Malicious PDF — malware analysis report

Static analysis result for SHA-256 b33c310c2b27bb52…

MALICIOUS

PDF

69.1 KB Created: 2020-11-25 09:07:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: ebbe3a0d7abd5fcc57fc7cf1bd27cd03 SHA-1: d1035372c3de37772bf1e59c67a23722a459168b SHA-256: b33c310c2b27bb52fc86bde655a24f27bbf4a037345a6a6623bbabc8a825f465
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, a technique often used in SEO link farms to manipulate search engine rankings or redirect users to malicious sites. ClamAV and ML classifiers identified this PDF as malicious, specifically flagging it as a phishing trojan. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest an intent to redirect users to potentially harmful content.

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://trafffe.ru/strik?utm_term=1992+miata+shop+manual PDF link annotation
    • https://bujerawesu.weebly.com/uploads/1/3/4/4/134438781/wuparube_sulosaronalix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420036/normal_5fbce8ad65a50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369923/normal_5f8a41d09e22f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444353/normal_5f9d33210254f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387565/normal_5f90e9824188d.pdfIn PDF document text
    • https://kogevinipuban.weebly.com/uploads/1/3/4/5/134514077/fesetevexa-fajimuke-mufesef-garigufurip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495393/normal_5fab8cd3d4f0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450884/normal_5fa357ec74d92.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401703/normal_5f9fcaa827959.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375507/normal_5f91f13192b45.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393925/normal_5f9ebbac718a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381528/normal_5f950b04387fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424682/normal_5fa3e5cb6d673.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379736/normal_5fa232867fe29.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/salosibejodod/remove_watermark_xchange_editor.pdfIn PDF document text
    • https://s3.amazonaws.com/rokuwapesu/ruwukelatu.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_off0000d07c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD07C 5208 bytes
SHA-256: 26b0a69f711431ff498998df1493f80726b57bd7e75a33e5711597e40187b605
font_01_sfnt_off0000e210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE210 11076 bytes
SHA-256: ebe8960db96431d1d2b5ca6b49131a676c46bb04a8978bf9ba2f7b01c29f0524

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