Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f7921ccb816a2ab…

MALICIOUS

PDF

77.0 KB Created: 2021-03-15 12:14:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3bdd4d9a11fea9fcbf06dce8f704e307 SHA-1: b6363d54bc656c28c3e7a36b89515f21fc5879b8 SHA-256: 2f7921ccb816a2ab02fd355c332783eb8409329aebc139af3cafeb357b46d089
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 0.9998

Heuristics 6

  • 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 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://leonvi.ru/123?utm_term=amoeba+primary+form+of+locomotion PDF link annotation
    • https://cdn.sqhk.co/vitimosugu/dxMhLih/kitewixobazuzatesasafit.pdfIn PDF document text
    • https://navubenawegef.weebly.com/uploads/1/3/4/3/134320789/4341494.pdfIn PDF document text
    • http://tafasizogir.22web.org/vojasaligabozezibam.pdfIn PDF document text
    • http://povulofi.mywebcommunity.org/toyota_highlander_2012_maintenance_schedule.pdfIn PDF document text
    • https://cdn.sqhk.co/nitagalut/ififijT/street_fighter_4_apk_full_download.pdfIn PDF document text
    • http://dusanaputojinon.mygamesonline.org/dizumubimegepizara.pdfIn PDF document text
    • https://cdn.sqhk.co/juzilolawu/hfifidJ/spotify_radio_station_error.pdfIn PDF document text
    • http://nifazafagikoxa.medianewsonline.com/80544648966.pdfIn PDF document text
    • http://zefedupawomodos.22web.org/41128477146.pdfIn PDF document text
    • https://cdn.sqhk.co/banuluwopote/gidfnje/jogelevegusi.pdfIn PDF document text
    • https://cdn.sqhk.co/pojuzijix/ihpFmih/fekoluwukamojo.pdfIn PDF document text
    • http://bisapusid.mypressonline.com/62937685077.pdfIn PDF document text
    • https://jaxevilin.weebly.com/uploads/1/3/1/6/131606955/073055e1.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/sitozi/mammogram_guidelines_over_70.pdfIn PDF document text
    • http://wekidezeze.epizy.com/chupke_se_koi_aayega_status.pdfIn PDF document text
    • http://mufuniwikolokil.epizy.com/types_of_computer_hardware_and_software.pdfIn PDF document text
    • http://fegixifew.epizy.com/jikevenaxuke.pdfIn PDF document text
    • https://s3.amazonaws.com/purawuma/que_finalidad_tiene_un_titulo_de_credito_hipotecario_negociable.pdfIn PDF document text
    • https://s3.amazonaws.com/tometubufimopim/glencoe_health_chapter_24_answers.pdfIn PDF document text
    • http://mafofeguf.epizy.com/padepit.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_off0000eee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE7 5212 bytes
SHA-256: 04e8cfdcf507191ba870ae7f3e2a839db8215924db05ff74e10cc82f22ec3c71
font_01_sfnt_off0001009b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1009B 11108 bytes
SHA-256: 379a7258d6fd95ea8db0da2da4edf1103fd100f2b6f00cf7305fbf717fb30205

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