Malicious PDF — malware analysis report

Static analysis result for SHA-256 79c83ae53b65becf…

MALICIOUS

PDF

73.9 KB Created: 2020-12-29 11:44:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f9362870303e94f36936bbdfcea98037 SHA-1: 816fcf6738071af710aa7bca1c9be71e6527e0e1 SHA-256: 79c83ae53b65becfdfa3fb15e30818f56ec0e9feb04962f7cd43719a302497b6
164 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 Weebly, suggesting a link farm designed to manipulate search engine rankings or distribute malicious content. The presence of urgency language further supports a phishing or scamming intent. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://traffking.ru/strik?utm_term=buy+real+followers+instagram+2020
    • https://polabufasol.weebly.com/uploads/1/3/2/8/132814050/saxibafu.pdf
    • https://xokebewogaxuwu.weebly.com/uploads/1/3/4/5/134588239/04831f66359d4c8.pdf
    • https://batarodev.weebly.com/uploads/1/3/1/3/131380453/zorurozavi.pdf
    • https://jakemujilofadam.weebly.com/uploads/1/3/1/3/131380171/kabelepuretana_siwate.pdf
    • https://guxedujigizos.weebly.com/uploads/1/3/4/7/134735137/7862844.pdf
    • https://xoverepidagagit.weebly.com/uploads/1/3/4/4/134469055/5367606.pdf
    • https://cdn.sqhk.co/tatiderubota/gcgjeRX/create_a_list_in_excel_sheet.pdf
    • https://muzokive.weebly.com/uploads/1/3/4/4/134498707/jugusanamati_bifulemetazoses.pdf
    • https://satufimitu.weebly.com/uploads/1/3/4/7/134715308/4894515.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d3881ef3-a504-4f77-8e14-832f64e624e4/94260716367.pdf
    • https://uploads.strikinglycdn.com/files/29c4c241-0a06-415e-88f5-54e9ca938352/saraderogex.pdf
    • https://uploads.strikinglycdn.com/files/48d63975-97de-44d1-aea2-ba7199025982/77845434156.pdf
    • https://uploads.strikinglycdn.com/files/e703e696-deae-4fd8-a3f7-b091df2d1ac4/40251015333.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_off0000e136.bin
58a104fd75e644f855f4cca24d5b567e3586c21de45c9fc461eedfcc846a0d1a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE136 5604 bytes
font_01_sfnt_off0000f457.bin
ba12e3693d9bce93e261032bcebb85ccf42cde29776feb81372bc5066e03d18c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF457 11368 bytes