Malicious PDF — malware analysis report

Static analysis result for SHA-256 01ecb2477bb1c52f…

MALICIOUS

PDF

82.0 KB Created: 2021-04-18 17:02:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: dacbfb4b8b916f41de4c864fd4f2c326 SHA-1: 42971ea8e3e832218b70b8a508d8f380062e0534 SHA-256: 01ecb2477bb1c52f4acdd75fcc1151ca0853cf7af1ad3fd2cda8fb5c10130097
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.
  • 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.
  • 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://zajinet.ru/strik?utm_term=american+and+british+english+words+list+a+to+z+pdf PDF link annotation
    • https://bodijoso.weebly.com/uploads/1/3/1/3/131380183/527fb7024c6aa33.pdfIn PDF document text
    • https://xuwirebusupedun.weebly.com/uploads/1/3/4/3/134379604/4d8e88e9498f70.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390056/normal_603eae5d68975.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369330/normal_606b4e860646f.pdfIn PDF document text
    • https://piwaxokireruber.weebly.com/uploads/1/3/0/9/130969414/4d87a81acfca63.pdfIn PDF document text
    • https://gefipozaxafuni.weebly.com/uploads/1/3/5/3/135312829/ce80e8ff4a.pdfIn PDF document text
    • https://zemilogafolot.weebly.com/uploads/1/3/4/0/134096074/daroxaboxeziro.pdfIn PDF document text
    • https://wapaberupuz.weebly.com/uploads/1/3/5/3/135397773/2034763.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4527859/normal_5ffa4eb02fbe7.pdfIn PDF document text
    • https://mofomajem.weebly.com/uploads/1/3/4/3/134349017/kegawoxel_ladutoloti_bogalarose.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480745/normal_605c4ac089bf9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383131/normal_60669abfe40c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368742/normal_606bc17f80668.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387590/normal_603f024ba5523.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490132/normal_60609e8124460.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392877/normal_601ac47c7bff4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494139/normal_5ff08284ab7fc.pdfIn PDF document text
    • https://pisefipekopaz.weebly.com/uploads/1/3/4/4/134461515/sizaseru-jisifobimekotus-bisuletivikego-pagofas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409607/normal_6045c372b93c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503279/normal_600fc42ecc826.pdfIn PDF document text
    • https://sabiwivilo.weebly.com/uploads/1/3/4/3/134316676/0bbbc9c.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/lanorolowu/20528393936.pdfIn PDF document text
    • https://s3.amazonaws.com/wukara/966884914.pdfIn PDF document text
    • https://s3.amazonaws.com/zewimu/the_wolf_among_us_adreno_full_apk.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_off000101a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A9 5840 bytes
SHA-256: d1cfe020303e718f2b5889d56a8ee48b9fdfb77886db27b2ec4071bdf0362fb3
font_01_sfnt_off00011575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11575 10700 bytes
SHA-256: df69b191ae13d6a8dc2f5a7265ab711ba48fe88c1ceb5107b6941259ecd8d7ab