Malicious PDF — malware analysis report

Static analysis result for SHA-256 a516a5af77a323c7…

MALICIOUS

PDF

78.1 KB Created: 2021-05-26 23:46:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 8d070a3bac81bbb4ae107a800def13ec SHA-1: 45bb266c490ea909fbf1826162f997b127f8d8e4 SHA-256: a516a5af77a323c7196c5e8b63f42a6115f250a1680fe245e3a0bd58eccd920a
244 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable hosting and redirectors, indicating a link farm designed to manipulate search results or lead users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

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
  • 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=ibrahim+tatlises+mp3+indir+usta In PDF document text
    • https://cdn-cms.f-static.net/uploads/4500668/normal_600e5288f1ac7.pdfIn PDF document text
    • https://vakejijumusefuv.weebly.com/uploads/1/3/5/3/135313512/pagopazakufakilimudo.pdfIn PDF document text
    • https://zefipoxiba.weebly.com/uploads/1/3/2/6/132681281/234c224cfc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471995/normal_5fcb0d751f5a3.pdfIn PDF document text
    • https://fezuwarojeti.weebly.com/uploads/1/3/1/3/131383544/zatizanuzovevibim.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415334/normal_5fee38cf5531d.pdfIn PDF document text
    • https://ninobajoxakatud.weebly.com/uploads/1/3/4/7/134702009/3986653.pdfIn PDF document text
    • https://bixedonaxube.weebly.com/uploads/1/3/4/6/134619794/109082.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474211/normal_603f1ca04fee4.pdfIn PDF document text
    • https://vuvudarekiw.weebly.com/uploads/1/3/4/0/134017261/9614604.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495860/normal_601802c6254c3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379491/normal_5fe2b29ed5ae1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/01bbec8f-6795-4143-9444-456843001161/how_to_import_files_into_goodnotes_5.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e830e3b8-77f2-4485-801a-5f76f93724c5/92935704861.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b540f2e-d6d9-41cd-a673-65bb9d02d8aa/dujuxoke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a408b0b-1941-4ef5-9ba4-b2a63bef3946/christianity_beliefs_and_practices_quotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d544926-c2d0-4a3f-95c9-ba1fc2c81b55/kifujudeje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/111e48d1-b62e-4d9d-b75d-6f05d53f62b7/comentario_bblico_adventista_tomo_4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fc46cee-ef5f-4a37-adb4-a698e26923b6/57203377420.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/498db741-b654-464d-9f17-56d85a42e9ec/jazz_toni_morrison_characters.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/558f68b0-1f0a-4776-a837-da994c56c855/shree_datta_bavani_marathi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91a18760-1f36-48f5-8031-45827e628952/26234600441.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_off0000f1ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BA 5440 bytes
SHA-256: 65565925e2e6712e02fef83e0c4c999d69978182d58d520d148e2837ef2688fc
font_01_sfnt_off00010403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10403 11484 bytes
SHA-256: 0328384c3c91cb88d415a7b8eeb7c9a73e916735ae86ccf1b4a6eb0c9b3e6d2e