Malicious PDF — malware analysis report

Static analysis result for SHA-256 87a00b707e5545c8…

MALICIOUS

PDF

99.5 KB Created: 2021-04-04 15:24:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 33ea05d5dbd1c3565776778af765bb88 SHA-1: edb7e5c901bca0ac107af69b2acdc076c119afe9 SHA-256: 87a00b707e5545c8a328aed16844fd2bac9e8cc93db6b2d1025bba3d25fb2555
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains and potentially malicious content, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ClamAV detection and ML classifier also strongly suggest malicious intent. While no scripts were explicitly extracted, the structure and URL patterns are consistent with phishing or SEO spam campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://lozipotod.ru/wix?keyword=contemporary+society+examples PDF link annotation
    • https://cdn.sqhk.co/zosiwikiw/fieXigd/98586900269.pdfIn PDF document text
    • http://esportzmlevent.com/how_to_fix_a_school_chromebook_screen3a7sj.pdfIn PDF document text
    • https://cdn.sqhk.co/wezufunin/evhLoij/84532188494.pdfIn PDF document text
    • http://nogurufegu.mygamesonline.org/dumavuxujiwatabikezu.pdfIn PDF document text
    • https://cdn.sqhk.co/pixorikibam/jgzSgdO/the_room_place_customer_service.pdfIn PDF document text
    • http://msertis.xyz/lurusuwapedewapam4lqyb.pdfIn PDF document text
    • https://cdn.sqhk.co/kitujesijak/hafvjjs/surosizagu.pdfIn PDF document text
    • https://cdn.sqhk.co/devisofage/zNijrji/cut_off_the_head_of_medusa.pdfIn PDF document text
    • http://kifisafobubupo.mygamesonline.org/kitaxedovawapek.pdfIn PDF document text
    • http://derilezin.sportsontheweb.net/tlcharger_gratuitement_cours_automatisme.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/444459f4-5ce3-47e9-ab86-19ae6b04b8de/85851926245.pdfIn PDF document text
    • https://be5a03d2-cb36-429a-bb4d-4773f067dd3b.filesusr.com/ugd/b46ca8_5574079d4a3448a2828d350e6374a237.pdf?index=trueIn PDF document text
    • https://a5fc3680-5c08-4cda-bd6c-abaa3bdf25bc.filesusr.com/ugd/ea5d7b_78fc893ca57749ee835c9c5b34beda8c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/daf3d076-9fca-4556-b8b8-578998038ca9/husqvarna_550_xp_price_usa.pdfIn PDF document text
    • https://2aa0b900-127f-4603-a19a-6a731d3c9eb1.filesusr.com/ugd/5eaffa_876251063735491cb9800c9c1e81d02e.pdf?index=trueIn PDF document text
    • https://56352102-112a-4456-a677-0775450c4ed3.filesusr.com/ugd/ed4e87_78f7e0aacf734e839a920acb020c9291.pdf?index=trueIn PDF document text
    • https://e50eee24-2d95-422d-8083-6f618d95927b.filesusr.com/ugd/594ae5_a9790a4e63714e918a6b02a9c2052a49.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef2afd66-77d4-4fd8-a3b1-8a176008b7f1/fuxaki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91fac1f9-7d48-46af-9d36-72cf17a5676b/74530474446.pdfIn PDF document text
    • http://noratev.myartsonline.com/dreamweaver_cc_2020.pdfIn PDF document text
    • https://1c437d0a-cccb-4a8a-93f1-39e0b5126915.filesusr.com/ugd/b91566_072c6b40e2594ed7bc511b751ef1628c.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_off00014ada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14ADA 5156 bytes
SHA-256: fb26c1fe3c76c5f12d51f6ef7cd4c2e15702bbd0083d86ff2be6360ecc51f8bb
font_01_sfnt_off00015c52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C52 10496 bytes
SHA-256: 7e53df3eb723154c44994c02b84b00742d8ae212f51965881844772e6891cb56