Malicious PDF — malware analysis report

Static analysis result for SHA-256 3256e1438a143a15…

MALICIOUS

PDF

115.4 KB Created: 2020-11-17 23:57:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: ca47ae32ee3376cc4d662147bb112753 SHA-1: ec43a47c93783b33f41f3304040bfefd6c0dd35d SHA-256: 3256e1438a143a15bff97811b4759f2563aaacde0961243bf3183e05a0d69596
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or link farm attack. It contains a large number of external links, many pointing to PDF files hosted on various domains, suggesting an attempt to distribute content or redirect users to potentially harmful sites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly indicate a malicious intent to manipulate search engine results or drive traffic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffi.ru/123?utm_term=us+age+of+consent+by+state PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413703/normal_5fad9f7206ba6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368972/normal_5f887372171c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379359/normal_5fa6d6a841b98.pdfIn PDF document text
    • https://muwamobole.weebly.com/uploads/1/3/4/3/134356931/8456965.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368240/normal_5f886adb84809.pdfIn PDF document text
    • https://tovoginimu.weebly.com/uploads/1/3/4/3/134379987/sowetunugemopadona.pdfIn PDF document text
    • https://zevigetadafuwun.weebly.com/uploads/1/3/0/9/130969942/jafutuwafededodi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379053/normal_5f9004d6aea0b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368781/normal_5f93fbb864780.pdfIn PDF document text
    • https://megadezatesaram.weebly.com/uploads/1/3/0/7/130776649/takewi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/wifozuxeku/gijugegevikokokezaver.pdfIn PDF document text
    • https://s3.amazonaws.com/bejideba/sovipufa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2f8fac5-27cb-4cc8-a1b8-0d1192d79ed0/59930213047.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17824 4896 bytes
SHA-256: 271ffe0be8a3d40ea032993a3ec7e183317101f2afa9035997c9fd31a1988d41
font_01_sfnt_off000188e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x188E0 12516 bytes
SHA-256: a858e8aec0806e333dadab84fef756f713645198f6e72258bc744e9804ffbcfc
font_02_sfnt_off0001b114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B114 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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