Malicious PDF — malware analysis report

Static analysis result for SHA-256 188bdf6395cda582…

MALICIOUS

PDF

89.6 KB Created: 2021-03-20 03:51:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 2cbb0c3329160b14d3695b27f7d4aaa4 SHA-1: 10f7a04ef88d3faa87a29eb4bc9e2bbaff6f5c84 SHA-256: 188bdf6395cda582f4e6ade7a9da6d1c7357ef337cea139cf587fea3b18680ce
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains or link farms, which is characteristic of phishing or malware distribution campaigns. ClamAV and ML classifiers strongly indicate maliciousness, and the structure suggests it's designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/award?keyword=exercicios+resolvidos+de+tabela+periodica+pdf PDF link annotation
    • https://cdn.sqhk.co/vegedusovo/agjmLjc/midinipefesu.pdfIn PDF document text
    • http://ratedewu.scienceontheweb.net/31017397206.pdfIn PDF document text
    • http://myirn.icu/lawulakivzlrj.pdfIn PDF document text
    • https://cdn.sqhk.co/pavoraxebute/jhghHja/wekawizuputexolid.pdfIn PDF document text
    • https://bonosojemigapa.weebly.com/uploads/1/3/0/7/130776366/zutese.pdfIn PDF document text
    • https://cdn.sqhk.co/givesaxi/heNQBjb/minecraft_diamond_minecart_command.pdfIn PDF document text
    • http://reggis.info/formal_board_meeting_procedures28avk.pdfIn PDF document text
    • https://cdn.sqhk.co/jovakuki/JM2cShh/futip.pdfIn PDF document text
    • http://epaytds.xyz/66429504076jjq00.pdfIn PDF document text
    • https://cdn.sqhk.co/fewoxenovof/h3Ihahi/moxabovetadefogewur.pdfIn PDF document text
    • https://cdn.sqhk.co/toviranevu/3jb9Vid/peacemaker_st_louis_hours.pdfIn PDF document text
    • https://cdn.sqhk.co/jaselavujuwi/CgcRhcj/sakibonajunalose.pdfIn PDF document text
    • https://cdn.sqhk.co/luwivimexu/EhbKjbT/2020_election_ballot_sample.pdfIn PDF document text
    • https://xibupitosuxusi.weebly.com/uploads/1/3/1/3/131380094/f5ed4f86ba3c9d0.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvexudid/ihuRhcG/39147957929.pdfIn PDF document text
    • https://cdn.sqhk.co/wigatozaduw/iJpkyT7/wuduboxazuzalibufuf.pdfIn PDF document text
    • http://zutatowatipo.mywebcommunity.org/panasonic_microwave_oven_grill_inverter.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/db074055-6f3b-4638-b7a8-ff3fe2ac3a1b/tididixivibezifemoxegajuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2043e9e9-dda7-48d7-8c9c-60f37adca2d6/is_manhattan_harder_than_actual_gre.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6706ec6-cc5a-4fe9-a1f6-c29d1db284b4/99687508127.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfe30ac7-b9e8-48a1-8c2f-50570eaa09ab/inkscape_vector_tutorials_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0758a4cd-2435-47c2-9a73-379e11a197f3/6095872989.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_off00011c85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C85 5372 bytes
SHA-256: ba3085a7a67064708c7cfec7caec0367ee448507557f6eac9888b804ea8a7ed3
font_01_sfnt_off00012ee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE3 12996 bytes
SHA-256: a12d83aa7c994bfff9d6fb46367b2a7059cafefce3afbdbf660fecab748d1afa