Malicious PDF — malware analysis report

Static analysis result for SHA-256 caac88d6589faa0f…

MALICIOUS

PDF

83.3 KB Created: 2021-05-09 14:09:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: ba8395dda5391f9e42a8438a7220c632 SHA-1: d2180275fe7547fce415df1a6a3f698c0746afa9 SHA-256: caac88d6589faa0f353e88481092835ff41fbd1f32113e8221b729d0106578f4
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to disposable hosting services, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to lead users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://jacksth.ru/strik?utm_term=sql+developer+tutorial+beginner+pdf PDF link annotation
    • https://lisevududotuwak.weebly.com/uploads/1/3/4/2/134265384/98a5fbbce.pdfIn PDF document text
    • http://gazzsheff.xyz/861033382481wq1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388416/normal_60102dcd93697.pdfIn PDF document text
    • https://golewobewawir.weebly.com/uploads/1/3/4/3/134350879/betofone_pelukizef_zidevaziruv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402478/normal_5fcc3c222c17d.pdfIn PDF document text
    • http://busivel.xyz/369866491036sjp2.pdfIn PDF document text
    • https://ragurinibobuma.weebly.com/uploads/1/3/3/9/133986244/1922050.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402481/normal_5fd949f5b84a7.pdfIn PDF document text
    • https://turonobofudub.weebly.com/uploads/1/3/4/4/134463989/zonogig-kepiw-binefapew-jalulovizuxeja.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413363/normal_6066f637a7665.pdfIn PDF document text
    • http://nonretloli.site/6590019438wxjhq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468836/normal_6016ebd0812b3.pdfIn PDF document text
    • http://chambre.xyz/palabras_agudas_llanas_y_esdrujulas_ejercicios5en1h.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c73e0f7-42e8-4c50-8633-da8eeab78382/xazazetikigelikevi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/000f5a5b-b92b-4abf-9f6a-d2f193820e39/florence_scovel_shinn_love_quotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d153da59-4fb5-4a6c-b941-7b28b27d60e8/defakofamuwuxagefekewa.pdfIn PDF document text
    • http://tuvugerij.rf.gd/farmakokinetik_atropin_sulfat.pdfIn PDF document text
    • http://kojavigetizafi.epizy.com/chuyn_sang_file_nh.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a98aa127-66fc-42b9-819e-046473cf2672/poxogesoradizozeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e22e062a-177a-40a6-a44d-a226330fc771/the_reason_why_is_that_or_because.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3bb73b0-1169-4499-ae21-617db6612d1e/english_grammar_book_in_gujarati.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fd81f75-6dd9-4f9e-a83e-4f9688f07560/pegatron_a15_motherboard_bios_update.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF364 5460 bytes
SHA-256: b0fce37d2dc81d860751613452ec047f9fdc35c87b677de1e7cc7ca8db57dc4a
font_01_sfnt_off00010601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10601 10484 bytes
SHA-256: f4b0bffd0cd5129ebbefe9d76a6f4bdc957b47d4668a48027760fb24a79392b8
font_02_sfnt_off000129ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129EF 16312 bytes
SHA-256: 975089639afea594160f6daa1ae948ffc4125994d61a9fd32dce02580f7b6b15