Malicious PDF — malware analysis report

Static analysis result for SHA-256 559bfafa7e03f1fd…

MALICIOUS

PDF

73.4 KB Created: 2021-05-13 22:20:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4428bc4a5d2bb429f65505d83a51201d SHA-1: c6b018605f8a42372a13aa88aadbfb32a08cc9f2 SHA-256: 559bfafa7e03f1fd7a3f7daa7ab2269f35f6c9d72aa0b028b6236cef3cf44658
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 0.9993

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://midufefew.ru/strik?utm_term=what+is+the+salary+for+a+criminal+lawyer PDF link annotation
    • https://tulixepatezapik.weebly.com/uploads/1/3/4/9/134902644/topojoliv-tudakadimoniri-rokogebe.pdfIn PDF document text
    • http://wejewirivi.iblogger.org/37226236422.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421350/normal_604ba3fcdc752.pdfIn PDF document text
    • http://dihtyar.online/nepazutulukatuzahtxa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409806/normal_5fe84b63e5b63.pdfIn PDF document text
    • https://buvedanazifom.weebly.com/uploads/1/3/4/8/134876279/3855338.pdfIn PDF document text
    • https://virigegeke.weebly.com/uploads/1/3/2/7/132740897/miravowiduzufalijaze.pdfIn PDF document text
    • https://vepodiruwa.weebly.com/uploads/1/3/4/3/134374194/bazojij_wedubinafoti_newavas.pdfIn PDF document text
    • https://fowaloxew.weebly.com/uploads/1/3/4/8/134881160/1630742.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412599/normal_5fc70e27bc64f.pdfIn PDF document text
    • http://lady-bug.club/27032016057sg32s.pdfIn PDF document text
    • http://rumukisizupew.iblogger.org/fosukigipiruna.pdfIn PDF document text
    • http://datab.vip/tunuwapimawuburorvffvc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458394/normal_5ffcd9ff3a699.pdfIn PDF document text
    • http://g2am2e.xyz/balancing_chemical_equations_cheat_sheetwikqi.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/3856517a-3026-4603-bf33-e3182b91de5b/how_do_you_remember_resistor_color_codes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a5b1285-dd69-431b-9a58-ed9f6c21addc/40586934899.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d193574-0f26-475f-8e3a-eabf477c6dc2/maytag_neptune_washer_fault_code_nd.pdfIn PDF document text
    • http://bagozorox.rf.gd/aamc_application.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91ecdf3b-a333-4f6f-b57d-ce5da2fea3f6/90066606809.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b53babd3-b952-4165-8c67-14ac12ee5561/48717162564.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0afb034b-48b1-4853-8a49-d032a2a2296a/gogekudubiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f99b737-83b7-4afc-adda-4f45e533d444/pisasosobenade.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_off0000e2b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B0 5328 bytes
SHA-256: 4da0d80fba15dfbd91e132a0d3eab998b71488631543f7b800da42c71145e26f
font_01_sfnt_off0000f4be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BE 10428 bytes
SHA-256: a47db818478d4eade0b7d883f9d5e20a01d52e97243164946383db178dbdebc3