Malicious PDF — malware analysis report

Static analysis result for SHA-256 3976d5faa630a14f…

MALICIOUS

PDF

74.7 KB Created: 2021-01-06 20:45:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 172b0713a63f03cb05ab03e52865f359 SHA-1: 42bbded1cc5eda1dbb8901c1d7ef99c09233cdaf SHA-256: 3976d5faa630a14f8362aac16ea28a4a8ac74616e495cc69788d265b81c76b7c
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including links to known malicious redirectors and a link farm. The ML classifier and ClamAV detection strongly suggest maliciousness. The embedded URL points to a redirector, likely intended to lead the user to a phishing or malware distribution site.

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
  • 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://gettraff.ru/123?utm_term=lukat+fix+it+malaysia In PDF document text
    • https://jiwepurojal.weebly.com/uploads/1/3/0/7/130775762/juwunal.pdfIn PDF document text
    • https://bewepuxajijasi.weebly.com/uploads/1/3/4/3/134362307/3838487.pdfIn PDF document text
    • https://batagokefo.weebly.com/uploads/1/3/1/0/131070859/senula.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/41a10555-11a9-4a15-b192-3c879a3e54b4/michael_h_hart_the_100.pdfIn PDF document text
    • https://s3.amazonaws.com/kepevipawit/90238014146.pdfIn PDF document text
    • https://s3.amazonaws.com/sugowubuf/63339270547.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1d4b5aa-80da-4347-bee5-c036d46d9f51/lyme_disease_map_usa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03c71c4f-598c-42bf-bbdd-ecf43cb65df3/94298360290.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8af89451-753e-4f2e-b21d-e529902a65e5/braden_scale_score_17.pdfIn PDF document text
    • https://s3.amazonaws.com/matogapibelifiv/57262410995.pdfIn PDF document text
    • https://s3.amazonaws.com/tubupejevomo/48941658148.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_off0000e6b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B7 4992 bytes
SHA-256: 0f86b7b956850c6385329644421029f5f683fcfdc611e96d865f13a8700af41c
font_01_sfnt_off0000f7c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C2 11280 bytes
SHA-256: 93014e4a4d3acea4878bc437244c3be47de79f465029c6b2b029fb22402a9c52

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