Malicious PDF — malware analysis report

Static analysis result for SHA-256 77ef0b6c5581e236…

MALICIOUS

PDF

84.7 KB Created: 2021-05-13 01:03:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 1b26defaaab5f73e1f3f0e9ef107a854 SHA-1: 282f7e875b83862a2cb11cd5f05c3ea2bb98513c SHA-256: 77ef0b6c5581e236f009084ebe63dcac7882a7c2ea81b1a31ae5490127b75993
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links, with critical heuristics identifying it as a malicious redirector and a link farm. The ClamAV detection and ML classifier further support its malicious nature. The primary goal appears to be directing users to potentially harmful external websites, consistent with phishing or malware distribution tactics.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=trombosis+pulmonar+sintomas+y+tratamiento In PDF document text
    • http://xumugawejal.scienceontheweb.net/glossary_of_research_methodology_terms.pdfIn PDF document text
    • https://pupaxutakigi.weebly.com/uploads/1/3/4/5/134579126/e3d0f652.pdfIn PDF document text
    • https://laropavo.weebly.com/uploads/1/3/4/5/134585926/setifikak.pdfIn PDF document text
    • https://redelonoxoti.weebly.com/uploads/1/3/1/6/131606094/62ef0a9c08f239.pdfIn PDF document text
    • https://ruvatekokero.weebly.com/uploads/1/3/1/4/131437102/gikoruxolemibafonizo.pdfIn PDF document text
    • http://nafarami.medianewsonline.com/unqualified_steven_furtick_book.pdfIn PDF document text
    • https://kesuvovim.weebly.com/uploads/1/3/5/3/135317554/4210780.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://s3.amazonaws.com/lixasifasi/employee_loan_agreement_and_promissory_note_template.pdfIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/bumblebee_transformer_drawing_cartoon.pdfIn PDF document text
    • https://s3.amazonaws.com/dumupa/34941268138.pdfIn PDF document text
    • https://s3.amazonaws.com/vutame/xowevoxuluvuk.pdfIn PDF document text
    • https://s3.amazonaws.com/voropa/festivals_around_the_world_worksheets_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e5a21f4-4d5a-4133-80e5-4ae988f0f880/17808535369.pdfIn PDF document text
    • https://s3.amazonaws.com/gulapore/kadonixisemusolororisama.pdfIn PDF document text
    • https://s3.amazonaws.com/fadupazageraf/zogadipopox.pdfIn PDF document text
    • https://s3.amazonaws.com/zosevid/tedawovujoxubutoraka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c273484-07a6-4fd7-a67f-3f87a711efdb/evaluna_montaner_y_camilo_ya_se_casaron.pdfIn PDF document text
    • https://s3.amazonaws.com/jowutoneranemuk/sogidefobiborebekada.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_off0000ff12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF12 5036 bytes
SHA-256: 8890706d385cbec4f6385214cbffb7302314764caf91ced5a253823311392b5b
font_01_sfnt_off00011017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11017 11660 bytes
SHA-256: 5aa3cf7f524970c34934bd8b4b842f8a1704824deb2210768b63f6f3877d5c5b
font_02_sfnt_off0001359d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1359D 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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