Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae3a79081e64f2d6…

MALICIOUS

PDF

85.6 KB Created: 2021-04-25 09:44:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: cfa5cbe172bf3f4a047f1b835e3020b8 SHA-1: c94a2ccd1fa28d04a5886f81eaa64025a3352c82 SHA-256: ae3a79081e64f2d6648220ef11f3a1ff55225b06e1432a6893529529405bca56
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 pointing to disposable hosting or known malicious redirectors, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the embedded links and the PDF structure itself are indicative of malicious activity, likely aiming to redirect users to harmful sites.

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://dafemum.ru/strik?utm_term=what+is+included+in+herbalife+preferred+member+pack In PDF document text
    • https://cdn.sqhk.co/tajudozizif/gjhi0qR/counter_terrorist_agency_free_download_android.pdfIn PDF document text
    • https://cdn.sqhk.co/dabozijide/ieYhdM8/amazon_seller_central_customer_service_number.pdfIn PDF document text
    • http://streamsweets.com/what_is_5x5_training_good_for88ixk.pdfIn PDF document text
    • https://cdn.sqhk.co/gowalitusiwa/jeYgihh/91778042242.pdfIn PDF document text
    • https://cdn.sqhk.co/marixefe/dGRjacX/guxusurotolafozirupejit.pdfIn PDF document text
    • http://yblda.fun/mawexan5245d.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwusemob/CtgeAkE/xujugu.pdfIn PDF document text
    • https://cdn.sqhk.co/kejofuvata/1gdJ4ha/wuzozoxuwapaj.pdfIn PDF document text
    • https://cdn.sqhk.co/gimexigerub/RiajeD3/ruvemonula.pdfIn PDF document text
    • https://cdn.sqhk.co/zonurubo/63geuXa/visotafusuribivokoselir.pdfIn PDF document text
    • http://13millions.store/13841774739t4xja.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kazaxeso.rf.gd/gasuwo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1506218-98ed-4a2d-b8b9-ee19a303749c/le_petit_prince_french.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9ba8704-6393-48fb-b262-f3683f622ca6/bissell_pet_hair_eraser_vacuum_troubleshooting.pdfIn PDF document text
    • http://punumakiwibase.rf.gd/89365454509.pdfIn PDF document text
    • https://8be317c1-93d6-4444-9a1c-030c84ae583f.filesusr.com/ugd/709942_ae8c3c45e10543f7b729fd742f7d4765.pdf?index=trueIn PDF document text
    • https://cb38ef3f-1f2c-4622-8962-dca261660167.filesusr.com/ugd/3ae201_71b76fdebc4a45a7b77d331eea8b4b1b.pdf?index=trueIn PDF document text
    • https://0fdd9f25-8366-4660-9463-376fd915ad39.filesusr.com/ugd/c16cf9_51b2065a0c064347a4428b94430bf01d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/23f26d1e-ad2e-4df1-9cc3-ecdbeb9415d4/zowalivumazafumov.pdfIn PDF document text
    • https://4f65703b-d4c0-4c9c-9e30-73c8cc83ec5d.filesusr.com/ugd/54fa57_3e300b6316574b388fa7e8827166c4b1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1ddcd7b-30dd-4518-a6ec-90095c273d52/47971301594.pdfIn PDF document text
    • https://04a9e765-cf69-4035-9b9a-998d8fb4e692.filesusr.com/ugd/8c5016_219294fca69540a78894bc0541807b6a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b98d7c6-1e7e-42fb-bd75-77096a267bfc/ameritron_al-811_manual.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_off00010be7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE7 5612 bytes
SHA-256: 293fd78e14a664ec930a3a371dd1839d1e25dd2cecfa23376425de456906b093
font_01_sfnt_off00011ed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED3 11756 bytes
SHA-256: d17596cf0d07d1a9a03eab0345ed5102a2bb808295915c1853670a592fe8c863

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