Malicious PDF — malware analysis report

Static analysis result for SHA-256 24427ebda209860e…

MALICIOUS

PDF

76.6 KB Created: 2021-03-31 03:49:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: d802d62a4bb3d53a4c00fbf4f7aa0630 SHA-1: e7539588a7f678bbf14858fefac94e44614196e0 SHA-256: 24427ebda209860ed50e357419c0d422817cc3bc6bc6932b64914794da5369c2
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 0.9997

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://golowaki.ru/wix?keyword=song+of+myself+analysis+section+3 PDF link annotation
    • https://ragivigelogupow.weebly.com/uploads/1/3/4/5/134525503/gokipabu_xinoxete_nokisoloka_mobipabav.pdfIn PDF document text
    • https://cdn.sqhk.co/poniroxam/gg1rIig/water_sort_puzzle_level_105.pdfIn PDF document text
    • https://cdn.sqhk.co/busibelifiv/hL2vWih/anger_of_stick_3_game_download_for_android.pdfIn PDF document text
    • https://pugubitef.weebly.com/uploads/1/3/5/3/135302221/kudilun-lubup-xunana-gogow.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500882/normal_5fdfaf4735e8e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447089/normal_5feb62a8a5297.pdfIn PDF document text
    • http://getemob.iblogger.org/how_to_use_schumacher_battery_charger_sc1360.pdfIn PDF document text
    • https://nurosamemozixa.weebly.com/uploads/1/3/4/3/134375837/b7fea63cf7d.pdfIn PDF document text
    • https://cdn.sqhk.co/xibumediw/0Phg3Sa/jopaguditowodirodulur.pdfIn PDF document text
    • http://noriwisisun.iblogger.org/blue_ridge_parkway_map.pdfIn PDF document text
    • https://cdn.sqhk.co/koxixoneto/cqNZxgj/lenovo_tablet_e10_user_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/fufeboxeri/giihfji/teachers_assistant_pay_rate.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527902/normal_602e32675e241.pdfIn PDF document text
    • https://cdn.sqhk.co/zidulibu/iuEicSZ/impulse_response_function_formula.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408991/normal_604cb4e411cbe.pdfIn PDF document text
    • https://cdn.sqhk.co/wuzomowa/ghjjghg/27046142637.pdfIn PDF document text
    • https://mixabukosi.weebly.com/uploads/1/3/4/4/134479433/5238206.pdfIn PDF document text
    • https://cdn.sqhk.co/vumojakizaw/TKhaXhc/842652759.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://dce09894-55e7-49e1-9c43-b94069c58f23.filesusr.com/ugd/11ae40_c362338cafed4d28b66f1a34e4831b8f.pdf?index=trueIn PDF document text
    • https://02408c19-b9f6-4996-a596-1d5b7e46c8d3.filesusr.com/ugd/c83fdb_e65e1755c5f34d7581e92bc0f46dd854.pdf?index=trueIn PDF document text
    • http://zipavisaxa.epizy.com/how_to_factory_reset_samsung_c460fw_printer.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_off0000eac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC8 5472 bytes
SHA-256: 45563e21a0e8e717c4fc258f8392b534bb9bb246eb715a5ad094010431454f61
font_01_sfnt_off0000fd69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD69 11696 bytes
SHA-256: c05bba92b7b587c16c259dbef42014b5b1e6bf30ef0733816fd73ca963028963