Malicious PDF — malware analysis report

Static analysis result for SHA-256 a39fbfe78a69a6e1…

MALICIOUS

PDF

68.6 KB Created: 2020-11-25 02:11:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 70c7f4b14735faacf6801f2166f2e336 SHA-1: 968360e84c53730961e540dece606e50b5925e64 SHA-256: a39fbfe78a69a6e138501e71dd97c26d78e9d4832e64b468bf8b3d33cf44549d
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://traffnew.ru/strik?utm_term=programming+massively+parallel+processors+third+edition+pdf PDF link annotation
    • https://suvibumaluri.weebly.com/uploads/1/3/4/4/134458401/zejefopobomi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501998/normal_5fbc39324dc18.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366374/normal_5f8710584d8a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413851/normal_5fa59876c1303.pdfIn PDF document text
    • https://latijazaw.weebly.com/uploads/1/3/4/3/134312978/683200c9ff.pdfIn PDF document text
    • https://xanugobolenaz.weebly.com/uploads/1/3/4/3/134371028/wegenanunegedi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f771ae4-f646-4ab1-a530-0cfad29bcb74/majuxup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fc830a8-2012-4a9d-8d05-ff02b1360619/85463102962.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d35dbe1-e15e-4781-9452-4da3f23f4e10/chevron_toy_cars_value.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce7b7901-7399-4f89-84c4-e90190c0ee93/pc_assembly_rnekleri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4219d988-d697-4e2a-b8ed-2002b6037d9c/jamukopawip.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE1 5732 bytes
SHA-256: 67b262c696dba9b365557be57f90d38fcf211c3964673349d11c3b4e90613758
font_01_sfnt_off0000e243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE243 10316 bytes
SHA-256: a54efd983eba2884819253d2d1ea2e973f89ce84a5e48de7c793ee85b1d42519