Malicious PDF — malware analysis report

Static analysis result for SHA-256 24dec917b141cda7…

MALICIOUS

PDF

82.4 KB Created: 2021-04-02 20:29:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 68b04f4d668d23a57ed41eb2bf251916 SHA-1: 9778f183ffb6b368b06a21076fa8a9a131d1f710 SHA-256: 24dec917b141cda7c4568d349f2f9586b5bd06e62dc7c700792e5374f2c57711
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are hosted on dynamic DNS services or free hosting platforms, suggesting a link farm or phishing operation. The primary malicious URL identified is 'https://xezojetit.ru/strik?utm_term=knot+tying+instructions+pdf', which is likely used to deliver a secondary payload or redirect to a phishing page. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/strik?utm_term=knot+tying+instructions+pdf
    • https://cdn-cms.f-static.net/uploads/4385620/normal_604a7c90b561b.pdf
    • https://faturigazed.weebly.com/uploads/1/3/4/8/134859690/purebamedutidezem.pdf
    • http://lukunezevowazol.sportsontheweb.net/74264699219.pdf
    • https://makifilibavik.weebly.com/uploads/1/3/5/3/135383918/aa6fa.pdf
    • https://vipuwajaziw.weebly.com/uploads/1/3/5/3/135398090/pifota.pdf
    • https://rijomedoniki.weebly.com/uploads/1/3/5/3/135399424/wojamedikuwefures.pdf
    • https://jabibodusap.weebly.com/uploads/1/3/2/6/132681053/2471916.pdf
    • https://xasukibumit.weebly.com/uploads/1/3/4/7/134749231/17f7c.pdf
    • https://static.s123-cdn-static.com/uploads/4481552/normal_5ff151a1c9f66.pdf
    • http://setopin.mypressonline.com/bhagavad_gita_in_telugu_online.pdf
    • https://direfuxapiw.weebly.com/uploads/1/3/4/3/134371974/topexefamowunitazuxa.pdf
    • http://pitupunum.iblogger.org/jopamuvosepokesavu.pdf
    • http://wipunemobak.mygamesonline.org/gepiverogubobadexike.pdf
    • https://miroguwitofenev.weebly.com/uploads/1/3/5/9/135958286/386276.pdf
    • https://static.s123-cdn-static.com/uploads/4459175/normal_60087900311f0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/9f65732a-1a9e-4e8c-a77b-6dcd7f5b607b/my_side_of_the_mountain_movies.pdf
    • http://depewogidi.rf.gd/wordpress_login_redirect_not_working.pdf
    • https://uploads.strikinglycdn.com/files/46ca15ef-77f7-4d5e-8f3c-715c79e4194a/merozekepokepuzokog.pdf
    • http://rezopaduj.epizy.com/difference_between_budgeting_and_forecasting.pdf
    • http://bofujenarabi.rf.gd/30153065348.pdf
    • https://uploads.strikinglycdn.com/files/ee14cfd2-2e00-4de8-992f-5e03b6d34f62/86467139377.pdf
    • http://nifibomagogov.rf.gd/abinaya_mugen_rao_audio_song.pdf
    • https://uploads.strikinglycdn.com/files/7abb33eb-6443-4889-a02e-e2a5309bbc46/boston_market_thanksgiving_menu_catering.pdf
    • http://mifojizu.myartsonline.com/xivaxudexaguvadikigisi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001064a.bin
784f8f58c17a280829861dfc42dd6807e14836b81cfeac125c63431c27c461e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1064A 5152 bytes
font_01_sfnt_off00011801.bin
63250d9b0bb1f7f9da8ca1c023e00683e3f598eeba6b76c41556e02a898c66e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11801 10512 bytes

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