Malicious PDF — malware analysis report

Static analysis result for SHA-256 5327759e232d71f0…

MALICIOUS

PDF

74.8 KB Created: 2021-03-19 06:17:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 0b03b39ea2399e357357a4f5648c43ff SHA-1: 96488c1307d467bee3070988887da56d8ebf779f SHA-256: 5327759e232d71f070b154e3ef947b2df5af9598031410304c8e3301b1e26884
196 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to SEO redirectors and link farms designed to funnel users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs and the structure of the PDF suggest it's part of a campaign to drive traffic to compromised or malicious domains.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://botokaw.ru/wix?keyword=upenn+class+of+2020+size PDF link annotation
    • https://juxibawazorar.weebly.com/uploads/1/3/3/9/133997202/tesumoxoj.pdfIn PDF document text
    • https://batapasupo.weebly.com/uploads/1/3/1/4/131482803/6708883.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471683/normal_6025950e2c023.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477615/normal_6008f11ea78e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449600/normal_5fd65c6e304c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449996/normal_601b2e3ebb96f.pdfIn PDF document text
    • https://cdn.sqhk.co/dukasavubu/b1ViOhg/get_in_shape_fast_workout.pdfIn PDF document text
    • https://cdn.sqhk.co/rabawula/gcjipWM/pac-_man_ghost_light_instructions.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472221/normal_6030dd6856f97.pdfIn PDF document text
    • https://wetugaremuzen.weebly.com/uploads/1/3/5/2/135298520/6215944.pdfIn PDF document text
    • https://xoverepidagagit.weebly.com/uploads/1/3/4/4/134469055/kitutofu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384825/normal_60444bb11136e.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/kewuxejikiwe/tejuneguxigopajuweno.pdfIn PDF document text
    • https://s3.amazonaws.com/sojenozap/lindsay_adler_posing_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/pipaneku/40585387666.pdfIn PDF document text
    • https://s3.amazonaws.com/xumakomowi/vuritufuw.pdfIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/azar_fundamentals_of_english_grammar-3rd-ed-workbook.pdf.pdfIn PDF document text
    • https://s3.amazonaws.com/rovuweraja/28497385328.pdfIn PDF document text
    • https://s3.amazonaws.com/pubopelej/65803515273.pdfIn PDF document text
    • https://s3.amazonaws.com/xafaxotaful/auto_clicker_guide.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_off0000e7a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A4 5228 bytes
SHA-256: bb8584c15b74f6d6d4c07397e868aee763acfc5a045c1c04ab0d619a404b0de9
font_01_sfnt_off0000f991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF991 10784 bytes
SHA-256: dd53273aa2920e7c7dd0f5d04c552d76c58a502923ad5b7f2c2d0c5aa33a6369