Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4828c02fe482872…

MALICIOUS

PDF

75.0 KB Created: 2021-02-28 01:21:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: cc6a2d0e9a6b02dae936b58a79ee2520 SHA-1: 58d2ca744c0119a46faab135612d0b3b006e6eeb SHA-256: a4828c02fe482872483bbf7f2570bbb779ed6ce425bf5a84cf59465c0fcb1be5
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing trojan. It contains a large number of external links, many pointing to PDF files hosted on various domains, suggesting a link farm or SEO manipulation tactic. The primary URL, 'https://seumenha.ru/strik?utm_term=dante%2527s+inferno+book+review', is likely the entry point to this network of malicious links. No scripts were extracted, but the PDF structure itself facilitates the distribution of these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://seumenha.ru/strik?utm_term=dante%2527s+inferno+book+review PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4449968/normal_5fea2d3196741.pdfIn PDF document text
    • http://kopuvimu.scienceontheweb.net/radubiguf.pdfIn PDF document text
    • https://zurukuwimuso.weebly.com/uploads/1/3/4/3/134325804/xiwitifel.pdfIn PDF document text
    • https://rutejiredoratel.weebly.com/uploads/1/3/1/3/131383841/98c4f8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446174/normal_60029ff7c562f.pdfIn PDF document text
    • https://jadufebifov.weebly.com/uploads/1/3/4/6/134627690/aca072825f1d55a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366336/normal_5ff239a6167e3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477367/normal_600255bec9f6a.pdfIn PDF document text
    • https://sugelama.weebly.com/uploads/1/3/4/8/134898925/gizejadiweput.pdfIn PDF document text
    • http://dogalijun.scienceontheweb.net/nigefudifisin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406466/normal_60392ef8c4c3b.pdfIn PDF document text
    • https://ligonulijer.weebly.com/uploads/1/3/5/3/135318365/7622068.pdfIn PDF document text
    • https://fosijegaden.weebly.com/uploads/1/3/4/8/134868146/d5b2e6c299.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375716/normal_5fc6225b49885.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://zitadufafasid.onlinewebshop.net/aplicacion_para_monitorear_mi_red_wifi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB2 4904 bytes
SHA-256: 365a23725309c33177459551567a3082cb2d05bdbee3bdddf55287cc2d877ae5
font_01_sfnt_off0000ed84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED84 10412 bytes
SHA-256: 0faf79980f8e822afe5b91258e357b961bd13bc6f8b331f380328941a4e17433
font_02_sfnt_off000110e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E2 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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