Malicious PDF — malware analysis report

Static analysis result for SHA-256 4718dc3f4fe73ebc…

MALICIOUS

PDF

77.7 KB Created: 2020-11-22 17:35:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6256c538c21360e13178bb3051c4d99f SHA-1: 11a8c66f6d56caccd2e07216fbbef7446c5b3f43 SHA-256: 4718dc3f4fe73ebc9e50a34e927c32a82545d3d9e7fed9e960a1034112ad062d
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting an attempt to distribute malicious content or engage in phishing. While no scripts were explicitly extracted, the nature of the embedded links and the ClamAV detection point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://cctraff.ru/123?utm_term=nasi+lemak+lover+sponge+cake
    • https://cdn-cms.f-static.net/uploads/4367004/normal_5f94bc3a7c9e6.pdf
    • https://laxuruvu.weebly.com/uploads/1/3/1/4/131482832/8b2901d9.pdf
    • https://kujavubudiza.weebly.com/uploads/1/3/4/4/134497056/ab82979670bca5.pdf
    • https://cdn-cms.f-static.net/uploads/4376611/normal_5f9e4e2458ca0.pdf
    • https://cdn-cms.f-static.net/uploads/4385198/normal_5fad43d43ff6f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.opentle.org
    • https://s3.amazonaws.com/divexikav/71952454281.pdf
    • https://uploads.strikinglycdn.com/files/e93fd0c4-fed3-4a8b-a99e-2e2cbefe6645/epson_workforce_630_manual.pdf
    • https://s3.amazonaws.com/jinabisura/wuwor.pdf
    • https://s3.amazonaws.com/lorifumofelu/pa_doe_license_availability.pdf
    • https://s3.amazonaws.com/joterige/10609751428.pdf
    • https://s3.amazonaws.com/tinezedu/lentiform_nucleus_function.pdf
    • https://s3.amazonaws.com/felasorarabipis/benim_hocam_tyt_tarih_ders_notlar.pdf
    • https://uploads.strikinglycdn.com/files/45e8c7dc-d125-4d42-9586-337e6c9f0d5f/32759752767.pdf
    • https://uploads.strikinglycdn.com/files/d210f018-2127-4b14-bcf7-abc0c384b668/morufagazitolexasefarimov.pdf
    • https://uploads.strikinglycdn.com/files/6a08089e-9d52-4c7e-b434-7ab5bccf2497/monsieur_ibrahim_et_les_fleurs_du_co.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://www.gnu.org/licenses/gpl.html

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfdf.bin
3e48659b41b62f8e2a0b52557306a8573b719d6c465057a79661ea92d413bb11		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFDF 5500 bytes
font_01_sfnt_off0000e2ce.bin
f5afddbb9a64454f4c8f486da41e4c4657d84e0b86d41a8ffec502aaa2de8bd2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CE 5348 bytes
font_02_sfnt_off0000f4eb.bin
d2d10b6b0c668cf26faa9347c7054f8580c7eefa5cb7aecda2a4fba74bd025f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EB 6068 bytes
font_03_sfnt_off0001049c.bin
296e10345e920fe87969e37a591ad3d238b02f3edb4d7769381b4c4a43a1cf36		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1049C 10528 bytes

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