Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab6770cd2dcdfb41…

MALICIOUS

PDF

86.0 KB Created: 2021-05-29 18:10:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f155fdf4cad892f5d512a9b6233916d SHA-1: d95e640bf342868a3bdd58aa4de332941f1f9d13 SHA-256: ab6770cd2dcdfb41aea44bd1df06d6edaea0c2a411b4a76eb887b8a2daee419b
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to PDF files hosted on various platforms, suggesting a link farm or phishing operation. The primary URL, https://jacksth.ru/strik, is likely used to redirect users to malicious content or further phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/strik?utm_term=rider+waite+tarot+reading+online
    • https://static.s123-cdn-static.com/uploads/4367303/normal_600363fe5bc33.pdf
    • https://tiseparalav.weebly.com/uploads/1/3/4/7/134735838/mokobewixo.pdf
    • https://kuratiwupojaxu.weebly.com/uploads/1/3/4/0/134017491/digekiwun.pdf
    • https://static.s123-cdn-static.com/uploads/4459796/normal_5fe5302b2c5f0.pdf
    • https://cdn-cms.f-static.net/uploads/4502268/normal_5fd8e7c588027.pdf
    • https://fudisilutopunus.weebly.com/uploads/1/3/1/4/131438012/zifagonolekesa.pdf
    • https://fusesekomufe.weebly.com/uploads/1/3/1/6/131606177/kapaxebuw_fusijinuwun.pdf
    • https://bosogafowobalo.weebly.com/uploads/1/3/4/6/134614472/4404113.pdf
    • https://jetasiduneka.weebly.com/uploads/1/3/4/5/134586997/masedufegukapux-lexegupoxuj-rexovaxad.pdf
    • https://tetejinuditobig.weebly.com/uploads/1/3/5/9/135973847/2743105.pdf
    • https://vadopesi.weebly.com/uploads/1/3/0/7/130738994/4ec0bc69a3cd.pdf
    • https://cdn-cms.f-static.net/uploads/4368978/normal_60474cf71b119.pdf
    • https://faneboluti.weebly.com/uploads/1/3/4/4/134464249/6798809.pdf
    • https://cdn-cms.f-static.net/uploads/4417025/normal_601ce36991be9.pdf
    • https://cdn-cms.f-static.net/uploads/4379369/normal_605133b949c68.pdf
    • https://mepovokure.weebly.com/uploads/1/3/0/9/130969824/dukokelumopiwu.pdf
    • https://static.s123-cdn-static.com/uploads/4453333/normal_5fcd9dc12ae74.pdf
    • https://cdn-cms.f-static.net/uploads/4453102/normal_603eefeeed61c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/2d60f39a-0e50-47b6-b78d-1854603cebe5/cuanto_equivale_100_m_en_pies.pdf
    • https://uploads.strikinglycdn.com/files/c72f64da-7973-454e-b725-e6e97a83672b/56902997711.pdf
    • https://uploads.strikinglycdn.com/files/53b56987-f76f-4f42-8fe5-0a58a7f80813/26109004516.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000101d6.bin
b1ad29c896b6b64cfd792472d5add39956c9cc73e058d9faf29f445c0f7c0458
pdf-font-stream PDF embedded font (sfnt) at offset 0x101D6 4704 bytes
font_01_sfnt_off000111ec.bin
b952be24796389a01e1337650cfc541c2962de8ae5466e74507eb9fc24728a4b
pdf-font-stream PDF embedded font (sfnt) at offset 0x111EC 12620 bytes
font_02_sfnt_off00013c9c.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C9C 4324 bytes