Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cce072259d2380e…

MALICIOUS

PDF

83.4 KB Created: 2021-04-24 08:15:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: d52da0a2e864a6dd4c7e54a671f3d397 SHA-1: 3a7c3257916464b4bc4aa3ebf710b6bc4e161eea SHA-256: 6cce072259d2380e3234f3b286137d0f418ba7b662d91078883d82f5286fafef
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to SEO-optimized pages designed to redirect users. The 'PDF_SEO_LINK_FARM' and 'PDF_SEO_UTM_REDIRECTOR_LINK' heuristics indicate a pattern of creating link farms and using redirectors, likely to distribute phishing content or malware. The ML classifier and ClamAV detection strongly suggest malicious intent, with the primary goal appearing to be directing users to malicious sites via deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://fokemale.ru/strik?utm_term=kurt+vonnegut+slaughterhouse+five+summary PDF link annotation
    • https://tipozuroboga.weebly.com/uploads/1/3/4/2/134265922/siremepoto.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406787/normal_602ad29b030aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423166/normal_600d981244905.pdfIn PDF document text
    • https://zokofefedepop.weebly.com/uploads/1/3/1/4/131437243/ralin-punixapilusig.pdfIn PDF document text
    • https://sezorataxij.weebly.com/uploads/1/3/4/6/134600708/6527979.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408713/normal_5fea237f31326.pdfIn PDF document text
    • https://dinamulu.weebly.com/uploads/1/3/1/6/131637284/jisilegemumogo_dupejemo_wozefuji.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381294/normal_60048a5dcc95f.pdfIn PDF document text
    • https://muxorapud.weebly.com/uploads/1/3/4/4/134455491/xawajaxifirijavife.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379485/normal_603b170a8bf3c.pdfIn PDF document text
    • https://xakalawuvobovu.weebly.com/uploads/1/3/1/0/131071286/748662.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470678/normal_606b1e9a05078.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403540/normal_6017b1f86e7d6.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/jevelel/unfamiliar_words_using_context_clues_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/bubeto/47371069737.pdfIn PDF document text
    • https://s3.amazonaws.com/kofabube/bioshock_mobile_android.pdfIn PDF document text
    • https://s3.amazonaws.com/fedufiporara/battery_doctor_app.pdfIn PDF document text
    • https://s3.amazonaws.com/jonora/whatsapp_pc_setup_softonic.pdfIn PDF document text
    • https://s3.amazonaws.com/jebokizez/vijoxevazifewez.pdfIn PDF document text
    • https://s3.amazonaws.com/papuja/vedegiraduvaxofixazir.pdfIn PDF document text
    • https://s3.amazonaws.com/geraromu/87581950493.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF469 5312 bytes
SHA-256: 816f4dcfca42915980b0db25a7418e454e527e36634df8de85cd87bf1f16100b
font_01_sfnt_off0001066b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066B 10496 bytes
SHA-256: 7fc3d991dd85343ff37760493764a495f0c2f7e74cebcb43c5699a3df9724fe2
font_02_sfnt_off00012a74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A74 16204 bytes
SHA-256: c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449