Malicious PDF — malware analysis report

Static analysis result for SHA-256 027525caa8786b7f…

MALICIOUS

PDF

91.3 KB Created: 2020-12-25 10:12:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 552421e518dcf17af403620b8d8fca23 SHA-1: 7c8ce62c535962cc286ca7c049ade395dfdb138f SHA-256: 027525caa8786b7fe9bf8312e4dea6b4d5063748804a5a88868f5e13cbb82ea6
244 Risk Score

Malware Insights

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

The PDF document was identified as malicious by multiple heuristics and a machine learning classifier, specifically flagging it as a redirector link and a link farm. The document contains numerous embedded URLs, many pointing to disposable hosting services like Weebly, suggesting an attempt to obscure the ultimate destination. The presence of a link to known malicious infrastructure further supports this. While no scripts were explicitly extracted, the nature of the embedded links and the ClamAV detection indicate a phishing or redirection attempt, likely leading to a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/aws?utm_term=a+brilliant+young+mind+subtitles In PDF document text
    • https://viweposedijul.weebly.com/uploads/1/3/1/0/131070314/18dff49.pdfIn PDF document text
    • https://pebabole.weebly.com/uploads/1/3/4/6/134698512/julonisaf-votavo.pdfIn PDF document text
    • https://cdn.sqhk.co/dozirolizilu/ibRwihs/yellowstone_cast_season_2_episode_4.pdfIn PDF document text
    • https://cdn.sqhk.co/wotutovebo/S7JfB9u/govobefutarasine.pdfIn PDF document text
    • https://xoretewajojuso.weebly.com/uploads/1/3/4/4/134474148/tatejigidisom.pdfIn PDF document text
    • https://veraweno.weebly.com/uploads/1/3/0/7/130739577/dudurojasav.pdfIn PDF document text
    • https://gabopubowiton.weebly.com/uploads/1/3/4/5/134596717/4711435.pdfIn PDF document text
    • https://cdn.sqhk.co/bubarozotuj/Xjc1jjf/nick_carter_dancing_with_the_stars_week_11.pdfIn PDF document text
    • https://rajulotopeza.weebly.com/uploads/1/3/4/6/134665566/xivurimor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481662/normal_5fd29d6a6650f.pdfIn PDF document text
    • https://fotejisatowonu.weebly.com/uploads/1/3/2/3/132302873/vuzilulipavu.pdfIn PDF document text
    • https://fenulibamale.weebly.com/uploads/1/3/4/6/134601409/bee9c0be13bd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.indictrans.orgIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e658d42-9176-4582-93fa-6302b329702f/69398911987.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1caeafa1-858f-4cf3-afc3-c515097ba8ad/planificacion_estrategica_de_una_emp.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://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 8

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8DF 5376 bytes
SHA-256: 678a46767a22f8e7e5701558285aa14989eb168fd4b7ed40c912112d5f40b9e6
font_01_sfnt_off0000db0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0F 4140 bytes
SHA-256: 2a2f73c0ee504ae8509221dab9a50e72e6c400a18e3952d3eee660ba18a0c3b1
font_02_sfnt_off0000e834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE834 2328 bytes
SHA-256: 18b250f24057ce91e4a59b25c1eec79fa8b4d7e2cb9f6c0de02c7e032a072fd4
font_03_sfnt_off0000f2eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EB 2604 bytes
SHA-256: 5fd53e2058c4f5d98b70161d670f1e42036942552fef68ac845a5e47e2d7f715
font_04_sfnt_off0000fe0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0B 4336 bytes
SHA-256: 87016e8933cc862d1d188edfbee698abcff8178ed3d6b510b61737ee02f60284
font_05_sfnt_off00010bac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAC 16420 bytes
SHA-256: a2a7fab7ca98f4e0c31570a3ba6483b5540baee556411778eb4b75a8061be906
font_06_sfnt_off00013b6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B6A 16236 bytes
SHA-256: c79d11e2724693f940616cddd091f9c2b18cd24ba83ed01dc10c14b552a51693
font_07_sfnt_off00015118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15118 2704 bytes
SHA-256: 0050349814d8658bed5856405982d73d43414675a208a2a55cd2b58c9d6303ed

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