Malicious PDF — malware analysis report

Static analysis result for SHA-256 621d6b5cb456849c…

MALICIOUS

PDF

69.6 KB Created: 2021-03-22 14:32:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: a4f4c4d7b1014731dee302cba5a10fd3 SHA-1: 584363d44b9d21c78e95282c2c8481d5c4219cea SHA-256: 621d6b5cb456849cfd1a8f344c2539cbc960124a3e60667abc95412638474c2e
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 0.9991

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://fokemale.ru/strik?utm_term=how+to+use+skinkraft+cleanser PDF link annotation
    • https://cdn.sqhk.co/dedesonor/ii8UBgi/black_friday_archery_deals_2018_boots.pdfIn PDF document text
    • https://jejepijukutu.weebly.com/uploads/1/3/4/1/134131362/botamabe-jovaf-losakebazo-bugisujubesevew.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449397/normal_5fe1a3f22f3b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373304/normal_60402c4baeb7b.pdfIn PDF document text
    • https://cdn.sqhk.co/xidupesijij/gg2iaid/4524052751.pdfIn PDF document text
    • https://cdn.sqhk.co/fagaxirupunu/hbNNUgf/55224156688.pdfIn PDF document text
    • https://cdn.sqhk.co/zezetemirag/gBhdgdL/70144391294.pdfIn PDF document text
    • http://vixegoxufareka.getenjoyment.net/bose_remote_control_code_for_samsung_tv.pdfIn PDF document text
    • https://cdn.sqhk.co/pujixefan/Diif6hd/buboxirexenuponiwuzix.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460946/normal_5fdf4b4503b37.pdfIn PDF document text
    • https://cdn.sqhk.co/ramazunor/cX1jijj/cute_captions_for_pics_with_your_bf.pdfIn PDF document text
    • https://vuporevebupo.weebly.com/uploads/1/3/0/8/130873771/mitupikogula-lesiniwavuruvo.pdfIn PDF document text
    • https://cdn.sqhk.co/jevamivuvugi/yUibYAY/pc_creator_pc_building_simulator_wiki.pdfIn PDF document text
    • https://dibozuvoba.weebly.com/uploads/1/3/4/6/134692955/julonireme.pdfIn PDF document text
    • https://kiwakobomu.weebly.com/uploads/1/3/1/4/131482833/wubarewutazaxed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377935/normal_5fd7df41a30b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446399/normal_6024a39cb7eed.pdfIn PDF document text
    • https://cdn.sqhk.co/davusegeb/b9mhewq/drawing_board_games_with_friends.pdfIn PDF document text
    • https://neriborotarisim.weebly.com/uploads/1/3/4/3/134345051/najuzofariwazisaso.pdfIn PDF document text
    • https://cdn.sqhk.co/bunigenozav/ahcejid/polezulesovalelusez.pdfIn PDF document text
    • https://dataremidesop.weebly.com/uploads/1/3/4/6/134697992/2236367.pdfIn PDF document text
    • https://kufojinelimipi.weebly.com/uploads/1/3/0/7/130776518/mefuvojazurajetoj.pdfIn PDF document text
    • http://sijubuwejipamun.mywebcommunity.org/26004936474.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tivakifuzir.atwebpages.com/bevedemeg.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E3 4992 bytes
SHA-256: bc0b5ff5291b04696a38380d1c4ae30075fccfdfead09e3904639891df13c415
font_01_sfnt_off0000e200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE200 11616 bytes
SHA-256: 68d60877c2e9145ada4a97d7526af0e66901ab9e354f22474b16937e7c713670