Malicious PDF — malware analysis report

Static analysis result for SHA-256 38ecedaf0c4578ca…

MALICIOUS

PDF

69.9 KB Created: 2021-02-14 02:56:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 2d8e81f29db3bb5bd70eeac4e289dd39 SHA-1: 4b6746ed268bc129f5dac73764a1334fbd0a4521 SHA-256: 38ecedaf0c4578ca062f737157793408b6a6a47d47f35a1aa1e3038972926de4
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links pointing to various domains, many of which appear to be disposable hosting. This behavior is indicative of a link farm, often used for SEO manipulation or to distribute malicious payloads. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

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
  • 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.
  • 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://seumenha.ru/wb?keyword=android%20become%20human%20review PDF link annotation
    • https://ginugifugebiner.weebly.com/uploads/1/3/4/2/134234672/folegirodudabufaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485015/normal_601ed4fde5891.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459629/normal_600ed36861b22.pdfIn PDF document text
    • http://virnet77.ru/tefabkwxy6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380210/normal_6008fcfd069fc.pdfIn PDF document text
    • https://verosogoteri.weebly.com/uploads/1/3/4/7/134738646/a89368.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374520/normal_5fdbd67bf31b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383695/normal_5fd7eaf429b6e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450864/normal_5fd218f52fb73.pdfIn PDF document text
    • https://lafajadisevo.weebly.com/uploads/1/3/1/4/131454770/giwoliwa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369922/normal_5fe24c39367ec.pdfIn PDF document text
    • http://sodahub.pro/wezol06c0c.pdfIn PDF document text
    • http://vir-tus.com/business_studies_grade_12_study_guiden7zkf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366364/normal_5ff76410855a0.pdfIn PDF document text
    • http://getcabinets.xyz/confluence_create_site_templateodp18.pdfIn PDF document text
    • http://sweetmeet.online/press_your_luck_host_elizabeth_banks2iqur.pdfIn PDF document text
    • http://ig-copyrightnotice.com/80s_music_artists_female3i4wu.pdfIn PDF document text
    • https://cdn.sqhk.co/netimawifes/gcxjbGx/86114400154.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD530 5248 bytes
SHA-256: c898b4dafd4c67a4137a507dc6d861c5084255f92150e645ff9c45fd53adff99
font_01_sfnt_off0000e6ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EF 10664 bytes
SHA-256: 15dc0cd31505189816c5c20e83e9ef7b496baa016a12347f923d0fbf081a3501

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