Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0ae4266a029689e…

MALICIOUS

PDF

77.6 KB Created: 2021-04-05 10:55:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 5b15fa4d60928a567cff041efd8d4968 SHA-1: ced338897b3189529210c3af0a46b3e5fd4ded5d SHA-256: c0ae4266a029689e1611fe9f83e58ff0875910a588458745ecf03381de50f223
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. 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 malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/strik?utm_term=12+steps+to+recovery+lds PDF link annotation
    • http://zimejitudik.iblogger.org/lopepuwusux.pdfIn PDF document text
    • http://lulopoboxefon.scienceontheweb.net/kalnirnay_2020_marathi_calendar_download.pdfIn PDF document text
    • https://cdn.sqhk.co/xodokopav/ggdidjd/mamesiketivemaloru.pdfIn PDF document text
    • https://vukuzimina.weebly.com/uploads/1/3/4/1/134109202/322950.pdfIn PDF document text
    • http://zojekepilawa.iblogger.org/super_hard_mazes_printable.pdfIn PDF document text
    • https://cdn.sqhk.co/buxifuludo/heai1sg/fonekuwimur.pdfIn PDF document text
    • http://fidofawi.medianewsonline.com/effects_of_land_pollution.pdfIn PDF document text
    • https://cdn.sqhk.co/kinuneba/ethdjd7/harvard_business_review_performance_management.pdfIn PDF document text
    • http://rekijiwowak.scienceontheweb.net/41170603909.pdfIn PDF document text
    • https://vonefemupeme.weebly.com/uploads/1/3/5/9/135957005/fojon-zubalipesafum-sasuv-gugiwuxunu.pdfIn PDF document text
    • http://jigavot.iblogger.org/kesulitan_belajar_membaca.pdfIn PDF document text
    • https://rebavunegiluzu.weebly.com/uploads/1/3/4/4/134497465/fajobosa.pdfIn PDF document text
    • https://cdn.sqhk.co/notudubugu/gNzNibH/cheque_book_printing_in_excel_format.pdfIn PDF document text
    • https://cdn.sqhk.co/fixefalid/izhhQjj/9685158541.pdfIn PDF document text
    • http://busapibasin.mypressonline.com/blender_3d_sculpting_tutorial.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fanalejowegop.atwebpages.com/73083393579.pdfIn PDF document text
    • http://zalatikewal.atwebpages.com/jolumezig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1df89cf7-8ff8-4f0a-bc9d-846627e5241e/nordictrack_audiostrider_800_review.pdfIn PDF document text
    • http://xofatodifukox.rf.gd/johnny_b_goode_back_to_the_future_tab_guitar_pro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a930037d-df41-45b7-875e-d531ae067946/49326740345.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_off0000f12b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12B 5108 bytes
SHA-256: 24555dd5babcffd7a5946ca4f0833f465bc2b9251b57f3bc0425484910f15a32
font_01_sfnt_off000102b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B0 11760 bytes
SHA-256: f2454bf1426899d3a1e0c2648a73360e5825cdb71341d6e3fb408af0b7957407