Malicious PDF — malware analysis report

Static analysis result for SHA-256 b731d6c1ff847b87…

MALICIOUS

PDF

71.3 KB Created: 2021-02-02 10:40:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 105d579dd605dc30565e21bc60d6f6b8 SHA-1: 9bf153fed97c0d6c8b8940d7900fc2b231ca1320 SHA-256: b731d6c1ff847b871b11da6e6383bb96128e48195fd0a22c1f4007ef75c7906c
164 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ML classification and ClamAV, indicating malicious content. It contains numerous external links, suggesting a link farm or a method to distribute further malicious content. The presence of a download button lure and the embedded URLs point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://maypoin.ru/aws?utm_term=calcutta+university+msc+application+form+2019 PDF link annotation
    • https://cdn.sqhk.co/kowetitemaro/6wjdUjg/juegos_de_shark_simulator_beach_killer.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392463/normal_5fc69cede268d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468814/normal_5fc5b47d254f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484605/normal_5feaf3f7309db.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379974/normal_5fe1ca0d6791e.pdfIn PDF document text
    • https://cdn.sqhk.co/leperanurosi/fjeu5ge/hill_climb_racing_2_moonlander_cost.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501503/normal_5fd7c478eccb3.pdfIn PDF document text
    • https://cdn.sqhk.co/tazifawixax/7ciblgh/gopuwofave.pdfIn PDF document text
    • https://rovisudaguxu.weebly.com/uploads/1/3/1/4/131438800/dafefosobekenajoz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365525/normal_5fe686e73b4db.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385038/normal_60010d2d8ea74.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/liguwubore/baxotiv.pdfIn PDF document text
    • https://s3.amazonaws.com/safenalavojuwu/72815366881.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_off0000d62a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD62A 5708 bytes
SHA-256: aea68d291b3bf9c1daae6facc254d55ab3e5764d5e0f1e357e667e88ef78dff3
font_01_sfnt_off0000e996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE996 10800 bytes
SHA-256: 694ff9fe591d025c55e6ff8c376b2afaf40e74b92759a04151671dea6596c1f4

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