Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddf42b6824515668…

MALICIOUS

PDF

70.8 KB Created: 2020-12-26 08:46:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: c9c8f652df1cd311e47b65c712e575cd SHA-1: 33c58265c064a3a55b653b085ffcdf7d794afdcd SHA-256: ddf42b682451566852bb15d691820fc1aea84b14f5ae1a08d028416852073a81
196 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDFs, suggesting a link farm designed to obscure malicious activity. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to download a password-protected archive, a common tactic to evade static analysis. While no scripts were explicitly extracted, the presence of PDF_URI and ML_NYX_PDF_MALICIOUS firings, along with ClamAV detection, strongly suggests malicious intent.

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://trafffe.ru/aws?utm_term=aerosmith+greatest+hits++zip PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374359/normal_5f8f46a054670.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486550/normal_5faafabc76fc5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372983/normal_5fe5a52369eb8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413019/normal_5f96d1ab46150.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428061/normal_5fbc6c1a7f11a.pdfIn PDF document text
    • https://zagumukukawikam.weebly.com/uploads/1/3/4/6/134608037/0202f93f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369793/normal_5f8e7c66b7196.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384817/normal_5f920b95a6f72.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449185/normal_5fcca05975cbc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370052/normal_5f96c249329be.pdfIn PDF document text
    • https://kutemipemowu.weebly.com/uploads/1/3/4/8/134860595/9cd57f3535a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484126/normal_5fe01f4c3dc58.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/juvuraguvutoxif/live_on_in_my_love_lyrics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/163c5565-60d8-44a1-9d8c-cffe557110aa/touhou_remilia_theme.pdfIn PDF document text
    • https://s3.amazonaws.com/donarepemi/datepicker_format_c.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_off0000d2ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2AD 5240 bytes
SHA-256: d168c42ece1e17b3e775e42a6506002122da4258c0a45fe6ee90f2bd3745cf0f
font_01_sfnt_off0000e460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE460 13084 bytes
SHA-256: 874ab5472b0d89091e62e869c259396bbe893feac4b3273433bfeb1d079a930e

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