Malicious PDF — malware analysis report

Static analysis result for SHA-256 57a804240a8d4fcd…

MALICIOUS

PDF

76.0 KB Created: 2021-03-29 01:08:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6f0ef3a9dbf87b8664577c76d845c192 SHA-1: c7683012a94d814f3f00b88c86e050790d3ba146 SHA-256: 57a804240a8d4fcd7aaf3024f88db3ca59c2ca6dedbd54058764d6921ff46cf8
166 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. It uses a password-protected-archive lure. 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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://baarspo.ru/123?utm_term=resident+evil+4+trainer++for+pc PDF link annotation
    • http://lalikexitaxixix.getenjoyment.net/legevub.pdfIn PDF document text
    • http://wulutano.mywebcommunity.org/fofexulogivatewa.pdfIn PDF document text
    • https://cdn.sqhk.co/gigijuke/BghyjgN/wingstop_menu_prices_el_paso_tx.pdfIn PDF document text
    • https://cdn.sqhk.co/japokaxe/Fifijia/amazon_goes_gold_espana.pdfIn PDF document text
    • http://jebebixazonutug.mypressonline.com/77526214955.pdfIn PDF document text
    • http://suwufexez.sportsontheweb.net/oxalate_containing_foods.pdfIn PDF document text
    • http://worameruvejaka.mywebcommunity.org/99718099397.pdfIn PDF document text
    • http://xaredazisom.mywebcommunity.org/rabofar.pdfIn PDF document text
    • http://leporabev.mywebcommunity.org/82015539619.pdfIn PDF document text
    • https://jukekusam.weebly.com/uploads/1/3/4/6/134651272/1235908.pdfIn PDF document text
    • https://jobalexaxikut.weebly.com/uploads/1/3/4/8/134892204/520810.pdfIn PDF document text
    • http://fudoviwil.mywebcommunity.org/ruveru.pdfIn PDF document text
    • http://jijuduli.mywebcommunity.org/voguritosizogetoxalivogid.pdfIn PDF document text
    • http://tarekupi.scienceontheweb.net/saswara_veda_mantras_telugu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xemigososefof.atwebpages.com/can_ps3_wireless_controllers_work_on_ps4.pdfIn PDF document text
    • http://xogijowag.onlinewebshop.net/sony_bravia_tv_wont_turn_on_red_light_flashing_2_times.pdfIn PDF document text
    • https://cae2aa39-5014-47ec-b549-0fed73f36d02.filesusr.com/ugd/c8683e_231e624f483d4185b2032325e7b68bbd.pdf?index=trueIn PDF document text
    • http://bifovigavij.myartsonline.com/cmfas_m9.pdfIn PDF document text
    • https://64f1e6a9-4530-4009-9f9b-67b91dd69f79.filesusr.com/ugd/76b6de_0686921cde384ca892b9fff067cd9d62.pdf?index=trueIn 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_off0000e995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE995 5304 bytes
SHA-256: a4a5917782ff05edebe8fefae3059cd2a49e20818aad5a6325456322beb1e4dc
font_01_sfnt_off0000fbc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC2 11636 bytes
SHA-256: 5d78f5c082e6b3ed455c29b892de49c38d4c85df372f6affc35e43cbf4ee97df

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