Malicious PDF — malware analysis report

Static analysis result for SHA-256 234daac527b5da37…

MALICIOUS

PDF

72.8 KB Created: 2021-03-16 19:23:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 01d3a77ec90cb72bff095519be6d8ae8 SHA-1: 44bf50024e4051ae8ae793645f21c88023e62680 SHA-256: 234daac527b5da37ffcbea70aebc891477320147ca4b5318b596c0ee37fa2588
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://nipisod.ru/wix?keyword=tzumi+true+wireless+earbuds+pairing PDF link annotation
    • https://cdn.sqhk.co/zetanitanedo/iejajiX/24754764168.pdfIn PDF document text
    • http://kenugizi.getenjoyment.net/3654145584.pdfIn PDF document text
    • https://jugurapofan.weebly.com/uploads/1/3/4/3/134339640/wabexapafamiw.pdfIn PDF document text
    • https://cdn.sqhk.co/sadetujadufi/ihghjgs/hot_wheels_race_off_mod_apk_download.pdfIn PDF document text
    • https://fosegeluka.weebly.com/uploads/1/3/4/7/134717840/06ec2f.pdfIn PDF document text
    • https://bumeguzi.weebly.com/uploads/1/3/5/3/135391430/18525a34ec.pdfIn PDF document text
    • https://numetigovav.weebly.com/uploads/1/3/1/6/131606493/6489541.pdfIn PDF document text
    • http://getepitisux.mywebcommunity.org/in_the_heart_of_the_sea_chapter_7_summary.pdfIn PDF document text
    • https://wifevotus.weebly.com/uploads/1/3/4/8/134897576/7487103.pdfIn PDF document text
    • https://netigobulon.weebly.com/uploads/1/3/4/0/134096742/jurejazivoramiruwane.pdfIn PDF document text
    • https://dipilewojariwu.weebly.com/uploads/1/3/2/8/132814651/4487994.pdfIn PDF document text
    • http://xifadezuzurap.medianewsonline.com/pharmacology_textbooks_free.pdfIn PDF document text
    • https://wisowoturap.weebly.com/uploads/1/3/1/4/131453432/kijar_lapelapedub_nofupemapilis_nowejewem.pdfIn PDF document text
    • https://buzowupe.weebly.com/uploads/1/3/1/4/131483044/jobudibu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fuvuvadut.onlinewebshop.net/kenmore_elite_36-inch_over-the-range_microwave_oven.pdfIn PDF document text
    • https://e97408dc-4b05-4e3b-9f19-f4127feb49ef.filesusr.com/ugd/a42eed_83329d99d35245829bcf6848ecd30baf.pdf?index=trueIn PDF document text
    • https://4d75d3c9-3a4d-4df6-84ab-e48b83d723e5.filesusr.com/ugd/cdb50c_c6ae707403544760b134e752d0799405.pdf?index=trueIn PDF document text
    • http://vekisofekibote.myartsonline.com/gexivowezobarez.pdfIn PDF document text
    • http://tuminexozuvino.atwebpages.com/dipanifuzubisofevalor.pdfIn PDF document text
    • http://makakanow.onlinewebshop.net/itil_v3_foundation_course_material.pdfIn PDF document text
    • https://3f46bf15-0a8c-4e80-b3e5-a2e3bf90e008.filesusr.com/ugd/8e6e76_8d7a26ebb0e34b9c82026f4227b33216.pdf?index=trueIn PDF document text
    • https://b2f3f1fb-4f3f-4d5d-be65-f5b10dce6288.filesusr.com/ugd/735189_1cf72eee0f944fcd9cce912f9d5204e9.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_off0000dc96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC96 5508 bytes
SHA-256: 8d54e4ea6a3cf51a09c717fa5f90c9ac9191e233c0f4dceda5d10c19a16b1084
font_01_sfnt_off0000ef47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF47 10824 bytes
SHA-256: 73ce951563836ecb00c572586e788e045e6cc57ea4f4ca9c1df06df87928ba57