Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e2b4f932553d17d…

MALICIOUS

PDF

118.7 KB Created: 2020-11-22 15:32:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 926557117c7003de5b786417a0f1ce9f SHA-1: 17f2ce70b3b7a9858752963914c1abba4643c019 SHA-256: 3e2b4f932553d17dedc75c67466ca3b667b1fcc3d7cce1f2ac421e85d4d9fd42
164 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 PDF files hosted on file-sharing services, suggesting a link farm or SEO poisoning tactic. The presence of urgency language further supports a phishing or malicious redirection attempt. While no scripts were directly extracted, the PDF structure and heuristic firings indicate malicious intent, likely to redirect users to malicious sites.

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://traffnew.ru/aws?utm_term=skillshop+google+answers PDF link annotation
    • https://mosozedap.weebly.com/uploads/1/3/1/8/131856454/bexiwibibuviriw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407795/normal_5fa5bd48b550d.pdfIn PDF document text
    • https://katatowuli.weebly.com/uploads/1/3/4/8/134879603/wijaruri.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368469/normal_5faab2e4bae0c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458824/normal_5faa5476883c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366350/normal_5fb85ff54d30e.pdfIn PDF document text
    • https://pigogokeda.weebly.com/uploads/1/3/1/8/131857695/2022221.pdfIn PDF document text
    • https://wojegapemepuwa.weebly.com/uploads/1/3/4/0/134096127/6758309.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485930/normal_5faf3a3b21b25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367646/normal_5f8b238378e02.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/henghuili-files/93071167754.pdfIn PDF document text
    • https://s3.amazonaws.com/nakevoja/3m_strip_caulk_lowes.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18084 5340 bytes
SHA-256: 8cfca46920b2090e9a7ef714a49bdb7cd7274c4f49ecb096877abf134501458d
font_01_sfnt_off000192c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x192C0 11056 bytes
SHA-256: 9a416e6c011c5c3ed945e5056170e4c5cdff7ca65985f3ead65358958f52e7ec
font_02_sfnt_off0001b88b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B88B 16148 bytes
SHA-256: 64f21e55c2f29c6f605e8f9fd96e7f7b34f9b4a26fdc717ddead948457370e3b

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