Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f6979b1b0b00c79…

MALICIOUS

PDF

75.8 KB Created: 2021-03-28 13:04:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: bfb5535b6f76fc1fdd54e829f5fb7514 SHA-1: 4c18f59e65df56383bb9a4ce0fd593401547e2cf SHA-256: 1f6979b1b0b00c791f49f11a8d6f701e1c093e1540d93deda253fc7fc604424f
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://fokemale.ru/123?utm_term=git+branching+tutorial+pdf PDF link annotation
    • http://baxusajatos.sportsontheweb.net/92693971872.pdfIn PDF document text
    • http://zaxobus.iblogger.org/grouping_symbols_lesson_1._12_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/wularumijif/Ijejcie/basizelemiwakojizi.pdfIn PDF document text
    • https://tebiwexarug.weebly.com/uploads/1/3/1/3/131380746/dedogufixuriro-kabugotepu-gonese-jimupunojumena.pdfIn PDF document text
    • https://zipixaxunisegon.weebly.com/uploads/1/3/4/6/134625234/869858a.pdfIn PDF document text
    • https://kufuzuve.weebly.com/uploads/1/3/4/5/134589172/werapir-wetunisuzudiwuk.pdfIn PDF document text
    • https://cdn.sqhk.co/jarixizotib/jbggHha/53574856439.pdfIn PDF document text
    • http://mavigawika.scienceontheweb.net/best_html5_books_for_beginners.pdfIn PDF document text
    • http://nekidifuton.medianewsonline.com/65810871055.pdfIn PDF document text
    • https://cdn.sqhk.co/gimexigerub/DLhgdgh/97370160053.pdfIn PDF document text
    • http://fuvisetitisenon.mypressonline.com/bhagavad_gita_in_sanskrit_with_tamil_translation.pdfIn PDF document text
    • https://sufudoni.weebly.com/uploads/1/3/4/8/134853368/282d77a4d69.pdfIn PDF document text
    • http://zijezokoriwe.iblogger.org/advanced_java_concepts_with_examples.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://zawagebojirowe.rf.gd/double_sided_business_card_template_pages.pdfIn PDF document text
    • http://mukoluduxoge.rf.gd/html5_buttons_template.pdfIn PDF document text
    • https://1afae0f6-9e35-4dc9-9db7-5dbf78511926.filesusr.com/ugd/afe78f_9d0a0cb21e1e42249830a654fec9e196.pdf?index=trueIn PDF document text
    • https://b3d988c2-7a7d-4c3c-9141-221b6550481e.filesusr.com/ugd/9dda13_2100654babf640ceb3513630686161ac.pdf?index=trueIn PDF document text
    • http://dasowarixolusix.rf.gd/47129113384.pdfIn PDF document text
    • http://werewej.epizy.com/gebafatabozar.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_off0000df1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1A 5176 bytes
SHA-256: dec5ebd5c9c01b6fecdf70c533b203aff4847ce124525ca244b16bf4ca3992ad
font_01_sfnt_off0000f0a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A3 10336 bytes
SHA-256: 71b21f6a42a3c66cda612f27232ac09152dcfea0044600e347795d42f551b899
font_02_sfnt_off000113e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E4 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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