Malicious PDF — malware analysis report

Static analysis result for SHA-256 5164bef5e7032f95…

MALICIOUS

PDF

73.0 KB Created: 2021-04-04 11:01:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c3166d976a8a95148397983920a395c9 SHA-1: c40ab87f47533b3853358ad464e78f0da3609d63 SHA-256: 5164bef5e7032f95f98a7866215cf390d80ff97ab14e31289d798ac0f060c41d
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The embedded content, though heavily obfuscated, likely serves to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://lozipotod.ru/award?keyword=uptet+syllabus+2020+pdf+sarkari+result PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4462344/normal_5fe983fc173a4.pdfIn PDF document text
    • https://dudunetexuzo.weebly.com/uploads/1/3/1/3/131379759/kekojewi.pdfIn PDF document text
    • https://sawolopu.weebly.com/uploads/1/3/6/0/136049845/bemufowemimezu_lonazemepefon_zilelir_wevomozowelu.pdfIn PDF document text
    • https://dezazobe.weebly.com/uploads/1/3/4/7/134755526/1966d1be01.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381735/normal_5fcd885dd8a5e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471683/normal_5fd1831c3ff29.pdfIn PDF document text
    • https://fupomojokom.weebly.com/uploads/1/3/4/4/134458651/fesilezijaju-foroju.pdfIn PDF document text
    • https://latowinu.weebly.com/uploads/1/3/4/5/134508675/7f89f76.pdfIn PDF document text
    • https://gixatupugibezi.weebly.com/uploads/1/3/5/2/135296842/1274817.pdfIn PDF document text
    • https://lomameleni.weebly.com/uploads/1/3/4/5/134597964/b04b94210583.pdfIn PDF document text
    • https://funebaxap.weebly.com/uploads/1/3/4/3/134399245/rozixuzifezifib-fizetubim-maloriwo.pdfIn PDF document text
    • https://kazajibabagak.weebly.com/uploads/1/3/4/4/134467412/kegolojew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372100/normal_604df19c6f776.pdfIn PDF document text
    • https://xetiwomojebiwif.weebly.com/uploads/1/3/4/7/134714835/4284f3f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381085/normal_6003f66ecbb44.pdfIn PDF document text
    • https://mitabepomumo.weebly.com/uploads/1/3/1/8/131872015/2008198.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3064a0a7-8496-4b95-be1e-56094aee372f.filesusr.com/ugd/0cf4b9_37d4bd115ef941fcbb8ec8f3236e6db3.pdf?index=trueIn PDF document text
    • https://8f1c0ae7-1ba6-4c51-a623-4d29f5e3aebb.filesusr.com/ugd/c1615c_683f62450d0b4084965dc24e2a886b23.pdf?index=trueIn PDF document text
    • https://55963656-6eb1-4b25-bcd5-bb835d65808b.filesusr.com/ugd/0064ae_794da51403244d6daef260651f954df6.pdf?index=trueIn 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_off0000dff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF2 5608 bytes
SHA-256: b0af5ecd50117b43bb25ab0dd92ae2aef7eeb66d611c5359b6fecec9843d7c67
font_01_sfnt_off0000f316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF316 10572 bytes
SHA-256: d23bbd9b6fa392c2a22e4a7a5ff5d1763ab4952739b0e71c572a0d1748e3ae28