Malicious PDF — malware analysis report

Static analysis result for SHA-256 d81f6aec5d3fd341…

MALICIOUS

PDF

61.0 KB Created: 2021-01-30 14:21:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a50bc31dc0adc4ae5a45e20823022880 SHA-1: 91d34fd4382ec96d0cc6ed60828d67654c571682 SHA-256: d81f6aec5d3fd34154237ac37df3b4067c59c07651c72aa0ae1286353d5edf21
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document employs a social engineering lure, instructing the user to install a browser extension or update to view content. This is a common tactic to trick users into downloading malware or revealing credentials. The document also contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO poisoning attempt. ClamAV detected this file as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://maypoin.ru/wb?keyword=sea%20bird%20landscaping%20llc%20reviews PDF link annotation
    • https://kemivepume.weebly.com/uploads/1/3/1/4/131407144/1731513.pdfIn PDF document text
    • http://salopkisa.website/hq_caverna_do_drago_finalnzujc.pdfIn PDF document text
    • https://dedolodaramolon.weebly.com/uploads/1/3/1/4/131455072/jexomofetafesal.pdfIn PDF document text
    • https://kozamewibigox.weebly.com/uploads/1/3/0/8/130874388/2132790.pdfIn PDF document text
    • https://cdn.sqhk.co/zamodozitip/jjd2igO/puvapadenol.pdfIn PDF document text
    • https://lenonexijinex.weebly.com/uploads/1/3/4/6/134647177/3470774.pdfIn PDF document text
    • http://astrology-personal.online/ian_dury_and_the_blockheads_tribute_bandslashs.pdfIn PDF document text
    • https://wiromokuxuzub.weebly.com/uploads/1/3/5/2/135298753/wegonaxovazafe-sukelolebolef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480582/normal_5fd699792dbe8.pdfIn PDF document text
    • https://sowurudiz.weebly.com/uploads/1/3/1/4/131438308/2fabf064ec1c5.pdfIn PDF document text
    • http://apparentlyopt.com/werewolf_game_cardspoe12.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480878/normal_5feee8cf6cdc4.pdfIn PDF document text
    • https://mefupajudeto.weebly.com/uploads/1/3/4/8/134883840/013e7.pdfIn PDF document text
    • https://cdn.sqhk.co/kekelivig/wjejjxh/black_survival_wiki_vn.pdfIn PDF document text
    • https://folutiniku.weebly.com/uploads/1/3/1/8/131871586/jimolox_nufevafokolupin_nokifoga_rofifokopim.pdfIn PDF document text
    • http://naturmilans.fun/best_free_piano_keyboard_app_for_androidhuuxq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000b290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB290 5636 bytes
SHA-256: 0e8ae0718cc8b16d9861eb9a0a2c6e8cbccfe9e03c4bbfdd4cf4cf5c7f943aec
font_01_sfnt_off0000c5d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5D7 9968 bytes
SHA-256: 32be1c6d7d79fbe123ceefba0e8dfc02b23febc99150438e05c98d1bdffe1866

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