Malicious PDF — malware analysis report

Static analysis result for SHA-256 c92dbb4236b49444…

MALICIOUS

PDF

76.4 KB Created: 2021-06-05 07:41:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 2c1e3ca7a8acdd2b514a4ec27b07e657 SHA-1: 486c9ca4a88e1769dd130fb2fb6fd50562d4f84b SHA-256: c92dbb4236b49444f854f200e6ce104f0eb82a9ba4ead38fd65e1fc5b26aa0ef
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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://oniceh.ru/pbw?utm_term=style+photoshop+free+download PDF link annotation
    • https://fudanologakobur.weebly.com/uploads/1/3/5/3/135394175/nitug.pdfIn PDF document text
    • https://givozerav.weebly.com/uploads/1/3/2/7/132710596/vuterifanomaxi_lawixatokidazu_luviresujuvek_fuxuxezipa.pdfIn PDF document text
    • https://tutonaxubetu.weebly.com/uploads/1/3/5/2/135296536/ba6824976cf.pdfIn PDF document text
    • https://gofizunesiwez.weebly.com/uploads/1/3/0/8/130874053/pukosexibaw.pdfIn PDF document text
    • https://zerurejapom.weebly.com/uploads/1/3/5/9/135964845/3965769.pdfIn PDF document text
    • https://tonukujile.weebly.com/uploads/1/3/1/8/131857071/vebawuwabexid.pdfIn PDF document text
    • https://gedenotovet.weebly.com/uploads/1/3/1/3/131379555/399427f37ee.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zosajivapesi.pbworks.com/w/file/fetch/144644193/what_are_the_chinese_zodiac_signs_and_dates.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10982bd8-7b36-45ea-a4fa-ad3142d837c7/guvixe.pdfIn PDF document text
    • http://pinurakus.pbworks.com/f/what_is_kirkland_jelly_belly.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d55bed4c-bba8-4495-bcd1-8d375622f79b/positive_psychology_study_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fce297e2-b10c-43f5-a3d7-5d2b7da1bc54/sezif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c990b07d-8e1c-40ea-93dd-550bd55a1c5e/como_saber_si_un_imei_esta_reportado_en_ecuador.pdfIn PDF document text
    • http://jilawuxifi.pbworks.com/f/2019_can_am_defender_max_xt_hd10_specs.pdfIn PDF document text
    • http://fagimox.pbworks.com/w/file/fetch/144520824/49422400727.pdfIn PDF document text
    • http://labidan.pbworks.com/f/kiforuv.pdfIn PDF document text
    • http://xuwuziz.pbworks.com/w/file/fetch/144591711/aws_lambda_download_file_and_upload_to_s3.pdfIn PDF document text
    • http://mifimoruzuwo.pbworks.com/w/file/fetch/144431463/1999_ford_ranger_xlt_4x4_4.0_towing_capacity.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_off0000ebe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE3 5428 bytes
SHA-256: cefcc920c2d80bd9f12f4b789fc108db2cb9c17c9adbfaa0191dd2be16c7da4b
font_01_sfnt_off0000fe6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6B 11028 bytes
SHA-256: ed9097b7c41e434a9fb2493995717c196dc14eb6480bde64048c80f9e7e5e9fb

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