Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc2be608771075cd…

MALICIOUS

PDF

78.9 KB Created: 2021-06-14 06:07:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: b822d7b6e99c6bbfc182f774e1bcf4e3 SHA-1: 058889e6e4f5e743a5892c08677938875cd210dd SHA-256: fc2be608771075cd1b6a110210b17a16bc64d7b368db49aebbdb9fcfa32e6048
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 phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect the user to malicious content, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/123?utm_term=imperial+march+theme+sheet+music PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384323/normal_60691f1093bb3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392470/normal_601d70538d3c9.pdfIn PDF document text
    • https://kokozorakozuwel.weebly.com/uploads/1/3/0/7/130775651/2875772.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380701/normal_60c6722614787.pdfIn PDF document text
    • https://larigagip.weebly.com/uploads/1/3/4/8/134887586/babadux.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4528876/normal_5fc6cc6a3605e.pdfIn PDF document text
    • https://luwidejike.weebly.com/uploads/1/3/4/8/134881341/mexeriwumixabopejara.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491688/normal_604f833ea3fca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381551/normal_601bfbb2dec82.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tasonupopam.pbworks.com/w/file/fetch/144762297/gukosifa.pdfIn PDF document text
    • http://biwonuv.pbworks.com/w/file/fetch/145024410/minecraft_free_version_1.14.pdfIn PDF document text
    • http://zipiwume.pbworks.com/f/49069223518.pdfIn PDF document text
    • http://sodopateduke.pbworks.com/f/how_to_install_mahle_piston_rings.pdfIn PDF document text
    • http://tisowowuduwe.pbworks.com/w/file/fetch/145027257/ankhiyon_ke_jharokhon_mp3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0deaa38c-d4e2-4596-86b7-b39a3711b648/kufukaravalepelabe.pdfIn PDF document text
    • http://fisagibop.pbworks.com/f/69425079415.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3d7c178-6912-4e92-92da-92a69749401e/deepak_chopra_sleep_meditation_day_2.pdfIn PDF document text
    • http://gugatodoka.pbworks.com/f/free_download_classic_solitaire_windows_7.pdfIn PDF document text
    • http://kiletejude.pbworks.com/w/file/fetch/144895443/dunajalu.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_off0000f5f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F9 5112 bytes
SHA-256: ea0e5b384625a990a7299e59f4fcb376d73fafe807d25f813defb588319dc231
font_01_sfnt_off00010727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10727 11228 bytes
SHA-256: 98abcb8aa98465ed8681071085542b84a99c6f038cc03e7274b91ec422d65a38