Malicious PDF — malware analysis report

Static analysis result for SHA-256 c566d8017e7bae4d…

MALICIOUS

PDF

79.6 KB Created: 2021-04-05 00:29:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 0d9ea3051358cd3cbd4a558c1c5bfa5b SHA-1: c08e7f3ac5e47fbb8694cc8aa0e7c3194460d908 SHA-256: c566d8017e7bae4d42d2e6550baa3fd9bcb3b0a7f99541a50deae9dc9b335e27
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to direct users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of techniques used to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://mezovuduw.ru/strik?utm_term=how+to+build+a+rocket+stove+with+bricks PDF link annotation
    • https://cdn.sqhk.co/fajoliteve/fhbWWjh/tegovafinezapozi.pdfIn PDF document text
    • https://cdn.sqhk.co/zotofoza/aTjj2vq/jalaluvanoti.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464722/normal_602b61d32e1ee.pdfIn PDF document text
    • https://cdn.sqhk.co/fewisezux/Kjijfii/99283965131.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427268/normal_6035371a01476.pdfIn PDF document text
    • https://bawapumur.weebly.com/uploads/1/3/4/4/134466187/viwiduvonefinu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469103/normal_60583f25c6b6c.pdfIn PDF document text
    • https://sakurulemiba.weebly.com/uploads/1/3/0/9/130969926/kawezom-zuvun-wufijobi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374371/normal_60536a364fc7e.pdfIn PDF document text
    • https://cdn.sqhk.co/kafexobesa/jaUhgeM/37149429451.pdfIn PDF document text
    • https://cdn.sqhk.co/mifigatira/Wjagfgc/69496677426.pdfIn PDF document text
    • https://menanotiji.weebly.com/uploads/1/3/4/3/134322389/ralonirefadunenabeb.pdfIn PDF document text
    • https://dagarodidosuva.weebly.com/uploads/1/3/2/6/132696056/8412606.pdfIn PDF document text
    • https://cdn.sqhk.co/salijuvam/cUjdYhd/coloring_book_image.pdfIn PDF document text
    • https://cdn.sqhk.co/jojojidatun/hLijgca/dragon_war_boom_tycoon_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455390/normal_60303efe475ba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ginixotevu.rf.gd/bhosari_midc_all_company_list.pdfIn PDF document text
    • http://jajoxutevo.epizy.com/computer_science_graduate_resume_template.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_off0000ee6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6A 5344 bytes
SHA-256: a59da344c119c45a4e6456dedf6895ef6bfd84fc2717d1792f6c15016feed8b9
font_01_sfnt_off0001009a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1009A 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off00010927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10927 11184 bytes
SHA-256: 4be6947dbc6ffb5ac1f5887dab1cc109cccdc03741c6abac0e92919f3b4244c8

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