Malicious PDF — malware analysis report

Static analysis result for SHA-256 240f4b90a3deea8e…

MALICIOUS

PDF

69.9 KB Created: 2021-01-28 20:42:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: fcf88588deef0404acf6c8cd7ab8561d SHA-1: 9066ca6f613e445149691f34ec64d194d455f291 SHA-256: 240f4b90a3deea8e32aeadfc0947e5870c85c16de57788cd32a998f77eb33294
156 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 as malicious by a ClamAV signature and an ML classifier. It contains a large number of embedded external links, characteristic of a link farm or SEO manipulation tactic. One of the primary URLs identified is https://leonvi.ru/123?utm_term=uh+manoa+spring+break+2019, which is likely part of the malicious infrastructure. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links suggest an attempt to redirect users to potentially harmful content or phishing sites.

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://leonvi.ru/123?utm_term=uh+manoa+spring+break+2019 PDF link annotation
    • https://nuvisinuxaxo.weebly.com/uploads/1/3/1/3/131383681/2024807.pdfIn PDF document text
    • https://vovowiki.weebly.com/uploads/1/3/2/3/132303124/4468505.pdfIn PDF document text
    • https://dilipifoson.weebly.com/uploads/1/3/1/0/131070096/sutitewemuvezed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409619/normal_5fc97a6b3b70f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465396/normal_5ffed18990448.pdfIn PDF document text
    • https://rofujerejikuf.weebly.com/uploads/1/3/5/3/135388349/sizizimevekifulokubu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412999/normal_5ff1880547f62.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403534/normal_5fcd30e2c66e8.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/wiremeresegikon/18821359181.pdfIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/selokonaw.pdfIn PDF document text
    • https://s3.amazonaws.com/gazitif/72900941856.pdfIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/76876392244.pdfIn PDF document text
    • https://s3.amazonaws.com/mamibis/free_massage_intake_form_template.pdfIn PDF document text
    • https://s3.amazonaws.com/ribowexulo/autocad_2010_crack_dll_files.pdfIn PDF document text
    • https://s3.amazonaws.com/takebemanijewok/mapa_cercanas.pdfIn PDF document text
    • http://tiwemevi.rf.gd/amos_trial_version_free.pdfIn PDF document text
    • https://s3.amazonaws.com/wonumafubij/60509926798.pdfIn PDF document text
    • https://s3.amazonaws.com/fuzafuzeruwit/google_maps_traffic_information.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_off0000d18b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD18B 5876 bytes
SHA-256: fbb063274e9cbac50e88c633c5ff2196d2d597c9d8b2fda1890801efcb9e2d3b
font_01_sfnt_off0000e55b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE55B 10992 bytes
SHA-256: 62b7d02866c395f7b6f2ea410742ce8f24fb2e35bf223ec82f6f3143d24403c2

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