Malicious PDF — malware analysis report

Static analysis result for SHA-256 c621b3b3d1b19e38…

MALICIOUS

PDF

68.1 KB Created: 2021-01-13 07:58:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 30da6f230ae31135949457b39bff6576 SHA-1: 3da94187721abde0d6e022252f4cdae342db4bcc SHA-256: c621b3b3d1b19e38fadba28a99183ae48b3808e1450994df342f099c0a58a1ff
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains a large number of embedded links, many of which point to disposable hosting services and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for SEO manipulation or to distribute further malware. The primary attack pattern involves directing users to external, potentially malicious, content through a network of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://traffmen.ru/wb?keyword=coffee%20shop%203d%20design In PDF document text
    • https://kisuguwaki.weebly.com/uploads/1/3/4/3/134388310/f41e6.pdfIn PDF document text
    • https://site-1177370.mozfiles.com/files/1177370/tawoki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420588/normal_5fd7a36ee2a59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407087/normal_5faae738812c4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402246/normal_5ffc472b8875c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425501/normal_5fd1bc080c727.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493569/normal_5fb2beef1fba5.pdfIn PDF document text
    • https://bewejagaseti.weebly.com/uploads/1/3/4/7/134708857/6158395.pdfIn PDF document text
    • https://komuwewolidixat.weebly.com/uploads/1/3/4/8/134871085/gapalazef_guwafapigefep_newome_zibarer.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467285/normal_5fcd0bff2115c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391305/normal_5fad9dddef1ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461777/normal_5fb2e7093a770.pdfIn PDF document text
    • https://nebowepef.weebly.com/uploads/1/3/4/4/134483035/jugoxabigewiga.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411916/normal_5fea2c1920f19.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/fizup/vumawegozetuz.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c0ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0EF 3500 bytes
SHA-256: 0cd1f81ae9606114159e6babfc565978bfa17c1008561a08030f1bc7529b5ed6
font_01_sfnt_off0000cd99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD99 5036 bytes
SHA-256: cda57700258d62e1dd0b6fe37fa851e91759ac7775bfe7d42dbafa8b8c219eae
font_02_sfnt_off0000dec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC4 11492 bytes
SHA-256: a98425f476984bdc320270465affc8760c285eebfa350c92768e3377cf9dfa6a

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