Malicious PDF — malware analysis report

Static analysis result for SHA-256 54fee3fc792e62fa…

MALICIOUS

PDF

81.5 KB Created: 2021-03-14 18:44:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6c58abeb21b7617c6310d44b061ac3a9 SHA-1: 1366b1651f2c90de3f19e4d8fa9dd1992933225f SHA-256: 54fee3fc792e62fad1642ffb30d374f601d89d345a9fe09146a9c147893a8a45
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://jumiwimov.ru/strik?utm_term=investing+books+for+beginners+pdf PDF link annotation
    • https://lugijuvumefabi.weebly.com/uploads/1/3/4/7/134761930/4330223.pdfIn PDF document text
    • https://pijaxulejogelub.weebly.com/uploads/1/3/0/8/130874219/68fd1d0d.pdfIn PDF document text
    • http://mutujejeturuduf.medianewsonline.com/44602894718.pdfIn PDF document text
    • http://secureappeal.com/la_gallina_degollada_horacio_quiroga_completodpya4.pdfIn PDF document text
    • http://nickned.me/50_tons_de_cinza_completo31qw4.pdfIn PDF document text
    • http://stopro.store/vuvapoturibaju8chug.pdfIn PDF document text
    • https://bilemupu.weebly.com/uploads/1/3/4/6/134654663/zadimexevisonale.pdfIn PDF document text
    • http://hotelhouze.ru/alarmy_android_apphotjr.pdfIn PDF document text
    • https://zobanegasub.weebly.com/uploads/1/3/1/1/131164549/5164687.pdfIn PDF document text
    • https://wanalepawipetep.weebly.com/uploads/1/3/1/8/131857983/4012929.pdfIn PDF document text
    • http://lopixerirerenex.mywebcommunity.org/alelopatia_en_hortalizas.pdfIn PDF document text
    • https://ketadamofexawun.weebly.com/uploads/1/3/5/3/135349072/ad45658f812.pdfIn PDF document text
    • http://italdom.fun/angular_4_template_driven_forms_custom_validationobd22.pdfIn PDF document text
    • http://dizurexemubegog.mygamesonline.org/what_is_the_reason_for_printer_offline.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://abee6ad4-cf47-459a-954e-22b9b9bb30ad.filesusr.com/ugd/4bdc6d_a75508b3f48f4a3280da5e6e2817d424.pdf?index=trueIn PDF document text
    • https://2ea9429b-0332-4ee6-bb75-ab9535b56c99.filesusr.com/ugd/e2f7e1_c3a010a8ab9f46e8ba76b77b2f053a26.pdf?index=trueIn PDF document text
    • http://molagegivijoxu.onlinewebshop.net/78481102707.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_off0000f419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF419 4956 bytes
SHA-256: 0a8d7f2b09778de4fa1b7a5bab16dea0eb53e20ae0404e5922580ea417e5e9fc
font_01_sfnt_off000104fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FC 10976 bytes
SHA-256: 8175875c92e534d082cd58bd638a393b5186a7699e60e0ea95ab388659594f89
font_02_sfnt_off00012a92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A92 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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