Malicious PDF — malware analysis report

Static analysis result for SHA-256 01b8a1e080da363a…

MALICIOUS

PDF

70.1 KB Created: 2020-11-25 07:56:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: e53d5e3bbe4e09b8b3d651d76a61f2a8 SHA-1: 7b3ccf9feefb6149611347017fc84f516cf1560c SHA-256: 01b8a1e080da363a10ecfbb4addfc05731fe1c839ba406f2e07503fddb3b9611
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM'. The primary malicious URL, 'https://traffset.ru/strik?utm_term=catholic+church+wedding+ceremony+vows', suggests a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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/strik?utm_term=catholic+church+wedding+ceremony+vows PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4373301/normal_5f920705604d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407983/normal_5f953c1ef1d19.pdfIn PDF document text
    • https://rolosakuzorega.weebly.com/uploads/1/3/1/3/131379035/pupowakumug.pdfIn PDF document text
    • https://kesamitowusiniw.weebly.com/uploads/1/3/4/4/134441112/zotudolubezoj.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/21cd4a75-0dfe-4c72-8945-8800ff2c5ab8/wivuwe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05fb0888-a45e-429d-9382-688d31f59221/2264960328.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e8a1607-9f0f-4c7b-bfcc-e913d7814a08/34812591815.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7b1276a-daba-43a2-b4e3-e67d544d0a3b/nau_2019-20_academic_calendar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb656094-5c00-4005-abed-516b6ae3dba8/72561147604.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f26fb6aa-c7ab-4ec3-8d0c-1f95471eb54e/xarazumikugoxofisu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/443a11d9-1486-457f-b3ff-6018aa72788f/jezajebejixiwinoludog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfe412c9-0dd7-4d4f-b0da-cfaf84fcae86/lenovo_z710_i7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e3a9127-9a94-4a01-b39f-909a9835cccc/danuke.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_off0000d45f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD45F 5512 bytes
SHA-256: 658fb41989e28a558f058af4d36219d289b71aff0e97969b4ef9ecf9ac93ccc3
font_01_sfnt_off0000e70b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE70B 10768 bytes
SHA-256: eebfd593e1339d4f2d251f96eafdc959e4971be448abcfb9a1566e8753e65a5b

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