Malicious PDF — malware analysis report

Static analysis result for SHA-256 4791094080b6d935…

MALICIOUS

PDF

120.4 KB Created: 2020-11-10 18:14:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5e5cbfd3e111631951c2187ba551da29 SHA-1: ed36bfcf404fe68ed15c071006bc063ed3e3000c SHA-256: 4791094080b6d935ba790f53ce55b094d0dec346b7fec01b787418c41a90c8a3
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for link farms or phishing sites. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, with one prominent example being 'https://melubezu.weebly.com/uploads/1/3/4/3/134311229/31109b495278.pdf'. The presence of embedded URLs and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggest malicious intent, likely to redirect users to malicious content or download further payloads.

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://trafficel.ru/strik?keyword=lorenzo+s+oil+worksheet+pdf
    • https://melubezu.weebly.com/uploads/1/3/4/3/134311229/31109b495278.pdf
    • https://vopevejefed.weebly.com/uploads/1/3/1/6/131606133/5841c67d8.pdf
    • https://zirasave.weebly.com/uploads/1/3/4/0/134096010/porevekopabob-dewotaj-dunegebuzobe.pdf
    • https://zuwumepegowivos.weebly.com/uploads/1/3/1/0/131069935/9124817.pdf
    • https://jatorogerujew.weebly.com/uploads/1/3/2/7/132710569/ruxozukozuvazu.pdf
    • https://nimediwajukijiz.weebly.com/uploads/1/3/4/5/134501673/dfcbc163513f1.pdf
    • https://gikovasedubum.weebly.com/uploads/1/3/4/5/134507074/jokenajiro-maxidiviwaxel.pdf
    • https://cdn-cms.f-static.net/uploads/4365551/normal_5f88f6066a6ba.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/9785775c-77b2-4723-b21e-351567001e26/48547597638.pdf
    • https://s3.amazonaws.com/tadovu/77405429616.pdf
    • https://uploads.strikinglycdn.com/files/36f82b16-a517-443d-8eca-6379ed16061b/81468097853.pdf
    • https://uploads.strikinglycdn.com/files/09d4227f-8f1d-4ad6-8ca6-81af4be356de/78560167621.pdf
    • https://uploads.strikinglycdn.com/files/e6dfb183-fc0a-4b6d-8a88-162410e84854/witates.pdf
    • https://uploads.strikinglycdn.com/files/1596496b-f7ed-4394-b87d-015453ba815b/staar_us_history_2016_answers.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_off00019bc6.bin
9c7daa2f9f1336e597cced1a49a3b24363cff23d6b8063c136fae113b2335bb9
pdf-font-stream PDF embedded font (sfnt) at offset 0x19BC6 5068 bytes
font_01_sfnt_off0001ad1e.bin
4ea77a6d91e2b0f1b2ea1ec2698a842b1d481df1da4794500c6d585067912742
pdf-font-stream PDF embedded font (sfnt) at offset 0x1AD1E 10956 bytes