Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1b42b3fb490900d…

MALICIOUS

PDF

74.0 KB Created: 2021-02-27 02:09:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: d85faf4ed877c510a24d6452ec981311 SHA-1: 4814831e0d867b767738afa411caa25458bb6e8d SHA-256: c1b42b3fb490900db83f67554a8e5a33c8b11a88ba4a52cd890a086f44b668dd
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF link farm' designed to host many PDFs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs suggest the document is part of a campaign to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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=twelve+prayers+of+st+bridget PDF link annotation
    • http://wulutapebime.getenjoyment.net/if_at_the_end_of_the_year_manufacturing_overhead_has_been_overapplied_it_means_that.pdfIn PDF document text
    • http://sawedes.mywebcommunity.org/what_companies_are_close_to_a_covid_19_vaccine.pdfIn PDF document text
    • http://sosyaltakipcipanelin.com/51980235970kt7dq.pdfIn PDF document text
    • https://naxozafo.weebly.com/uploads/1/3/1/4/131483391/90a447a59dc3b1e.pdfIn PDF document text
    • http://bas-vorota.ru/536764717795v2jv.pdfIn PDF document text
    • http://bebetadiruj.mywebcommunity.org/42786673411.pdfIn PDF document text
    • http://zememor.sportsontheweb.net/relative_location_of_perth_australia.pdfIn PDF document text
    • http://optarfes.com/48_laws_of_power_full_versionqpfo9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gezixus.myartsonline.com/the_outsiders_anticipation_guide_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/turip/fubew.pdfIn PDF document text
    • https://s3.amazonaws.com/wukevirenesu/wovizulegorinaweme.pdfIn PDF document text
    • http://ketabigumowun.atwebpages.com/ignatius_study_bible_online.pdfIn PDF document text
    • https://s3.amazonaws.com/fowonaxul/budget_spreadsheet_examples_household.pdfIn PDF document text
    • https://s3.amazonaws.com/xijuxosisomuna/paterodaronuzisex.pdfIn PDF document text
    • https://s3.amazonaws.com/genukopapovixo/integrated_reporting_and_sustainability_reporting.pdfIn PDF document text
    • http://kivozusemu.atwebpages.com/gulegokixunop.pdfIn PDF document text
    • http://bogalibamadom.myartsonline.com/fuvisazuravewupir.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_off0000e492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE492 5552 bytes
SHA-256: c308163f0eb85dd950b234614ec2fc0e80606402fb086eb22e622f75c6e6d5ba
font_01_sfnt_off0000f79d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79D 10328 bytes
SHA-256: 03537f4d13f778fefdf346ce12c78867310b1349af133020e834d44fc0370f46

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