Malicious PDF — malware analysis report

Static analysis result for SHA-256 178a3df47a4af764…

MALICIOUS

PDF

92.9 KB Created: 2021-03-28 15:51:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a3ee9d810d9d27e025990332d806b643 SHA-1: 16868061166fea6e05eed7ad42a558eee2bcbff4 SHA-256: 178a3df47a4af76412045e5ef1a7be731fad90a8f8be19cc2cd2fc3ac0721660
186 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. 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 0.9996

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://druttle.ru/strik?utm_term=deepak+chopra+7+spiritual+laws+of+success+summary PDF link annotation
    • https://lomivurusizova.weebly.com/uploads/1/3/4/8/134868764/4743340.pdfIn PDF document text
    • https://cdn.sqhk.co/sanevujaguda/ibgcCif/rubber_duck_shoes_size_8.pdfIn PDF document text
    • https://zanagolebiwom.weebly.com/uploads/1/3/4/9/134900312/josinunu.pdfIn PDF document text
    • https://cdn.sqhk.co/butuxolevu/hgx2hdN/jesotenutexomifopageb.pdfIn PDF document text
    • http://muvepifare.mygamesonline.org/67588687729.pdfIn PDF document text
    • https://cdn.sqhk.co/nemovofa/RShg8ii/teacher_appreciation_day_2020_free_food.pdfIn PDF document text
    • https://motadali.weebly.com/uploads/1/3/4/3/134368257/wigimawivilexeka.pdfIn PDF document text
    • https://cdn.sqhk.co/pemejurove/ghAmagj/20842794332.pdfIn PDF document text
    • http://pogawubujogeje.mypressonline.com/area_calculation_formulas.pdfIn PDF document text
    • https://cdn.sqhk.co/wefonasifaza/zjfhghx/viduduvixobawaz.pdfIn PDF document text
    • https://cdn.sqhk.co/kupodakojav/fiaiijj/cross_stitch_pattern_creator_software.pdfIn PDF document text
    • http://nugowimabu.mywebcommunity.org/red_dead_redemption_2_strategy_book.pdfIn PDF document text
    • http://zokazurimila.mygamesonline.org/adj_order.pdfIn PDF document text
    • https://cdn.sqhk.co/jorisuzil/jipwifF/super_mario_run_all_characters_unlocked.pdfIn PDF document text
    • https://tabuwesajusa.weebly.com/uploads/1/3/1/8/131856124/sewafo_dawis.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://fb413987-6e77-4bf1-aaa6-e97eb550fbee.filesusr.com/ugd/108936_13d234fc6b3349a69fa7dc56d1c503dd.pdf?index=trueIn PDF document text
    • https://72a23b54-95c1-47c0-80d6-f7b1310faeb8.filesusr.com/ugd/65b209_895d8e9583504eb8a98fa3fbd8258da2.pdf?index=trueIn PDF document text
    • https://30621b86-6952-4b41-80af-4d24d830bc7c.filesusr.com/ugd/122077_26e857f0e0aa491caaee62c6d22c182c.pdf?index=trueIn PDF document text
    • https://a5a7f18c-b887-48a0-80cc-3627c14345d5.filesusr.com/ugd/609f59_fff67e1519cc40708513d6d99b412ec7.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B84 5592 bytes
SHA-256: 8c51da4576fd5650af69cf041065fb033f54f8fbfc0507ce26664270a07b4283
font_01_sfnt_off00011e7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E7D 3008 bytes
SHA-256: 83ee758ea04b60e881461bd20a01d7ed40c633060ca4ae868c5d8b75527ef44b
font_02_sfnt_off00012b2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B2D 10384 bytes
SHA-256: f47bd4e88afe02ffb15c25dd074d3c3755cfd653a912c8bea468b177f09bab5a
font_03_sfnt_off00014ee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EE9 16092 bytes
SHA-256: e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848