-70f919f75645/rutidejumi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b93a1e1-3ac4-42fe-9ca5-93fc13b77265/how_to_do_live_stream_on_google_classroom.pdfIn PDF document text
    • http://kenupavif.epizy.com/171116780.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001c358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C358 5308 bytes
SHA-256: 68d4fae78ef17f9802797c828700e98ec4f40ee746c1315a86210b9b1d0c3039
font_01_sfnt_off0001d571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D571 12712 bytes
SHA-256: daa4a7fff551ff0b2cd1209a3ccd4467897ea4b53123ce4cfa80254779993abc
font_02_sfnt_off0001ffd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FFD9 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34