Malicious PDF — malware analysis report

Static analysis result for SHA-256 f09fcc91758a9d8f…

MALICIOUS

PDF

121.9 KB Created: 2020-11-23 23:25:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: f7d2a87b7336973cef47fbeea8a18b2a SHA-1: ea6416f890003bbe5e80a0b785df74dded450535 SHA-256: f09fcc91758a9d8f8ebd225154b7dcb1d28040e0d22f3493f12e40c141c20a58
176 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains a link farm of external PDFs and a specific URL that appears to be part of a phishing or scam operation. The presence of embedded URLs and the PDF structure suggest it's designed to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://trafficel.ru/123?utm_term=marieb+anatomy+and+physiology+coloring+workbook PDF link annotation
    • https://gewosawoma.weebly.com/uploads/1/3/0/7/130739201/tujaz-zinitikaj-xelutizij.pdfIn PDF document text
    • https://pumowurunumig.weebly.com/uploads/1/3/2/7/132740285/ninix-jakofa-rekano.pdfIn PDF document text
    • https://xikagarema.weebly.com/uploads/1/3/4/4/134489929/727ccdb7c.pdfIn PDF document text
    • https://nijeliwawinezim.weebly.com/uploads/1/3/4/4/134497061/1477338.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418185/normal_5fa5983a995b7.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/e2aa0a18-1624-45d7-917e-49896975a29f/1024631286.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ab21c58-bcfe-4303-8096-accacc3a2697/21925448249.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abba225f-49dd-44a7-a358-37f6e3f5afbd/53744168600.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8020cd0c-bb00-4d7d-81a5-da3451a8163c/ophelia_rain_porn.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2862af6-d8c2-428d-a6d6-78e3f802c72b/29406214911.pdfIn PDF document text
    • https://s3.amazonaws.com/liluvad/allergenen_informatie_starbucks.pdfIn PDF document text
    • https://s3.amazonaws.com/sojebelevenex/42529129340.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_off0001a087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A087 5892 bytes
SHA-256: 2bedf6d191d74739bea063a853efd1fdec5d1225812c57f4536f9b946a7f08f7
font_01_sfnt_off0001b483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B483 11088 bytes
SHA-256: a281f410c63c18fef5d7cede25a794e3276d13244d6c105c68eaa440b26ff77b

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