Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fd554a17ee0aece…

MALICIOUS

PDF

79.7 KB Created: 2021-04-02 10:05:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0d6696b73edeecbe50280fb53921d80c SHA-1: 9e3b795acc3c0975ab97298559817eb67ea749d6 SHA-256: 8fd554a17ee0aece52e0a9ead86c6fcc91a2ecf3493febe1ac1d958cdd76216d
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/award?keyword=car+accident+checklist+pdf+uk PDF link annotation
    • https://pomisefinare.weebly.com/uploads/1/3/4/9/134902228/pikatimiv.pdfIn PDF document text
    • http://vvd.bar/36998576267xyeex.pdfIn PDF document text
    • https://dudosixe.weebly.com/uploads/1/3/4/3/134323580/rovoxoros.pdfIn PDF document text
    • http://monubagujizud.mywebcommunity.org/lapsus_bronkopneumonia_anak.pdfIn PDF document text
    • http://lnstagramsupportinfo.com/67085343032s7r0q.pdfIn PDF document text
    • http://morasufas.iblogger.org/2128489987.pdfIn PDF document text
    • http://mists.space/7539504198g5191.pdfIn PDF document text
    • https://wiwupaluw.weebly.com/uploads/1/3/1/6/131606778/2879817.pdfIn PDF document text
    • http://50offshop.info/tesisobazz6gvk.pdfIn PDF document text
    • https://vazagivire.weebly.com/uploads/1/3/4/8/134874695/fetakew.pdfIn PDF document text
    • http://teaapple.space/74845123354j6jpe.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
    • http://sinusudixuxuwad.atwebpages.com/xeweligezexexezid.pdfIn PDF document text
    • http://satelogagolibo.rf.gd/charles_shirley_jackson_plot_diagram.pdfIn PDF document text
    • http://jilutuve.rf.gd/game_furious_payback_racing_mod_apk.pdfIn PDF document text
    • https://5ce19dfa-329f-495d-88d1-e1e7834d9072.filesusr.com/ugd/d902bb_92d9975f843c4e72a1de7b1523e9ea9c.pdf?index=trueIn PDF document text
    • https://c941d99d-b58b-4215-81ce-525e38db2b81.filesusr.com/ugd/2dc4cf_45d75b302c6b40c298bfe31cbeeae428.pdf?index=trueIn PDF document text
    • http://fetevatakipip.epizy.com/biology_lab_safety_rules.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_off0000ed66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED66 5104 bytes
SHA-256: 8e5f9c2ac799d87c11e25e01ec2c86e99c7060542584904218db86463ff37d35
font_01_sfnt_off0000feb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB5 10904 bytes
SHA-256: 334919481385133b3e4cfa8a119e44cbb1fb535a49bde4e2fbbee2f3839557f0
font_02_sfnt_off000123c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C1 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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