Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f783543d328de86…

MALICIOUS

PDF

76.0 KB Created: 2021-01-28 13:42:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 0466caee178f60fd3c33fb1996e979e4 SHA-1: 30c692ffb0cc69f58a1bce83aeba6f5894e053e3 SHA-256: 5f783543d328de8641bbc280f2d6d10b78194d0aa2fa13f2781ed3e0092e2ab1
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 redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs and the heuristic findings of a 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' point to an attempt to drive traffic 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://traffset.ru/wb?keyword=logo%20maker%202019%203d%20pro%20apk PDF link annotation
    • http://eferevole.com/tumblr_page_viewercsk50.pdfIn PDF document text
    • http://unlockdeals.shop/92856738626lopei.pdfIn PDF document text
    • https://vefutafefu.weebly.com/uploads/1/3/4/8/134882527/15072.pdfIn PDF document text
    • https://cdn.sqhk.co/vovewotutal/jgzhg21/british_indoor_rowing_championships_2019_results.pdfIn PDF document text
    • http://uaportal.site/powuwwh658.pdfIn PDF document text
    • https://ritosigom.weebly.com/uploads/1/3/1/4/131453630/dosono.pdfIn PDF document text
    • https://fofifakexetag.weebly.com/uploads/1/3/4/3/134345684/920546.pdfIn PDF document text
    • https://rubosesizip.weebly.com/uploads/1/3/4/7/134744628/928fc152cde1.pdfIn PDF document text
    • http://potolkilife.ru/applied_groundwater_modellinguamol.pdfIn PDF document text
    • https://cdn.sqhk.co/tojebaru/YwRGgd3/pitunediwufiduninuf.pdfIn PDF document text
    • http://distornyup.site/photographic_atlas_for_anatomy_physiologybwhhq.pdfIn PDF document text
    • https://koruguliduni.weebly.com/uploads/1/3/4/8/134896859/8938bda7e3b.pdfIn PDF document text
    • https://cdn.sqhk.co/monasomeb/jhWAjg7/masterchef_nascar_finish_line_feed.pdfIn PDF document text
    • https://mobinefoju.weebly.com/uploads/1/3/1/3/131398425/kuvefuxukafasi.pdfIn PDF document text
    • http://safetymirrors.xyz/91e4g.pdfIn PDF document text
    • https://nelajelax.weebly.com/uploads/1/3/2/7/132712676/8c5340ed016.pdfIn PDF document text
    • https://cdn.sqhk.co/febutatesu/jbgihje/39143199970.pdfIn PDF document text
    • https://tuvopezape.weebly.com/uploads/1/3/4/7/134712323/magokodebom-dasimoruk.pdfIn PDF document text
    • http://abwaab.su/wutiwusawobolatelepetsifa.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_off0000e5a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A1 5720 bytes
SHA-256: 4d87aa8caf9f556302aa09d0a6056501a0af12d50ecfe2b6094bc4bebb2897a3
font_01_sfnt_off0000f90c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90C 12764 bytes
SHA-256: da0f3bf75cd846593a5ab177a94e49b045b769ff93a6ce3249508a3ce3e175ab

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