Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff1862783976bad7…

MALICIOUS

PDF

115.3 KB Created: 2021-01-04 01:00:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 1c49b0f3f7b6d987b4111ef043698f5d SHA-1: 2f697cebd006d575f6787894f342a450f7182131 SHA-256: ff1862783976bad725c5701e7fc016685ae6c7ab6e207410e7626ff29f8eba33
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffking.ru/wb?keyword=japanese%20alphabet%20in%20english%20letters PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4420019/normal_5fe5fb8b64606.pdfIn PDF document text
    • https://xumizobizuzu.weebly.com/uploads/1/3/4/6/134688834/1132919.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374013/normal_5fdd765202cc5.pdfIn PDF document text
    • https://koxalisibigemig.weebly.com/uploads/1/3/4/8/134854932/3ebff0.pdfIn PDF document text
    • https://fogunovavak.weebly.com/uploads/1/3/2/6/132681822/985b8f1607e70.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375197/normal_5f9dd988a7e2a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488569/normal_5fdc366a1a82d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451945/normal_5fd64cd2a6dc9.pdfIn PDF document text
    • https://zavomafig.weebly.com/uploads/1/3/4/3/134356936/difejigapu_meter_nusuware.pdfIn PDF document text
    • https://dikanutedageke.weebly.com/uploads/1/3/4/4/134457663/30bb25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420617/normal_5f9ce42c7d372.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409095/normal_5fe82deaf3535.pdfIn PDF document text
    • https://zinikedefi.weebly.com/uploads/1/3/0/7/130740178/3408408.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367947/normal_5fefa6a70f3c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366633/normal_5f87453418d47.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/51ff0c1a-0350-471c-b990-3740c2eec675/kingsley_loop_walk.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013b6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B6C 16060 bytes
SHA-256: 5627a3ce808303977c50d140c6b027adefae66a859bab20e3d73a53facf3d6b9
font_01_sfnt_off00016f3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F3C 5212 bytes
SHA-256: 68e9f055b7c28cf7d19bfab9036bb4ce0a0de8a132b25be01ec2f74928e11563
font_02_sfnt_off000180e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x180E3 12380 bytes
SHA-256: 1922d3b6a1aa8a172037f87ae8bf4bce8bab305bd85e43377d87dac7bbc935a2
font_03_sfnt_off0001a9ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A9FF 16204 bytes
SHA-256: 5fb32d4069248257ceca581c4280c58dce305645e06328f8fc1285295b25536c