Malicious PDF — malware analysis report

Static analysis result for SHA-256 54b5ed061676f02f…

MALICIOUS

PDF

62.1 KB Created: 2020-12-01 14:51:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 2a951e9d98f96497a884b1f9bbf6cd1d SHA-1: 198391bd54e7fa5fc768ce949e0456e0b2a4e7fc SHA-256: 54b5ed061676f02f00b670960580314859c3949f6cd6cc3bdb572f120b1c20e9
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9996

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://traffset.ru/strik?utm_term=discord+mute+button PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380675/normal_5fadd4412b681.pdfIn PDF document text
    • https://jezagegilefu.weebly.com/uploads/1/3/4/3/134307882/d49662.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388165/normal_5fa4b0f82d2c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403824/normal_5f98872bf1a92.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408009/normal_5f9442018f053.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469135/normal_5fc28a5969ab9.pdfIn PDF document text
    • https://vozunutav.weebly.com/uploads/1/3/0/9/130969695/9063337.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/d558cb6f-9485-41d8-b4b0-48d00ad58d45/82456512873.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e84b9ae5-bc6a-4a0a-90e2-1e5ab56af0b7/jeff_nippard_back_hypertrophy_program_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88c5ad5a-841d-4a17-8f43-af0e0e05f544/48888107017.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4794d6a7-24a9-424b-955d-074dd30e0968/vfl_jyu_buhfnm_tcgkfnyj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/388d89c2-d71a-4b33-9bef-af9045329170/rawonif.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

Related samples 7

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB838 4984 bytes
SHA-256: 5ca6fc5e01d71d7770910914f4888a10586792507ffa00c1b097fc7b2917bd40
font_01_sfnt_off0000c914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC914 10352 bytes
SHA-256: 7a94419a3e0e0e1ceb4991fae3fcafbb0041461ff50f2559720cc91b89331780

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