Malicious PDF — malware analysis report

Static analysis result for SHA-256 862373747c815c2b…

MALICIOUS

PDF

75.9 KB Created: 2021-04-19 21:42:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b093f5939421e81efbbab801b702f707 SHA-1: ee42c913cda74a074e13c5965fadff467e49824e SHA-256: 862373747c815c2b8c0fe7e9aa50182c493894d4e7655873d43efab26c654bc1
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/strik?utm_term=a+fine+balance+book+amazon PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4368251/normal_5fee30592e9db.pdfIn PDF document text
    • https://cdn.sqhk.co/gawagunikuw/ighhl06/2958180897.pdfIn PDF document text
    • https://cdn.sqhk.co/goluxewimabu/jfOxKo4/moto_racing_3d_java_games_320x240.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372681/normal_602ad53d20259.pdfIn PDF document text
    • https://cdn.sqhk.co/filomada/ijjd6fn/slime_maker_game.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402481/normal_6013e8b322975.pdfIn PDF document text
    • https://cdn.sqhk.co/setawigiz/jbKwijQ/absolute_rc_heli_simulator_full.pdfIn PDF document text
    • https://cdn.sqhk.co/wotezowedo/kujfzif/zowesu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410199/normal_6058a74989fa7.pdfIn PDF document text
    • http://liruzirese.22web.org/cardiovascular_system_pharmacology.pdfIn PDF document text
    • https://cdn.sqhk.co/vugasoveg/Ehgjg5f/loliwugubas.pdfIn PDF document text
    • https://cdn.sqhk.co/xarozowuzosa/U77ihhc/gangstar_vegas_world_of_crime_apk_rexdl.pdfIn PDF document text
    • https://cdn.sqhk.co/sigidezok/gf5zPk6/20590602135.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://39c1d623-eccb-4af0-a86a-15328a2d61f9.filesusr.com/ugd/3cb6cb_2ddfc19cb78341dd950d74f90683cf92.pdf?index=trueIn PDF document text
    • http://wusugan.rf.gd/tuxise.pdfIn PDF document text
    • https://f05e0dbb-21cf-40ea-8b71-00b8d6f49a3b.filesusr.com/ugd/b09e1d_d91a048214f24f848a7fde4bb85df904.pdf?index=trueIn PDF document text
    • https://a35b4eae-300a-44a5-b982-8d633984e519.filesusr.com/ugd/19735e_d143e496f2e748f99fe78e79ca9542ab.pdf?index=trueIn PDF document text
    • http://xawugepe.rf.gd/73335835570.pdfIn PDF document text
    • http://petizitopebil.epizy.com/beauty_plus_camera_old_version_free.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3FD 4996 bytes
SHA-256: 67a20c84fa96e0b3a02e4b31527b01e95216f27d6fb286be47e9b754f3ff9cd6
font_01_sfnt_off0000e503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE503 11452 bytes
SHA-256: 87e3cbf7733d3fa7aa60ae9f33ce751344f4ed9f781a66783403ff86f60becae
font_02_sfnt_off00010baa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAA 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15

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