Malicious PDF — malware analysis report

Static analysis result for SHA-256 c409d0eb4f8bf6d0…

MALICIOUS

PDF

76.6 KB Created: 2021-05-16 23:02:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 43ed588cbf6b5ba4d2afc70f10a03900 SHA-1: 03fe8ed18312eeea2f6a8df4b6081405c61cee71 SHA-256: c409d0eb4f8bf6d0268b146a18510d37dedf2ae4f47e6f9c48ba250765d2d38f
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 pointing to disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://nipisod.ru/strik?utm_term=matlab+for+control+engineers+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4393900/normal_600080a7539b2.pdfIn PDF document text
    • https://cdn.sqhk.co/rokatodupi/jbBuTHD/foot_locker_customer_service_online.pdfIn PDF document text
    • https://cdn.sqhk.co/sexasegavon/jphaU3u/app_radio_for_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/jawutuwek/gjfiiRt/75387116393.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499023/normal_6008f7ff6a915.pdfIn PDF document text
    • https://barijenevedi.weebly.com/uploads/1/3/1/4/131438420/negebuvivej-xalekab-bexuxugemuluwe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418166/normal_5ff3a3a83e7ce.pdfIn PDF document text
    • https://cdn.sqhk.co/xavipinav/ihjfgfk/disarm_gnome_bombs_fortnite.pdfIn PDF document text
    • http://lukezelulevuf.22web.org/82040583429.pdfIn PDF document text
    • http://xonesasa.iblogger.org/the_lord_of_the_rings_movie_collection.pdfIn PDF document text
    • https://bopojebokup.weebly.com/uploads/1/3/1/4/131408204/0e0e7b7cddc96.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450145/normal_6054e9d87c892.pdfIn PDF document text
    • https://verumoxozuvije.weebly.com/uploads/1/3/1/4/131407377/80bd55b81015.pdfIn PDF document text
    • https://goginaderexikez.weebly.com/uploads/1/3/5/3/135306094/60edfc.pdfIn PDF document text
    • https://jobalexaxikut.weebly.com/uploads/1/3/4/8/134892204/3134910.pdfIn PDF document text
    • https://cdn.sqhk.co/mesirunomi/2jg8TFe/mijn_umc_zorgverzekering_app.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393890/normal_600e440c2650f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cf075d60-af7c-4c71-a16c-5c8c125a9bb7.filesusr.com/ugd/cc03df_408b38707dfc4a4d8d8071d659163eb3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fukezavazuj/python_kivy_android_app_example.pdfIn PDF document text
    • https://ee897e78-a157-4eb5-8a47-d615096087a2.filesusr.com/ugd/113e89_01df2e75b7a34aea8c7d00e0bd9299e4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xoxaneral/24850761670.pdfIn PDF document text
    • https://s3.amazonaws.com/jutenojamega/saropolonosubate.pdfIn PDF document text
    • http://bitezopunofiwu.rf.gd/the_semitic_languages_an_international_handbook.pdfIn PDF document text
    • https://d6236f05-450e-4b96-9875-1783d83c708b.filesusr.com/ugd/912de2_d5e465221a6e404a9977daa0476dc968.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/magapeguwabe/10816830208.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCB 5468 bytes
SHA-256: 68898d129e2b7af917336ea0fd82ac700386aefa6fa536bab04024915a99c97e
font_01_sfnt_off0000ff79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF79 11040 bytes
SHA-256: d06aa5a67d988f95af73d36afed5797128b53df6420b60473937931aef35ab19