Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c5b7fdb8ed36c10…

MALICIOUS

PDF

74.8 KB Created: 2021-03-20 22:29:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 260ff8011cb47b12ed342d42a270750f SHA-1: ade16257b8babb3a2d30b7a3eadfdbd4a307fb63 SHA-256: 7c5b7fdb8ed36c1043f7a85886e7bd4662e2287ac8eb4e0bb821a0b6b879411b
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/123?utm_term=hallmark+greeting+card+maker+free
    • https://pojewesam.weebly.com/uploads/1/3/1/4/131410485/bafixilesivekemaje.pdf
    • http://idealslim-ordina.site/600509990470362f.pdf
    • https://pifofunota.weebly.com/uploads/1/3/0/8/130814871/6474893.pdf
    • http://prod-fruit.space/muzeninewejuzunonzvjr.pdf
    • http://vumilopevakidom.iblogger.org/is_forged_in_fire_on_netflix_uk.pdf
    • https://gipofomodofomew.weebly.com/uploads/1/3/2/3/132303323/3ccdb9.pdf
    • https://xopapukewude.weebly.com/uploads/1/3/1/4/131408664/6490322.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/271f63d9-0586-4acf-b6e9-5bbf2ad8c29a/wuvubawenefekodidezuza.pdf
    • https://uploads.strikinglycdn.com/files/ad00c5d9-a72a-44e1-9e4e-3040346c6b14/rafopozirivepuzoda.pdf
    • https://b4e79a3f-0083-4b26-8056-4fe87fb46dfd.filesusr.com/ugd/332c1b_3494267b54fe4d5e94334898c7e1be1f.pdf?index=true
    • http://fituguguras.rf.gd/rowudinos.pdf
    • https://uploads.strikinglycdn.com/files/22d75ec2-0cb9-4ede-90a1-aad0c7bfaed8/mexuzosesabo.pdf
    • https://uploads.strikinglycdn.com/files/18a2314e-1265-4016-ab7e-b0aa77a06cde/vogadoderuvojobepizitusar.pdf
    • https://uploads.strikinglycdn.com/files/fe1d288f-1deb-4c64-bde0-95ce3c2ede24/99983278271.pdf
    • https://ca39a19f-16f9-469f-ab0b-65ec0463b8d0.filesusr.com/ugd/cc9b97_e2fe23fc8d584ffd80292a1723c28245.pdf?index=true
    • https://uploads.strikinglycdn.com/files/5c1263a7-3f4a-4184-8752-ed29f11083ad/xidizosovuxoke.pdf
    • https://uploads.strikinglycdn.com/files/500e7064-4a5a-45c8-9a24-08619c36cd34/john_deere_snow_thrower_parts_diagram.pdf
    • http://mukulug.rf.gd/24582225646.pdf
    • https://52a72965-a6d2-471e-b66a-59a59a4d663b.filesusr.com/ugd/e643da_231d5f013117434e9f39aede42745709.pdf?index=true
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8f9.bin
b15873c9ccaede055942518e95439ec268e1aa7df8de147630fa2b4609af0047		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F9 5188 bytes
font_01_sfnt_off0000fa89.bin
d897e9bcc4f00300906fce99caf1822c0b0e931f8bc52b89043085767a7b5b8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA89 10276 bytes

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