Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b62de7589854ec5…

MALICIOUS

PDF

83.5 KB Created: 2021-04-07 16:11:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 0c4bf45b770c52a31d4e8a5049d367ac SHA-1: 104d6589b3dc6dcd259b99c86e80c430865e4eb2 SHA-256: 9b62de7589854ec5c7809a13f3d275ae44d80d5701a54fd3459bf15117b37792
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. 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 0.9995

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://resalured.ru/strik?utm_term=g+shock+rangeman+9400+black PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4392864/normal_60370e620e056.pdfIn PDF document text
    • http://islandlandscapesbb.com/allotropes_of_carbon_and_their_usesf6sfa.pdfIn PDF document text
    • http://zarumesa.mypressonline.com/pdf_splitter_and_merger_free_software.pdfIn PDF document text
    • https://vajugape.weebly.com/uploads/1/3/4/7/134767319/6203f.pdfIn PDF document text
    • https://zizopozuwugova.weebly.com/uploads/1/3/0/7/130775786/7d063d.pdfIn PDF document text
    • http://centerverifybadge.com/samsung_mobile_year_of_manufacture3ey2f.pdfIn PDF document text
    • https://sujezebaxoxil.weebly.com/uploads/1/3/4/3/134316131/vudemud.pdfIn PDF document text
    • http://3bki.ru/jig_fishing_setup_for_bassigwt7.pdfIn PDF document text
    • https://vuloninufe.weebly.com/uploads/1/3/4/0/134012437/2220602.pdfIn PDF document text
    • https://zomurudol.weebly.com/uploads/1/3/4/4/134492975/jedopodoga-duvirobozoriwej.pdfIn PDF document text
    • https://nimukitu.weebly.com/uploads/1/3/4/2/134266418/9a61843e84.pdfIn PDF document text
    • https://kotezoxeruv.weebly.com/uploads/1/3/5/3/135345651/067b94e168e9dc.pdfIn PDF document text
    • http://pakirekugep.scienceontheweb.net/4th_grade_reading_comprehension_packet.pdfIn PDF document text
    • https://supavutoni.weebly.com/uploads/1/3/4/7/134713891/polifabuwuvatik.pdfIn PDF document text
    • http://esplus.pro/suwegosadosawufasuxe85chv.pdfIn PDF document text
    • http://salleop.xyz/40349331944q424w.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464070/normal_6044bbd78dc4b.pdfIn PDF document text
    • http://jerunuju.mypressonline.com/trough_belt_conveyor_design.pdfIn PDF document text
    • https://fuzakeraza.weebly.com/uploads/1/3/4/8/134848422/3227924.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460982/normal_603732efd7f03.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/gurupixabogivaz/movies_counter_2018_tamil.pdfIn PDF document text
    • https://s3.amazonaws.com/fusopoxipo/all_saints_school_fleet_uniform.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2E 5492 bytes
SHA-256: 677ffcf7c23ff8e034cab04c6c3b41c4f5129d0c50ad4a4337cc003c3c9f83ed
font_01_sfnt_off00010c9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9F 11112 bytes
SHA-256: da88d7716d75edc32df0109f4b5da2bd78be59efb162e242fc3ca2c7e64ffc3e
font_02_sfnt_off000132ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132AB 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333