Malicious PDF — malware analysis report

Static analysis result for SHA-256 963cc7cc7dcd410c…

MALICIOUS

PDF

68.2 KB Created: 2020-11-23 13:56:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 89322a4c41dc3266e13dbc922fe69e14 SHA-1: 7b77c2d9f7fc65ff47e277ca4c81981b1a6dfde5 SHA-256: 963cc7cc7dcd410cf6ed6527672d0b76a972bb2f02d18b297092b87c456441e1
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to obscure domains and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or SEO abuse. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to redirect users to potentially harmful content.

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-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://trafftec.ru/strik?utm_term=ashley+recliner+replacement+parts
    • https://xexovelez.weebly.com/uploads/1/3/0/8/130813416/8d7fb8f.pdf
    • https://kixatefibav.weebly.com/uploads/1/3/0/7/130776592/bibotizorijawupo.pdf
    • https://cdn-cms.f-static.net/uploads/4492871/normal_5fb59f0508fe2.pdf
    • https://josadezabo.weebly.com/uploads/1/3/4/4/134490641/mupevotawadexar_meterubisulet_mivetolakogesa.pdf
    • https://zirufifun.weebly.com/uploads/1/3/0/8/130874679/8917132.pdf
    • https://cdn-cms.f-static.net/uploads/4374368/normal_5f8a8b4ace5a8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/601606bf-6b36-4824-abab-81087d74080a/viva_video_mod_apk_download.pdf
    • https://uploads.strikinglycdn.com/files/60448484-763c-4f63-b63f-6eb1512894da/sipupagasorodi.pdf
    • https://uploads.strikinglycdn.com/files/2ce7fa0a-9f98-4e58-a5c0-6fc1acb0f074/81233348498.pdf
    • https://s3.amazonaws.com/sefipa/xomata.pdf
    • https://uploads.strikinglycdn.com/files/692092ea-b117-414a-9e9d-477b02651f1a/80321279895.pdf
    • https://uploads.strikinglycdn.com/files/484feeb8-ecdd-429e-bd02-41ae870e349e/87682729493.pdf
    • https://uploads.strikinglycdn.com/files/62811255-9bd0-4f3a-a3d6-1ffb91d3151f/sony_nsx_40gt1.pdf
    • https://uploads.strikinglycdn.com/files/14425be6-46d2-4e2c-8f54-a5d281c91040/19309649856.pdf
    • https://uploads.strikinglycdn.com/files/243c8f53-2a17-4982-ac24-1a280824705b/54352022635.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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ceb6.bin
9760e62d27eecb3b16c61d28c1405c0e2265bf2045d09896c7ab4ed35eced045
pdf-font-stream PDF embedded font (sfnt) at offset 0xCEB6 5264 bytes
font_01_sfnt_off0000e07a.bin
06e9754b34a727787237eaa912d6863493d1b6ccf897c93c0fcb5ae5d4addc70
pdf-font-stream PDF embedded font (sfnt) at offset 0xE07A 10516 bytes