Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc0a8c9a1a7731ab…

MALICIOUS

PDF

78.4 KB Created: 2021-03-21 07:43:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 032fa4a91ed34b1bce4445f61144b759 SHA-1: b82eaa536dd1f0457502cbfb004cee781d02eefc SHA-256: dc0a8c9a1a7731ab078f2a4a49fb2b3064062a464ee161e58b4480b775aa5d3c
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a lure related to 'Vivint thermostat hvac setup' and embeds numerous URLs, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to lead users to external, potentially harmful, content.

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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://botokaw.ru/strik?utm_term=vivint+thermostat+hvac+setup PDF link annotation
    • https://cdn.sqhk.co/lexijunibul/IjhOpig/98689413695.pdfIn PDF document text
    • http://tuimag.ru/25292340276ytxty.pdfIn PDF document text
    • https://cdn.sqhk.co/saxedade/ehhc9hg/report_a_lost_driver_s_licence_ontario.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384652/normal_603502805cde2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367646/normal_601de1b5e3301.pdfIn PDF document text
    • http://biggymstoe.com/fallen_lauren_kate_ita3izk0.pdfIn PDF document text
    • https://nironaguvotu.weebly.com/uploads/1/3/4/5/134530025/2add3969d5a59c0.pdfIn PDF document text
    • http://neuroncraft.online/57357190917qo89v.pdfIn PDF document text
    • https://vemusosafuz.weebly.com/uploads/1/3/1/3/131398108/b821596d.pdfIn PDF document text
    • https://bonavipopugob.weebly.com/uploads/1/3/2/3/132302892/0f8ec26c80f5.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/a2759f14-dcac-464a-b425-559f62212dbc/23393083177.pdfIn PDF document text
    • http://zowujobosega.rf.gd/xesux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4e9e406-5534-4f8b-ae95-53f5b7c2ebc4/28500092251.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d68a097c-454b-4fb4-9e01-fda845d26af1/84147495804.pdfIn PDF document text
    • http://vifowas.epizy.com/bio_sketch_format_cbse_class_9.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e35b08d9-122e-47c6-b35c-8a1339f8f956/kirabifanavurun.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_off0000f6d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D6 5168 bytes
SHA-256: 8846e2fb0e9fff545c1281972e959717d5939f2255eba5113b04ac41c4bee42d
font_01_sfnt_off00010844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10844 10768 bytes
SHA-256: 4c5cb779e37d672e0aac32cb6e74c35a907db8918747137aee688f8f2d17db4a

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