Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fcd23ae396abde3…

MALICIOUS

PDF

76.9 KB Created: 2021-03-21 23:43:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: b1e163c2c755b465f49629afc12166e3 SHA-1: 59c4465b994b57b242fba477aad76497e1083b70 SHA-256: 4fcd23ae396abde3055484c55662377cdb2a8de8fc05de2a75b7b65145402101
164 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

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 0.9993

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.
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • 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=the+first+american+settlements+crossword+puzzle+answers PDF link annotation
    • http://akmurzina.com/down_the_hill_killer_sketch4mec5.pdfIn PDF document text
    • http://tiwimifozukimu.medianewsonline.com/psychrometric_chart_application.pdfIn PDF document text
    • http://nuwevabufa.mypressonline.com/4104202327.pdfIn PDF document text
    • http://digosige.mywebcommunity.org/94538759132.pdfIn PDF document text
    • http://magnifioco.site/fargo_hdp5000_price3huvu.pdfIn PDF document text
    • http://vubitim.sportsontheweb.net/echo_srm_230_carburetor_problems.pdfIn PDF document text
    • http://twoup-viktoria.online/utilitech_6_outlet_stake_timer_instructionsu7w7u.pdfIn PDF document text
    • https://sijetuso.weebly.com/uploads/1/3/4/4/134499475/nepunizakezope_fafiku_rekovasedoboro_sejanin.pdfIn PDF document text
    • https://nituxokijawagez.weebly.com/uploads/1/3/0/9/130969825/patugudinenewibo.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/zibenoroduzuw/black_hearted_song_ringtone.pdfIn PDF document text
    • https://s3.amazonaws.com/jazofi/plataforma_educamos_pureza_de_maria_bilbao.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ab31b3c-e576-4003-b7b5-f44acba54fff/rivivuzu.pdfIn PDF document text
    • https://s3.amazonaws.com/vebogotexaf/elite_dangerous_horizons_combat_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/mikibetiv/8822509061.pdfIn PDF document text
    • https://s3.amazonaws.com/rejiner/facebook_inc_annual_report.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwosil/ludhiana_weather_report_7_days.pdfIn PDF document text
    • http://jemukiguwuw.myartsonline.com/cours_algorithme_pour_dbutant.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aafd94d3-33c4-4e10-97c7-1cb23e013fc5/download_realtek_hd_audio_driver_for_windows_7_32_bit.pdfIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/hp_designjet_500_plus_service_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64aed183-0f37-4a20-8105-424b19144fe8/tomepuxubetoke.pdfIn PDF document text
    • https://s3.amazonaws.com/rakabexozu/messenger_apk_2019_marzo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57f4af46-f2e6-4d5c-9406-6666886120a2/47128216449.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0dbcd1ce-6cfc-4b4b-add2-6f4ad1149989/dunkin_donuts_frozen_coffee_calories_large.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_off0000eee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE3 5488 bytes
SHA-256: b144bada53977e9fd9852b7402335b845a475c0d6ca03a20ee6ada4bee332c6b
font_01_sfnt_off0001017e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017E 10776 bytes
SHA-256: 2eaa7098e7ea7b1f7fb1db6ba8a32feb52853dcd571c314e0ebf4cd584cb156d

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