Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5b27840c3cb3b8a…

MALICIOUS

PDF

77.3 KB Created: 2022-05-27 20:58:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2022-07-15
MD5: 239a2cad991e0b17453c343447e96100 SHA-1: bc323a9e0f94c4e43e2373bed3051390e7367a95 SHA-256: a5b27840c3cb3b8a4143c66f1edcb1ba4c7db78f81c906a99f5f222cc6a16f36
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, many of which point to other PDF files hosted on various domains. This behavior is indicative of a link farm designed to distribute malicious content or engage in SEO manipulation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these linked resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ragaz.co.za/YmrXLWy8?keyword=printable%20softball%20scorebook%20pdf%20free%20printable%20sheets%20printable PDF link annotation
    • http://rpsbchamber.org/editorData/file/9181272429.pdfIn PDF document text
    • http://unite-chem.com/upload/files/ninered.pdfIn PDF document text
    • https://zilisekisami.weebly.com/uploads/1/3/1/4/131437354/3716735.pdfIn PDF document text
    • https://lightart-collection.com/UserFiles/files/1284755359.pdfIn PDF document text
    • http://guss-ex.de/uploads/fck/file/wajebef.pdfIn PDF document text
    • https://diwodineguxep.weebly.com/uploads/1/3/4/3/134305573/folepabaxujobibaju.pdfIn PDF document text
    • http://www.nstrechy.cz/upload/files/jinalumazomebixurinu.pdfIn PDF document text
    • https://visuzajekug.weebly.com/uploads/1/3/4/3/134305902/pogipupidevomodimiva.pdfIn PDF document text
    • https://lurenejaxerugu.weebly.com/uploads/1/3/4/7/134728533/gugofexiferi-tavurojepifiv-xiloz-jepebi.pdfIn PDF document text
    • https://xurigaguk.weebly.com/uploads/1/3/4/6/134635426/solut_sobixoxami_kixezowetagonif.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/49711525507.pdfIn PDF document text
    • https://kakadaten.weebly.com/uploads/1/3/0/9/130969907/b200fc98c7f9a5.pdfIn PDF document text
    • https://ziregorex.weebly.com/uploads/1/3/5/3/135351653/gugojujevudapofim.pdfIn PDF document text
    • https://rilofope.weebly.com/uploads/1/3/4/6/134630674/doloj-maluruzoxape-texomifunulate.pdfIn PDF document text
    • https://espaciocultivarte.com/ckfinder/userfiles/files/33898916306.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/rufuvisa.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/pawuraru.pdfIn PDF document text
    • https://laduvuwipubi.weebly.com/uploads/1/4/1/3/141372205/sowozu_pujuvizam.pdfIn PDF document text
    • https://basisangka.com/contents/files/bixejilazixezum.pdfIn PDF document text
    • https://mikakomigat.weebly.com/uploads/1/3/6/0/136054060/dezevafitiledo.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC796 16680 bytes
SHA-256: e10a345f8382584308a75562e20a4e32617e0f8c808c024aa4c44fdcab79e5f5
font_01_sfnt_off0000f2f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B0F 10948 bytes
SHA-256: 8f65d1d3c9df4a5878d3dd8a578c16b35e11193d608c6834efd1c997a98f51a8