Malicious PDF — malware analysis report

Static analysis result for SHA-256 01c62937b1b13af9…

MALICIOUS

PDF

76.1 KB Created: 2021-03-08 16:48:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: bb97d46f4daa3ab7b8fbe04348478762 SHA-1: f26342849e2c2bd264c3a2b7166e7d1c7a223e3e SHA-256: 01c62937b1b13af9a27598c0f3c6204051d27174959e991017848cfd0b51cef4
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which are hosted on disposable domains, suggesting a link farm or phishing attempt. The document's content is obfuscated, but the presence of external URIs and the ML classifier's high confidence score indicate malicious intent. The ClamAV detection also confirms this, identifying it as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/strik?utm_term=what+are+the+best+colleges+to+go+to+for+interior+design PDF link annotation
    • https://xavujome.weebly.com/uploads/1/3/0/7/130739328/7793406.pdfIn PDF document text
    • https://lijowuvum.weebly.com/uploads/1/3/4/6/134624244/zetijesek_pilumilodox_jamafoder_befaginelunuvi.pdfIn PDF document text
    • https://zasevolonuto.weebly.com/uploads/1/3/5/3/135335071/tuxogedem_jifizosogud_renexomuwifite.pdfIn PDF document text
    • https://pemiliruvobavex.weebly.com/uploads/1/3/0/7/130739389/volekum.pdfIn PDF document text
    • https://raputaluwim.weebly.com/uploads/1/3/1/6/131606275/9168145.pdfIn PDF document text
    • https://jowesezowu.weebly.com/uploads/1/3/4/3/134366841/363613.pdfIn PDF document text
    • https://turakenedonatup.weebly.com/uploads/1/3/4/6/134610331/fuvufar-vasefe-gibotafaki.pdfIn PDF document text
    • https://puxupukesif.weebly.com/uploads/1/3/0/8/130813524/1273955.pdfIn PDF document text
    • https://buparemekixa.weebly.com/uploads/1/3/0/7/130739227/1367938.pdfIn PDF document text
    • https://tunegize.weebly.com/uploads/1/3/4/5/134500295/sumajamifife_sekoperipuk.pdfIn PDF document text
    • https://wugedelujexot.weebly.com/uploads/1/3/1/4/131456191/1627797.pdfIn PDF document text
    • https://vulalubog.weebly.com/uploads/1/3/4/8/134862436/8699149.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xuvamuba/auto_format_code_notepad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce74f1de-8bdc-4c9c-8225-07e45b994c80/simplifying_trigonometric_expressions_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be90665d-05fd-4a20-a116-16e881316aeb/76323707396.pdfIn PDF document text
    • https://s3.amazonaws.com/kisagoz/can_covid_cause_high_blood_pressure_and_heart_rate.pdfIn PDF document text
    • https://85fc0914-20e3-4f1c-be8c-de7e6f89f47e.filesusr.com/ugd/a44510_18faccab3c8b4e4c95b4566f4a05819b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f28962f-9469-449d-b09f-18df7f653493/what_do_irises_symbolize.pdfIn PDF document text
    • https://s3.amazonaws.com/janodojivi/46372298980.pdfIn PDF document text
    • https://s3.amazonaws.com/tinezedu/sedepukogajejemakavifu.pdfIn PDF document text
    • https://7e073981-ad1c-4081-8dc0-76946ba36063.filesusr.com/ugd/c4f63d_805e52593d7444aab0c32c8427cc48c9.pdf?index=trueIn 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_off0000eb03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB03 5436 bytes
SHA-256: f6b8f636208c2bb3233c0ba1b2e79a80c0a33d353ac0b4e180745e321bbf129a
font_01_sfnt_off0000fd83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD83 10552 bytes
SHA-256: 29ab41a5f6c6736ad353edc93dfdfee58ed7372cb44bc180a779b94ea8884f54