Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ca45186a2b5c53b…

MALICIOUS

PDF

79.9 KB Created: 2021-02-06 19:27:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 13494534ca69671058230474c4bffec1 SHA-1: 6fbfd661c6e813acba934d1a095c60c2a9576be1 SHA-256: 7ca45186a2b5c53b0c05298485f71e5a60fcc040633e7b3c29d48109c6d4c6ee
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as phishing and trojan activity. While no scripts were directly extracted, the PDF structure and numerous external URLs point towards a phishing lure for malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://baarspo.ru/123?utm_term=sony+vaio+pcg-71913l+wifi+driver PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4418399/normal_5ff9afd0bdc01.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454562/normal_600c6f9b08bd4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403946/normal_5fd11af42387e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388598/normal_5fd72bae926a5.pdfIn PDF document text
    • http://aicberg.net/gta_4_trke_yama_almay_durdurdu_hatasl1n38.pdfIn PDF document text
    • https://vexakoloninabi.weebly.com/uploads/1/3/4/8/134851928/doradebexediwo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391024/normal_5fcd5666e0bd2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451229/normal_601724259989b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369310/normal_5ffc4eae6417c.pdfIn PDF document text
    • http://help-violation.com/598215293346xdsj.pdfIn PDF document text
    • http://fatiberekizibu.iblogger.org/75197271005.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454303/normal_5fd1325b9b546.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376602/normal_601a74460e77f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479451/normal_5fdc3efb35d13.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368238/normal_600f82c7546c7.pdfIn PDF document text
    • http://afracheat3.xyz/test_de_ansiedad_de_hamilton_descargarsr62j.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pesafitibum.epizy.com/48157986553.pdfIn PDF document text
    • http://wurozuvejesubot.epizy.com/alarm_clock_dock_for_android_phone.pdfIn PDF document text
    • http://lagarudu.epizy.com/checkpoint_appliance_4600_datasheet.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_off0000f398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF398 5988 bytes
SHA-256: d104d2625b40dd2e2ca85fd235dd13053c78367623ea5dfe59803b827faeb268
font_01_sfnt_off0001083e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1083E 13808 bytes
SHA-256: 0956f047ac6b472c2c584dbe067c550732ca385d1e5882e6a20b2561357f0365

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