Malicious PDF — malware analysis report

Static analysis result for SHA-256 0239b7c6fa896c35…

MALICIOUS

PDF

103.0 KB Created: 2020-12-02 10:47:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 748c44f059ae03b00a135877918a954b SHA-1: df15414335349b02810234aacb9fe9516ff04199 SHA-256: 0239b7c6fa896c35fc7d4ad1fcba298e085b0eb947d52d6411347795ef53ae18
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/aws?utm_term=patent+ductus+arteriosus+journal+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4403140/normal_5f9532465ed3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425507/normal_5fa4f418017eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465269/normal_5fad935f5ebbd.pdfIn PDF document text
    • https://viziwebaf.weebly.com/uploads/1/3/3/9/133999863/3109693.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453900/normal_5fad6633b57f0.pdfIn PDF document text
    • https://sabijodamibig.weebly.com/uploads/1/3/0/7/130775907/wudikosozix-sutomi-romodexusabi-lujogeli.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/xonaxevetaf/34329543397.pdfIn PDF document text
    • https://s3.amazonaws.com/jenisozazewubo/mrs_downes_saint_denis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1e80324-64f8-498c-8274-f8bb8b8fc373/what_is_meant_by_mainstream_class.pdfIn PDF document text
    • https://s3.amazonaws.com/jukoxisojow/dumovamosaje.pdfIn PDF document text
    • https://s3.amazonaws.com/zikeko/forabebilubibesin.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/setoluwuzewup.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/77326374434.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ef25710-0c2e-42de-a32f-ddb335ebec59/92555704246.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14993 5108 bytes
SHA-256: 227301f620d7bf113559b5bc81e8d95399900489d077ed9043103be604a7bf72
font_01_sfnt_off00015af8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AF8 11556 bytes
SHA-256: 3fe9e69d56d5a6572c249a24ad978a1a22be75a48a478b3144d7058966e4f406
font_02_sfnt_off000180f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x180F7 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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