Malicious PDF — malware analysis report

Static analysis result for SHA-256 d95e4f9a12c88b47…

MALICIOUS

PDF

75.2 KB Created: 2020-11-23 12:52:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 00761774837e46c065854f4aece8724d SHA-1: eeac4999a3a82fff6d6295bbf407b1087d4c2206 SHA-256: d95e4f9a12c88b47c57272d4b247bfb3573a98d84dafb93798a5deadf1cccc05
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, suggesting a link farm or redirection scheme, with one primary URL being traffset.ru. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links strongly suggest an attempt to lead users to malicious websites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://traffset.ru/aws?utm_term=bullet+journal+template+good+notes PDF link annotation
    • https://welerenumabo.weebly.com/uploads/1/3/4/4/134467224/029172.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365619/normal_5f87089123345.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375194/normal_5f9f171d27b25.pdfIn PDF document text
    • https://kugodago.weebly.com/uploads/1/3/4/4/134491336/916016.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379984/normal_5fab7ab60733a.pdfIn PDF document text
    • https://fifimijo.weebly.com/uploads/1/3/4/7/134748793/fasebim.pdfIn PDF document text
    • https://wabemogulumog.weebly.com/uploads/1/3/4/3/134384503/4881464.pdfIn PDF document text
    • https://wazuwivanesigov.weebly.com/uploads/1/3/4/4/134431766/nawijes_fifage_dosowosozupuf_wuniwipu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374359/normal_5f8dfb9d0223c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444885/normal_5faa2480b0cea.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/31078695-9f40-47dc-b355-5e939cc2659d/sims_3_law_enforcement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e5d07d0-4885-40b0-b56e-bd5ecb7d5c01/6981165001.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E0 5404 bytes
SHA-256: 3ea3cd319183a93ce247b7541d32d5260bc7229753bf606ed0bfa8e9c5f7f817
font_01_sfnt_off0000d825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD825 2280 bytes
SHA-256: 2ae1575376239567e93ecb1e231089b1ad65a0a5b532a59cddbba84e861f8813
font_02_sfnt_off0000e2ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AE 10896 bytes
SHA-256: e000fdff5127d9ac512ecc9eeeffdff9ae3d2aee28f68aea36419900d7b1d83d
font_03_sfnt_off00010847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10847 16344 bytes
SHA-256: 7e0863d6dcdfe3ce59f67395a06e5e8634226e44f713773c85e494ff6d119ee1

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