Malicious PDF — malware analysis report

Static analysis result for SHA-256 533671e33264b70c…

MALICIOUS

PDF

65.5 KB Created: 2020-11-13 11:42:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 3e70735f7fc898ed2272495d1f015c28 SHA-1: 77a2fc555e13ae7c0f310bfd5b35f34cf85a055a SHA-256: 533671e33264b70c653445cb09822f838d3da476be05dea160458d039ddb5cec
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links to other PDF documents, forming a link farm. One of these links, 'https://traffking.ru/strik?utm_term=ioi+standby+ep+3', is known to lead to malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

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://traffking.ru/strik?utm_term=ioi+standby+ep+3 In PDF document text
    • https://sijevunima.weebly.com/uploads/1/3/1/8/131859613/zikeg-dezurol-ritusife.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420764/normal_5fa2a4199afa8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393348/normal_5fa7601d5a2cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383444/normal_5fa12adcc8090.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373281/normal_5fae4dbac1f33.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/zabevog/medaniworak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/faee3da5-8793-4c96-84e5-184276b2c87d/68150989917.pdfIn PDF document text
    • https://s3.amazonaws.com/jusuberu/wukoralowajuwelipojem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfa83b4c-46b9-4cb4-9c56-8f2413226547/jamasopetike.pdfIn PDF document text
    • https://s3.amazonaws.com/ragejufa/tutuvutuliporobaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70ed21f1-2df8-4e88-8a94-ea98fe0f66aa/stickman_2_unblocked_games.pdfIn PDF document text
    • https://s3.amazonaws.com/zurovajij/mark_ronson_uptown_funk_download_video.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000abd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABD7 5168 bytes
SHA-256: 70c6579a96be8a5a896df0ed3a0a09625e1ce744a40eda11065b709d3d370fad
font_01_sfnt_off0000bd7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD7E 10928 bytes
SHA-256: 5bf194b7c11d277eff9a40a7213ce31f594a303f6086b4f34c4ca0ad7dcae738
font_02_sfnt_off0000e267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE267 16204 bytes
SHA-256: 514ec34c774379c82780ce3b826aceada3291152a2a4734d997485cf707bbc49

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