Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3e4c83441186ff2…

MALICIOUS

PDF

95.8 KB Created: 2021-04-09 05:50:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 756bc6ea796badb35f6e39ba684b20f0 SHA-1: 205f42b3efe7150fa0a9231a179bfa28a4b1c49d SHA-256: b3e4c83441186ff252d7438301b4b222aad6d99336e325e8d81652890fe87dfa
244 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to disposable hosting or redirectors, indicating a link farm designed to distribute malicious content or phish users. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags a link to 'https://yafferge.ru/strik', suggesting a phishing or malware delivery attempt. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=what+is+acceptance+and+commitment+therapy+training In PDF document text
    • https://muragifenujokuf.weebly.com/uploads/1/3/1/1/131164382/kedabekuvarika_xezizizinito.pdfIn PDF document text
    • http://wozovumorawoka.sportsontheweb.net/antes_de_partir_libro_completo.pdfIn PDF document text
    • https://zutiwemozebej.weebly.com/uploads/1/3/2/7/132712207/c9053a6dc30.pdfIn PDF document text
    • https://suzixibaru.weebly.com/uploads/1/3/4/7/134709676/gewizin_zajanotagim_wifozenus_dokavoseveput.pdfIn PDF document text
    • http://xijogeziku.66ghz.com/24960769875.pdfIn PDF document text
    • http://jexekiraj.sportsontheweb.net/1159033598.pdfIn PDF document text
    • http://revilokepudidu.mygamesonline.org/fundamentals_of_molecular_spectroscopy_banwell.pdfIn PDF document text
    • http://jodesomuxuduzu.22web.org/financial_accounting_theory.pdfIn PDF document text
    • http://satejenojosi.iblogger.org/malayalam_love_whatsapp_status_video_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://pubamawuxa.epizy.com/cheran_pandiyan_movie_song_starmusiq.pdfIn PDF document text
    • https://68e1e3d4-268d-49bc-a8aa-b119cb10fea7.filesusr.com/ugd/3ceeb9_db1e05ecd9a243638a3d25fd2335345a.pdf?index=trueIn PDF document text
    • http://luwulifinuneti.epizy.com/breaker_box_diagram_template.pdfIn PDF document text
    • https://e86c6366-0652-46cb-9e1f-5633a133dba9.filesusr.com/ugd/510a18_2ce81bd8bc1c4a3c932fc6476840428a.pdf?index=trueIn PDF document text
    • https://eaa62ee9-779c-4a2d-9f50-6c66b019a99c.filesusr.com/ugd/1cc777_212711b68223421a86310d8a90eca23d.pdf?index=trueIn PDF document text
    • https://46c19374-600d-43be-a5f2-d8bf07c6fddf.filesusr.com/ugd/cc94a4_0a1441d4d4964bc484825f8ec4911e78.pdf?index=trueIn PDF document text
    • http://binalidagu.epizy.com/xuzozoso.pdfIn PDF document text
    • http://radizala.epizy.com/verbos_regulares_en_ingles_pasado_presente_y_futuro_en_espaol.pdfIn PDF document text
    • https://6ddb26ad-aa8e-4a3e-a925-5cef6fc035e1.filesusr.com/ugd/d3d820_ecf798e61725464cb7ec4be904e814e9.pdf?index=trueIn PDF document text
    • https://bd04a250-715b-4db0-8087-55ec2f714cf5.filesusr.com/ugd/0c2191_72b10846f79641f897cdd757c6bd4937.pdf?index=trueIn PDF document text
    • https://3d7c42e8-cad9-4196-8f3c-0f210fd97588.filesusr.com/ugd/1b7c00_5e8ecd7db8394689b342ef08706431f0.pdf?index=trueIn PDF document text
    • https://8f20b4bd-83f7-4a55-8c6f-e9501e2e061c.filesusr.com/ugd/c1c462_0f1ed4e174414dd18d6da61c2b30f6f4.pdf?index=trueIn PDF document text
    • https://e18e6c05-101e-4f41-9c4d-f518aea09dbb.filesusr.com/ugd/7972b3_d6c7ce689193409a8a2cf5007aa4491b.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12971 5360 bytes
SHA-256: f1cf76d2b9b47c277c0bc61753508289a7e65e3acae547f6e09966c709a0bf02
font_01_sfnt_off00013b7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B7E 12080 bytes
SHA-256: de615b53fbe0bf6eba1c395052715ec8da7938e1fb8889453faaa5c3fe038c6e
font_02_sfnt_off00016336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16336 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71