Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6923980ed771a80…

MALICIOUS

PDF

66.2 KB Created: 2020-11-11 13:22:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 1b94ac47efbc6c1afdc80632676819ea SHA-1: 90ed8a584c2f44f1a8dfc8dd9b0a48ce1735ac75 SHA-256: d6923980ed771a80e1314fb697c3bed9c5fa2748bcc1c1d4745e036f79f98a5e
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 0.9998

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://traffking.ru/123?keyword=is+667+a+good+credit+score PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4381980/normal_5f9fc073ceb27.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365657/normal_5f898850851ad.pdfIn PDF document text
    • https://riragojefo.weebly.com/uploads/1/3/1/8/131857115/vidabaranibul-rivenijenudad-kiwon-vitobugozukiriv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379230/normal_5f8b77858f0f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412154/normal_5f94ae76cc93f.pdfIn PDF document text
    • https://javodamujuwevef.weebly.com/uploads/1/3/4/4/134446411/3631288.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/22092fe0-2326-41e1-96af-160490437c58/wixeketetivigonemi.pdfIn PDF document text
    • https://s3.amazonaws.com/jepinebawo/95297996975.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/628c7717-7ca4-4f1a-bb2a-42573d2336f8/go_math_grade_5_chapter_11_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a80bf185-a292-4a47-b1df-7a2ed07d68de/fomuvepikiwumogidegowavem.pdfIn PDF document text
    • https://s3.amazonaws.com/tenunud/joana_wow_guide_addon.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_off0000c5d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5D6 5248 bytes
SHA-256: 56baac615d8423d868572b1ebfcdf423eff0d093a8b332d25cd6fa03e096c379
font_01_sfnt_off0000d7c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C5 10792 bytes
SHA-256: 805549930eb47e2a6948b0d4710735a05ec602ae3eca1420a6744d3f0e133fbc