Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d1f39192de70908…

MALICIOUS

PDF

80.0 KB Created: 2021-03-31 04:05:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 1f42647709dbbc8d7d383a2f8d66653b SHA-1: 2f9ae0529d3d488788e988583a504a62b1841a61 SHA-256: 3d1f39192de7090840dc355b7dc13bd1dd5e77ece45796a40245b0beac6cf47e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was 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, forming a link farm hosted on disposable domains, with one primary link pointing to a URL containing 'strik' and a search query. The document body is heavily obfuscated and appears to contain metadata related to its generation by wkhtmltopdf, but no clear user-facing content. The presence of a link farm suggests an attempt to manipulate search engine results or direct users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://gimoguvi.ru/strik?utm_term=carry+on+my+wayward+son+lyrics+video PDF link annotation
    • https://junenewawaxi.weebly.com/uploads/1/3/1/4/131407408/5221065.pdfIn PDF document text
    • http://tinubawolu.mywebcommunity.org/ruvinuvefosojegew.pdfIn PDF document text
    • http://luxibenuguk.getenjoyment.net/2163445441.pdfIn PDF document text
    • http://dujifasuda.iblogger.org/wavefront_obj_file_free.pdfIn PDF document text
    • https://ratopavitakam.weebly.com/uploads/1/3/4/4/134460251/xepuronegutonik-fumiwebupikebux-lawilesibe-rasiwipavinod.pdfIn PDF document text
    • http://ruxenawuxovogu.getenjoyment.net/84916946917.pdfIn PDF document text
    • http://nakozek.mypressonline.com/listado_de_medicamentos_y_para_que_sirven.pdfIn PDF document text
    • https://tivuwamivubi.weebly.com/uploads/1/3/5/3/135384825/9370997.pdfIn PDF document text
    • http://maxirem.mygamesonline.org/agilent_gc_columns.pdfIn PDF document text
    • http://gotiwekiz.iblogger.org/4737127176.pdfIn PDF document text
    • https://pukapukipek.weebly.com/uploads/1/3/4/6/134636258/zagalok-rotizodu-weloto-zunifid.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/821191ba-d9e1-44a3-8bb7-78b3d8055bb5/kisivozozelufunowule.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afdb448c-a61d-4d70-ac06-0da8e8d261a1/42621679451.pdfIn PDF document text
    • http://visunes.myartsonline.com/management_of_neurological_disorders.pdfIn PDF document text
    • http://jabodegodonirad.atwebpages.com/dell_latitude_d830_ram_replacement.pdfIn PDF document text
    • http://pawekixezad.epizy.com/form_required_to_increase_authorised_share_capital.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/446c4149-ed88-4a90-9ada-812893d05a53/oscar_wilde_the_importance_of_being_earnest_quotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb10eb10-ed1f-4c84-8e06-e76d4cfd67ad/lista_de_verbos_regulares_en_ingles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e84f6ba5-8f6a-48e4-9ca1-ecbfc8263dbc/moodjuice_anxiety.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9aede96a-f867-40c6-9f3d-11c5f765d849/al_quran_with_english_transliteration.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfe895af-a559-403e-99b3-cee7649a0b3c/duroravol.pdfIn PDF document text
    • http://nudibiwer.epizy.com/65976990606.pdfIn PDF document text
    • http://ditajizuru.rf.gd/aeon_flux_2005_tamil_dubbed_movie.pdfIn PDF document text
    • http://liraperuwuw.atwebpages.com/39054536523.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED41 5068 bytes
SHA-256: b8f347f97e38fd822aabaa8fafa5323ad441c062be63f5a7208d2057faa5f265
font_01_sfnt_off0000fe79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE79 11116 bytes
SHA-256: 0a82919ba0cabfb0903417367d3331ffece08fceebf97c2dbdc7c54754223e1f
font_02_sfnt_off00012448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12448 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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