Malicious PDF — malware analysis report

Static analysis result for SHA-256 acd28aba899d8536…

MALICIOUS

PDF

122.4 KB Created: 2021-03-07 20:39:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: e4213bdcaa60b32a57db83dab36ac2df SHA-1: 5456f9b4d6025c113ecde012f28041831157e273 SHA-256: acd28aba899d853668ed66c8050b794d7a5a3d3247b73b97fd4595b860e93f93
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The document body, though heavily obfuscated, contains text related to 'free wordpress themes for bloggers', suggesting a phishing or scam lure. Numerous embedded URLs point to disposable domains, indicating a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/123?utm_term=free+wordpress+themes+for+bloggers PDF link annotation
    • https://cdn.sqhk.co/nanuvoxeva/haiciib/solid_waste_management_book.pdfIn PDF document text
    • https://cdn.sqhk.co/moxoxitij/ifxggpp/wivozosivixudupe.pdfIn PDF document text
    • https://cdn.sqhk.co/lodikorep/lzihia0/wavuxagigaxojavofariporo.pdfIn PDF document text
    • http://tedurelaseji.mygamesonline.org/what_are_the_roles_and_responsibilities_of_a_system_administrator.pdfIn PDF document text
    • http://sufulilutidake.mypressonline.com/82913665440.pdfIn PDF document text
    • https://cdn.sqhk.co/zotipimesaza/hwoifZp/t20_world_cup_2022_venue.pdfIn PDF document text
    • https://cdn.sqhk.co/lupobikud/hFVytmU/9795768126.pdfIn PDF document text
    • https://cdn.sqhk.co/bofagenined/gd1jit6/boo_at_the_zoo_cleveland_discount_tickets.pdfIn PDF document text
    • https://cdn.sqhk.co/vixukose/fgiOohl/hunter_assassin_mod_apk_hack_download.pdfIn PDF document text
    • https://cdn.sqhk.co/panafilaputu/iMjeUgf/retro_brick_phone.pdfIn PDF document text
    • https://cdn.sqhk.co/dosapupa/Shaighg/sculpture_garden_new_york_master_of_none.pdfIn PDF document text
    • https://cdn.sqhk.co/gudijupimeb/KhdibBQ/metaphysical_stores_near_me.pdfIn PDF document text
    • http://gagogepatajebe.medianewsonline.com/kupaxogadud.pdfIn PDF document text
    • http://bawimip.sportsontheweb.net/valusosogerab.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/tiduro/deluperipu.pdfIn PDF document text
    • http://fajazimigig.atwebpages.com/how_to_fix_air_conditioner_leaking_water_outside.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a35994a-80a1-4544-ab5a-20c34c9a4538/61459032049.pdfIn PDF document text
    • http://tikomiwewo.atwebpages.com/56121607617.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5fbf286-a7ef-4ee3-a515-f7fed57ef9d4/what_is_the_best_drugstore_self_tanner.pdfIn PDF document text
    • http://lupixopuvir.onlinewebshop.net/92333866757.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ceb16358-7d49-422e-858c-70400b0d172e/dadebete.pdfIn PDF document text
    • https://s3.amazonaws.com/fipijife/ajax_serialize_form_data_jquery.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f43e1f3-9574-4fad-8047-592f22932b69/how_to_change_kali_linux_user_password.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_off0001a4dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A4DD 5432 bytes
SHA-256: 209348c75d44c50edb6a3d612b1e42c72e958a9c07f9bd5b0eca7e2482b72816
font_01_sfnt_off0001b744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B744 10736 bytes
SHA-256: bca058eecab59041d041cd0ff2359a26fa75afe7b90fded2cc3bf55ab328a51c

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