Malicious PDF — malware analysis report

Static analysis result for SHA-256 75d679caab2f848e…

MALICIOUS

PDF

89.8 KB Created: 2020-11-20 07:39:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 74263e11e8215f9cbecf75c5d3db9f79 SHA-1: e8444ae861b07c2c636f9f956aef5a848e32bb9c SHA-256: 75d679caab2f848e83a752e1af5285d5ecb94c9cf514dda6dda44b47d5a67914
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a redirector to malicious infrastructure. The document body, though corrupted, suggests a lure related to university admissions. The presence of a link farm and ClamAV detection further supports a malicious classification, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/aws?utm_term=online+admission+form+punjab+university+chandigarh In PDF document text
    • https://muxamaxipusitu.weebly.com/uploads/1/3/4/4/134470051/2929307.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419236/normal_5f9a4a6d0744c.pdfIn PDF document text
    • https://zomomawiwupid.weebly.com/uploads/1/3/4/3/134385308/2f00a52bad.pdfIn PDF document text
    • https://bedusetifimanov.weebly.com/uploads/1/3/4/8/134846759/rofarudazubafu.pdfIn PDF document text
    • https://babikovinemixe.weebly.com/uploads/1/3/1/8/131856339/gusawo.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/70f55011-1fc8-4e57-839b-f22b5556a3d8/fanun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de41f2dc-12c8-42ad-957f-058571d1b009/62774650060.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f09eb9e-0437-455f-9407-d6bf8c3b8516/big_brother_season_18_cast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92236ad6-b4d1-4d75-a90d-eb19e996574e/92215084564.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/257c82fc-a603-4fd7-8c2b-2c64a02d33a2/kunirixurasetefasela.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55913756-4f68-426f-9813-648c178c6092/raz_cuadrada_con_3_fuera_de_raz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c00a0181-069b-4bfa-baac-f5aa06497881/81137125408.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00012aec.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12AEC 26676 bytes
SHA-256: 2f0d41bda2c952af9f22f647c98da138ed779dc10c37c1f48f1920ffe3c0aee2
font_00_sfnt_off0000f073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF073 5972 bytes
SHA-256: e205c6c57188e98e822816830c3d064a629d6a0d3e784bf3bdf1cb090dddc8da
font_01_sfnt_off000104a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A9 11184 bytes
SHA-256: 861bcd588c9ca5d65ff9204cadbe676c27f5fca9664cacd4da3c1bcd907497e8

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