Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccea22161fcbffad…

MALICIOUS

PDF

75.5 KB Created: 2021-05-27 23:48:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 8aaee3a365b7629302d264dd9f0837ac SHA-1: 75e1064e34326f3789eb9721851940cba6ab7411 SHA-256: ccea22161fcbffad0d3aed57791ae289773573140b7d54495934ff5980c2e751
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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://nipisod.ru/123?utm_term=manualidades+navide%25C3%25B1as+con+papel+iris PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4408461/normal_600105e275b22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475728/normal_6014e3b691259.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463809/normal_60028c776da0f.pdfIn PDF document text
    • https://xigowobil.weebly.com/uploads/1/3/4/6/134645495/zifadomuwif.pdfIn PDF document text
    • https://limakeluror.weebly.com/uploads/1/3/4/6/134657352/bbed16b22729c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418175/normal_605703eb1ce1f.pdfIn PDF document text
    • https://pimedoxeniku.weebly.com/uploads/1/3/4/6/134640330/780886b5590d3eb.pdfIn PDF document text
    • https://worozimovazez.weebly.com/uploads/1/3/1/4/131406108/dddec830b856f93.pdfIn PDF document text
    • https://jozokuxig.weebly.com/uploads/1/3/2/8/132814463/5507784.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456377/normal_6059ec8a17312.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405930/normal_604d1c1f37190.pdfIn PDF document text
    • https://daxugukixirujin.weebly.com/uploads/1/3/4/7/134739014/9385aa87.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408485/normal_60214afdcf752.pdfIn PDF document text
    • https://xolesozetenosox.weebly.com/uploads/1/3/1/0/131070434/4176526.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505363/normal_5fd9188fc7e96.pdfIn PDF document text
    • https://setixifofu.weebly.com/uploads/1/3/1/6/131606861/kamolavegamopar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499283/normal_6020b372e3d0d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485710/normal_6056868ad40d0.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/3d9fd0ad-f169-4288-9480-b6ba8777eb5f/rizewixezoveto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cb7c3bb-fa6e-47a7-b18a-9974b83629f2/how_to_stop_being_sad_all_the_time_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38dfbf27-f40a-431d-a91c-20c95db204c2/74049256267.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89bb96f9-c1db-4e5d-b1e9-d5f919cd63fe/black_boy_haircuts_long_hair.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_off0000e8ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FF 5344 bytes
SHA-256: 760a7453a1f85a2aeefe0d0d22052764cf2d0aa90dabd26e17d20c8842c12e8d
font_01_sfnt_off0000fb0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0B 10892 bytes
SHA-256: 505fcba9039f1251b985303aa0c19b032b5a70b10e9586c218212b7be3d4e6e7