Malicious PDF — malware analysis report

Static analysis result for SHA-256 b02bca2750f133b1…

MALICIOUS

PDF

71.9 KB Created: 2021-06-07 07:31:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: cffaccc794a84a924cedd4cfea8267af SHA-1: eb96e95a00c84ae9d94ae249607d82d8b209124f SHA-256: b02bca2750f133b15002cb0ec8de933df0b6093ae18f8d71d3792d8d94b74250
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://smidgel.ru/pbw?utm_term=bowmasters+diamond+membership+apk PDF link annotation
    • https://bezodidamivozel.weebly.com/uploads/1/3/2/6/132683328/jifaratulebove_wugemo_sezanuxekir.pdfIn PDF document text
    • https://sosubewuwebefa.weebly.com/uploads/1/3/4/3/134360265/3416711.pdfIn PDF document text
    • https://nirawulef.weebly.com/uploads/1/3/4/3/134324477/7374745.pdfIn PDF document text
    • https://kogewovedof.weebly.com/uploads/1/3/4/3/134339257/femenizemiw_nasevukito_losomixasasez.pdfIn PDF document text
    • https://pilumana.weebly.com/uploads/1/3/2/6/132683063/tijabinirujimiwif.pdfIn PDF document text
    • https://lesidodulutenem.weebly.com/uploads/1/3/4/3/134352412/3408180.pdfIn PDF document text
    • https://buxexuwuf.weebly.com/uploads/1/3/4/6/134660927/9519264.pdfIn PDF document text
    • https://wilepojaxuxag.weebly.com/uploads/1/3/4/6/134682450/pagokuvavafujilixex.pdfIn PDF document text
    • https://xadebunurag.weebly.com/uploads/1/3/1/4/131454816/8137582.pdfIn PDF document text
    • https://benarejara.weebly.com/uploads/1/3/1/4/131407695/1148317.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/40c43cc8-01f1-43a1-b77b-a68dc12d36d3/48260953460.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1cc8310-9d80-417f-b097-c7a9237f92a8/lafatefufivuluzipakigazup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad44adf6-0efd-402d-aa3a-1c5043ffb0cd/mepawalarinuxuboboluvipit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffb45ddd-5f22-4160-bc3e-b87dcd331937/20444894927.pdfIn PDF document text
    • http://fepewuwakow.pbworks.com/f/when_was_the_first_jail.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07e8326b-add0-41b3-bf21-935a4c4358df/imveis_cachoeira_do_bom_jesus_florianpolis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a04f7c50-5837-4e98-9519-a88bf8663c16/fekemafavotovowafura.pdfIn PDF document text
    • http://jolowajuwijo.pbworks.com/f/52324176765.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3ddb4f5-cbfa-4b8d-ad9e-a66877de5152/83273561530.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_off0000daa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA5 5512 bytes
SHA-256: 48dd0001cb5ec9475136733bf7220a269fea7ca6b7895ab8867dfafe76c8b737
font_01_sfnt_off0000ed3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3D 10980 bytes
SHA-256: 4faa98ffc7aa5e29b6b4e5e1de88d0eceab55f7d057dc53bd15731b8385b325b