Malicious PDF — malware analysis report

Static analysis result for SHA-256 78af22aaf49944c0…

MALICIOUS

PDF

77.4 KB Created: 2021-03-14 18:06:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 6e8794e3afa4fc1689a133d6a3f3236d SHA-1: 0ca4b56c3325da7346e221f3556ccee8600017d7 SHA-256: 78af22aaf49944c00d46b650f8ec3945e0d02cc0a1688bf98c861a7c7a67560e
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous embedded URLs point towards a malicious document designed to exploit users through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://resalured.ru/wix?keyword=hilti+pd4+manual PDF link annotation
    • https://romudakon.weebly.com/uploads/1/3/5/3/135318284/wesokekawibavep-raxaje.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499972/normal_60095d738853c.pdfIn PDF document text
    • https://pememeva.weebly.com/uploads/1/3/0/8/130874233/ledusevudeje.pdfIn PDF document text
    • http://subuxiwubemew.getenjoyment.net/biochemistry_and_clinical_pathology_book_download.pdfIn PDF document text
    • http://cartest.pro/create_gaming_logo_templater09mg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481424/normal_600b6f186706d.pdfIn PDF document text
    • https://zozutogumudeke.weebly.com/uploads/1/3/4/4/134440166/tevefekiwixur.pdfIn PDF document text
    • https://gekubunog.weebly.com/uploads/1/3/4/2/134235395/c15a054.pdfIn PDF document text
    • https://zilibadokaji.weebly.com/uploads/1/3/2/6/132680781/xutabilesalu_tuzexurumadugu_tobeb.pdfIn PDF document text
    • http://winoraama.space/tomb_raider_cosplay_guidey8m5f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402938/normal_6036168fe013e.pdfIn PDF document text
    • http://lexamopelezun.mywebcommunity.org/cardiac_conduction_system_pathway.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451930/normal_6026fad007e83.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404502/normal_5fe30e524b8d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466666/normal_602380f81b0b3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379233/normal_5ff675f5c476d.pdfIn PDF document text
    • http://cardioactiveuficiale.site/focusrite_saffire_pro_24_drivers5w919.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369654/normal_5fd320e23f81e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453563/normal_600b0ff1b9ef2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404497/normal_602990cfbdb53.pdfIn PDF document text
    • http://lebepufu.mypressonline.com/charles_dickens_a_christmas_carol_short_story.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://liroporuki.myartsonline.com/aircare_humidifier_error_code_ec.pdfIn PDF document text
    • http://xanedemu.onlinewebshop.net/battlestar_galactica_starship_battles_rules.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_off0000f34c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34C 4880 bytes
SHA-256: c6870037e05ebeb21567ffd6ef1251b575573d3993d737636483e63f4a95b9bb
font_01_sfnt_off000103d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D2 10680 bytes
SHA-256: cf96c3ae109bb97206b3d45b4710f9a29587b9847a036b03cc01b3c352fd56e9