Malicious PDF — malware analysis report

Static analysis result for SHA-256 86b1d8dc90e3244c…

MALICIOUS

PDF

74.2 KB Created: 2021-06-11 21:59:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 6553434fd078c1e55641b213831d5fc3 SHA-1: 6b8c77e11ac8aebac6d20db749bb6df8487a37ac SHA-256: 86b1d8dc90e3244c18b2266059e3689f2fd83e14774ddaf8f0dfafa450998841
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The embedded content, though heavily obfuscated, likely serves to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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://garglob.ru/pbw?utm_term=lightsaber+fighting+techniques PDF link annotation
    • https://fawewetipe.weebly.com/uploads/1/3/1/3/131379545/nidijosajokofi.pdfIn PDF document text
    • https://zomoxiwoginu.weebly.com/uploads/1/3/1/6/131637743/8915748.pdfIn PDF document text
    • https://mifetajuluvonu.weebly.com/uploads/1/3/4/6/134610270/pugazina.pdfIn PDF document text
    • https://zopogunonezaso.weebly.com/uploads/1/3/1/6/131637395/ea2a8f4e72.pdfIn PDF document text
    • https://vifesomojijafi.weebly.com/uploads/1/3/4/3/134337648/bilabezupefaxoge.pdfIn PDF document text
    • https://pukexomupuko.weebly.com/uploads/1/3/1/1/131164185/8940132.pdfIn PDF document text
    • https://wovuposekase.weebly.com/uploads/1/3/4/6/134613379/42458.pdfIn PDF document text
    • https://gixakipero.weebly.com/uploads/1/3/1/4/131412713/8125018.pdfIn PDF document text
    • https://zuxolawez.weebly.com/uploads/1/3/4/1/134109286/minunaxuvegaxa.pdfIn PDF document text
    • https://xapodopuk.weebly.com/uploads/1/3/1/8/131856257/bc4a7f5112bec.pdfIn PDF document text
    • https://webenewosa.weebly.com/uploads/1/3/1/4/131409170/4586358.pdfIn PDF document text
    • https://xebexusutawa.weebly.com/uploads/1/3/4/5/134502291/f8f07.pdfIn PDF document text
    • https://vopakumadojaga.weebly.com/uploads/1/3/4/3/134361244/86a691e4e.pdfIn PDF document text
    • https://momibugu.weebly.com/uploads/1/3/4/6/134674353/9791849.pdfIn PDF document text
    • https://wunogalabapa.weebly.com/uploads/1/3/4/6/134603674/5978027.pdfIn PDF document text
    • https://boginajidu.weebly.com/uploads/1/3/4/6/134693166/lixuxofakifimoz-rimolazabevo-raduwivirifu-vojogozetav.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/bc17c3b9-9ae6-4605-b94c-09050cd6146a/dosage_calculation_quiz.pdfIn PDF document text
    • http://zevatirupura.pbworks.com/f/what_roles_do_fate_and_free_will_play_in_macbeths_destruction.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d55568be-4ba7-4828-8b86-ab40cd79c1e2/can_i_add_directv_app_to_my_vizio_smart_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5811780-2599-41a4-a9b4-8161badadf0f/70028095120.pdfIn PDF document text
    • http://josinibugaju.pbworks.com/w/file/fetch/145133403/88660508183.pdfIn PDF document text
    • http://mogulazedub.pbworks.com/w/file/fetch/144512301/past_simple_irregular_verbs_list_elementary.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_off0000e4ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AB 5316 bytes
SHA-256: 920136799340e6ba5033407fdfff5d1c14e42dec7cecd1a5f58115a69d72e0ea
font_01_sfnt_off0000f6c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C4 10952 bytes
SHA-256: 3e9b8ddce3df1f9ff077d37263ef1a5d89b59de5a75890a8ef3bb10b3729724e