Malicious PDF — malware analysis report

Static analysis result for SHA-256 96d3d1c1fa3c35c4…

MALICIOUS

PDF

87.7 KB Created: 2021-02-15 15:22:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 64796c560d028a52264e7d54aac028fe SHA-1: e30278ffb650cac62e51620d5e6cce14e05af4cf SHA-256: 96d3d1c1fa3c35c425bf87050b24ec97df93b821874a7972fd1284ea145bfa6a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/strik?utm_term=american+megatrends+bios+v02.61+boot+from+usb PDF link annotation
    • http://rugozuravonabib.22web.org/7484198114.pdfIn PDF document text
    • https://konovupifa.weebly.com/uploads/1/3/0/7/130775136/6755548.pdfIn PDF document text
    • https://gobunelesivuwol.weebly.com/uploads/1/3/2/3/132303092/debapufogiwajel_geketamimopo_wobowexitijupez.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403952/normal_5fdfa87238ef1.pdfIn PDF document text
    • http://wobixoka.66ghz.com/meaning_poor_academic_performance.pdfIn PDF document text
    • https://cdn.sqhk.co/zufuxirap/gjohehn/80285569003.pdfIn PDF document text
    • https://bavanakeburosot.weebly.com/uploads/1/3/5/3/135302165/105383.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kagilabitivibe.epizy.com/19528565157.pdfIn PDF document text
    • http://rewezaxow.epizy.com/75387474239.pdfIn PDF document text
    • http://jinujatafariva.rf.gd/calle_y_poche_libro.pdfIn PDF document text
    • http://pujekejiwevote.epizy.com/afm_microscopy.pdfIn PDF document text
    • http://vegunag.rf.gd/86451916920.pdfIn PDF document text
    • http://derizarage.epizy.com/course_outline_template.pdfIn PDF document text
    • http://guligakifiw.epizy.com/beamng_drive_car_jump_arena.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000112df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112DF 6008 bytes
SHA-256: 8ad0c93b74d2553b13f04ca600750e400f2129a07d8a62e5912a900772f6535a
font_01_sfnt_off0001274e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1274E 12448 bytes
SHA-256: 763102ca9b3ee79dfcfb5acfd642868ed69fbe8f81ace243b2cbac90b34be5b1

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