Malicious PDF — malware analysis report

Static analysis result for SHA-256 8677ace63affac34…

MALICIOUS

PDF

81.5 KB Created: 2021-04-17 07:46:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 4cdeba18acd16e572a2211d2cf96a052 SHA-1: b007c3d73e1c6cf3377f2bb22321319211128d3e SHA-256: 8677ace63affac342192884eebe5ee703e529909987e38d471e3d019670af0db
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to disposable hosting or known malicious redirectors. The primary function appears to be directing users to external, potentially harmful, websites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=what+type+of+engine+does+a+toyota+corolla+have In PDF document text
    • https://fobinoxibenor.weebly.com/uploads/1/3/1/4/131437242/1071200.pdfIn PDF document text
    • http://goldstein.capital/cara_reset_toner_brother_dcp_l2540dw9oe80.pdfIn PDF document text
    • https://renezotutumiw.weebly.com/uploads/1/3/5/3/135343322/jadumixorak-wunevevibe.pdfIn PDF document text
    • https://sixuvowapunara.weebly.com/uploads/1/3/0/7/130738553/miruna-fisemowukofila.pdfIn PDF document text
    • https://wojewifonutej.weebly.com/uploads/1/3/4/8/134883442/7786818.pdfIn PDF document text
    • https://migigazafakag.weebly.com/uploads/1/3/4/3/134377970/81d372.pdfIn PDF document text
    • http://liwonixaxe.iblogger.org/bujavogekav.pdfIn PDF document text
    • http://nuzenurego.22web.org/wozizugevubaxarasizoxosa.pdfIn PDF document text
    • https://nosugorowemuz.weebly.com/uploads/1/3/5/3/135327492/2739727e49ec.pdfIn PDF document text
    • https://famofupogatom.weebly.com/uploads/1/3/0/7/130739443/2e7c2ce906.pdfIn PDF document text
    • http://storeyou.store/peo_model_occupational_therapy_case_studybi45l.pdfIn PDF document text
    • http://tafasizogir.22web.org/stand_alone_definition_in_spanish.pdfIn PDF document text
    • http://xawaviki.iblogger.org/upsc_cds_2020_syllabus.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
    • http://gawibij.epizy.com/2018_toyota_camry_le_interior_lights.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19c9a29f-ed3d-4f2f-8f0e-164bbca18210/heating_ventilating_and_air_conditioning_analysis_and_design_6th_ed.pdfIn PDF document text
    • http://ninonasoligu.rf.gd/noxiradovabexarivolafak.pdfIn PDF document text
    • http://mifavumiz.rf.gd/pentair_fns_plus_60.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24ca249e-f665-44fe-8e18-f747b63de54b/how_to_join_special_operations_engineer_regiment.pdfIn PDF document text
    • http://xiriwut.epizy.com/criteria_of_good_research.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c764d99-1c95-46bb-b022-1a54e4ac24ac/the_sign_of_four_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59262015-d93f-44d5-b9b7-d690ae7e01be/vepeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6584ee40-af01-4368-b1e8-b33679988576/vamipitobidenajenumazonom.pdfIn PDF document text
    • http://sozijajetazojuk.epizy.com/armenian_script.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_off0000f141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF141 5380 bytes
SHA-256: 345bcc5af5b219f02f8c9c0e001b171d1347a8ded77159a18c8417ab6c83916d
font_01_sfnt_off000103a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A3 11156 bytes
SHA-256: 6fbc199c28ddafab7ea58a863cef35592aa5bf4effec7642d111f183a5b6a4ee
font_02_sfnt_off0001298f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1298F 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230