Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3dfa076b2703dad…

MALICIOUS

PDF

76.1 KB Created: 2021-03-08 12:32:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 73798efdbdff3734dd672ac70460b2cf SHA-1: e0addcc0ef71b32ceec16f073777bae754df07d8 SHA-256: a3dfa076b2703dad754365badd89506ac2e1549835b8c279ffcc2c20bfece5c4
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9952

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://maypoin.ru/wix?keyword=atascadero+school+district PDF link annotation
    • https://cdn.sqhk.co/mukibusu/bcjdgeO/filatipudukibizuta.pdfIn PDF document text
    • http://all-system7.work/xifurifutow4tukv.pdfIn PDF document text
    • http://proba7.xyz/piano_play_magic_tiles_games_appleqf3a6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385228/normal_5ff223aba2b81.pdfIn PDF document text
    • http://dektesheff.xyz/bigajoloxofirisavomozeza6r1a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375350/normal_602d0b793b5f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496374/normal_602d51c3eacb0.pdfIn PDF document text
    • http://bunnygummy.ru/9267907685vuk8h.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418000/normal_6028b088109c3.pdfIn PDF document text
    • https://cdn.sqhk.co/dajebala/WOau6sx/98013914884.pdfIn PDF document text
    • http://reduslim-buy.site/riralezeram9g3.pdfIn PDF document text
    • http://dektesheff.xyz/fireboy_and_watergirl_ice_temple_cool_math_games8dbc4.pdfIn PDF document text
    • https://cdn.sqhk.co/vifutetax/0X4wKqq/rome_total_war_barbarian_invasion_mods.pdfIn PDF document text
    • http://uuuuull.space/72082424009v8uy4.pdfIn PDF document text
    • https://cdn.sqhk.co/pemejurove/ijazjjm/sd_tank_war.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414860/normal_5fc89d946b8a1.pdfIn PDF document text
    • http://jushq.club/what_is_a_positive_linear_association99ngb.pdfIn PDF document text
    • https://cdn.sqhk.co/tijinujul/LhfJigy/motorcycle_shop_nyc.pdfIn PDF document text
    • http://digitaltoolsfor.xyz/chemistry_1_ionic_bonding_practice_problems_worksheet_answersggz26.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/jivamubug/62473156301.pdfIn PDF document text
    • https://s3.amazonaws.com/vidadaviwal/bootstrap_modal_form_submit_php_mysql.pdfIn PDF document text
    • https://s3.amazonaws.com/tixeligufokup/voteragajefebazuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0e4644b-d2fb-4674-a11f-faf987930551/35755520381.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbf799ab-f6e6-4a22-a350-49f4ac621854/4381401303.pdfIn PDF document text
    • https://s3.amazonaws.com/luborinizu/firefox_quantum_esr_60.pdfIn PDF document text
    • https://s3.amazonaws.com/zafirawit/nemel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f17be442-c47e-4678-959d-ed6b07e9ca37/best_carpet_cleaner_solution_for_old_pet_urine.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_off0000eaff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFF 5016 bytes
SHA-256: 1cb8db133a9b2c9326ff8646b1177588fdde446863f112584e07017d6ef3263f
font_01_sfnt_off0000fc03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC03 10856 bytes
SHA-256: a6a14f18aade46b1b72e9dd8f16999c8a1b715bef6bdeb392a98bf401388aead

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