Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8d834811ec0241c…

MALICIOUS

PDF

72.6 KB Created: 2021-02-27 16:11:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 3c2bf68a902d87365b26d140049ff5d7 SHA-1: 2aa918fed999f59261fa2713eb640ea9d0feec27 SHA-256: f8d834811ec0241c3d8efb8e22d8eb53e2809e94af824881f4975b4877df0589
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, including a link farm and an SEO redirector, indicating a strong intent to direct users to malicious or deceptive websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with common phishing lures.

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://bologen.ru/strik?utm_term=thank+you+ma%2527am+characters+roger PDF link annotation
    • https://rubosesizip.weebly.com/uploads/1/3/4/7/134744628/4621961.pdfIn PDF document text
    • http://getyourscore.info/devojewonatoruwalosaqhsjb.pdfIn PDF document text
    • https://lupibifexedesez.weebly.com/uploads/1/3/5/3/135319255/wofuxowuviliji.pdfIn PDF document text
    • http://lnstagramsupportingcenter.com/minions_2015_full_movie_300mbteki0.pdfIn PDF document text
    • http://legendbilisim.com/234403438135ybie.pdfIn PDF document text
    • http://gosoxegekiri.mywebcommunity.org/zamazolil.pdfIn PDF document text
    • http://sevagawos.getenjoyment.net/90361197504.pdfIn PDF document text
    • https://nezivubu.weebly.com/uploads/1/3/1/3/131384481/jewelukexupoxo_tivuwusim_vejupom_zetine.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/gasodamuza/roxudidetenolezakuf.pdfIn PDF document text
    • https://s3.amazonaws.com/nijudow/66931175527.pdfIn PDF document text
    • https://s3.amazonaws.com/jeponowon/77239444451.pdfIn PDF document text
    • https://s3.amazonaws.com/mudurixo/bufepapunusujolimigemofu.pdfIn PDF document text
    • https://s3.amazonaws.com/tobovunoberiki/scribus_official_manual.pdfIn PDF document text
    • http://petojijoxura.onlinewebshop.net/fundamentals_of_physics_5th_edition_download.pdfIn PDF document text
    • http://tefokubekaxo.rf.gd/avolites_titan_1_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/jigezilor/gelevumitozisu.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_off0000debe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBE 5332 bytes
SHA-256: d924d3d0618fd48e7bad80185f2ed31ffe643d00275bd67085cc6c2186ff1322
font_01_sfnt_off0000f0c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C6 10736 bytes
SHA-256: 5f42878a16ad3673f8e0d73b8a0b80d8a9daf2fadf3302e76ce14810a05db930

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