Malicious PDF — malware analysis report

Static analysis result for SHA-256 b90f9a8bde74b038…

MALICIOUS

PDF

78.7 KB Created: 2020-11-24 20:03:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 7914ac58b34e9102b5ea5649952c3aac SHA-1: 1ca6d5bd5d25f8b9869c9b8a6bcc59eafd600e86 SHA-256: b90f9a8bde74b0387e1ce7f21ef563da63cb40436d78c6d36a98bc5673bc7efe
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links that redirect to a known malicious URL, indicating a phishing or malware distribution attempt. The presence of a large number of external PDF links also suggests a link farm, often used to boost SEO for malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded links are strong indicators of malicious intent.

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://gettraff.ru/123?utm_term=ark+angel+book+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4379842/normal_5f90b5d0d757e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374207/normal_5f8a906ae16d1.pdfIn PDF document text
    • https://jugurapofan.weebly.com/uploads/1/3/4/3/134339640/zolata_satasovo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425926/normal_5fbbb11295f8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385634/normal_5f8f68ecb5b7c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365545/normal_5faf8c5ca5364.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370303/normal_5fa9ffea99f60.pdfIn PDF document text
    • https://raboxodibol.weebly.com/uploads/1/3/4/0/134096122/4176225934fe.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/rebesudanolo/75338382729.pdfIn PDF document text
    • https://s3.amazonaws.com/gezetega/how_to_calculate_enthalpy_change_given_bond_energy.pdfIn PDF document text
    • https://s3.amazonaws.com/gagagakigibapo/18573257402.pdfIn PDF document text
    • https://s3.amazonaws.com/zategafozasiru/13138182047.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_off0000f733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF733 5224 bytes
SHA-256: ca221c6ec65932f04639c0bb0899c5177a07eb5f53fd00a793f1b755db777fda
font_01_sfnt_off0001090b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090B 10996 bytes
SHA-256: a3a64e390881734e0f9afb41c16dd27c88a1c93993e3b940eeeb0fd92760ee8e

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