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
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a significant number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, pointing to various domains. The ML classifier and ClamAV detection strongly indicate malicious intent, with ClamAV identifying it as a phishing trojan. The primary attack pattern involves directing users to potentially malicious websites via these embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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
    • http://rpsbchamber.org/editorData/file/9181272429.pdf
    • http://unite-chem.com/upload/files/ninered.pdf
    • https://zilisekisami.weebly.com/uploads/1/3/1/4/131437354/3716735.pdf
    • https://lightart-collection.com/UserFiles/files/1284755359.pdf
    • http://guss-ex.de/uploads/fck/file/wajebef.pdf
    • https://diwodineguxep.weebly.com/uploads/1/3/4/3/134305573/folepabaxujobibaju.pdf
    • http://www.nstrechy.cz/upload/files/jinalumazomebixurinu.pdf
    • https://visuzajekug.weebly.com/uploads/1/3/4/3/134305902/pogipupidevomodimiva.pdf
    • https://lurenejaxerugu.weebly.com/uploads/1/3/4/7/134728533/gugofexiferi-tavurojepifiv-xiloz-jepebi.pdf
    • https://xurigaguk.weebly.com/uploads/1/3/4/6/134635426/solut_sobixoxami_kixezowetagonif.pdf
    • https://bepxuyenviet.com/upload/files/49711525507.pdf
    • https://kakadaten.weebly.com/uploads/1/3/0/9/130969907/b200fc98c7f9a5.pdf
    • https://ziregorex.weebly.com/uploads/1/3/5/3/135351653/gugojujevudapofim.pdf
    • https://rilofope.weebly.com/uploads/1/3/4/6/134630674/doloj-maluruzoxape-texomifunulate.pdf
    • https://espaciocultivarte.com/ckfinder/userfiles/files/33898916306.pdf
    • http://meubelenindex.nl/images/uploads/rufuvisa.pdf
    • https://larioenergy.net/uploads/file/pawuraru.pdf
    • https://laduvuwipubi.weebly.com/uploads/1/4/1/3/141372205/sowozu_pujuvizam.pdf
    • https://basisangka.com/contents/files/bixejilazixezum.pdf
    • https://mikakomigat.weebly.com/uploads/1/3/6/0/136054060/dezevafitiledo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

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