Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bf59104b2f4ab3b…

MALICIOUS

PDF

79.3 KB Created: 2021-03-25 06:44:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 712d237625b2b769eaa02d86bcfbe811 SHA-1: 12f406f5686b061e8288e011e1b173e9d9a5592e SHA-256: 2bf59104b2f4ab3bcfa831e04765c17f80a21cbf1e3fa18cd6169daf7c8ff4d8
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. The embedded URLs and the nature of the link farm suggest an attempt to lure users to malicious 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://vilenefex.ru/wix?keyword=hornady+reloading+manual+pdf+free PDF link annotation
    • https://cdn.sqhk.co/pajokiman/9gchcji/47088640239.pdfIn PDF document text
    • https://cdn.sqhk.co/lexijunibul/3hfVjhQ/pifumijotuborux.pdfIn PDF document text
    • https://cdn.sqhk.co/natefisaka/hhjUhcU/xibulowaneraja.pdfIn PDF document text
    • https://cdn.sqhk.co/nolagutotato/ZGgfbjd/fruit_doctor_my_clinic_on_airline.pdfIn PDF document text
    • https://cdn.sqhk.co/vifejoneses/ihhgdJz/68637418346.pdfIn PDF document text
    • https://cdn.sqhk.co/wemitupu/hcjix4M/85979834829.pdfIn PDF document text
    • http://jubuvojikemipi.iblogger.org/regions_in_the_philippines_worksheets.pdfIn PDF document text
    • https://cdn.sqhk.co/mivuxakadu/bUhijhT/gibolexusapim.pdfIn PDF document text
    • https://cdn.sqhk.co/jizuxadif/jezjbpf/fawosezitodewafivodagos.pdfIn PDF document text
    • https://cdn.sqhk.co/budatumibowu/hjYjgic/mujavibaxugorekimajewo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gojikelo.epizy.com/franchising_ebook.pdfIn PDF document text
    • http://renirorevebu.epizy.com/judasefirigesedames.pdfIn PDF document text
    • http://nuvujudidasutem.rf.gd/gerd_guidelines_aap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81a20ebc-cf32-4759-9de1-872b59b905e2/48354972853.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de9e9ef0-2cfd-4e47-a026-95266c295530/what_does_visually_aesthetic_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee9fe105-be33-48ca-86b6-de7e5843e74e/how_long_to_make_chicken_jerky_in_dehydrator.pdfIn PDF document text
    • https://0298dc5a-7924-4276-8279-06452a5288da.filesusr.com/ugd/b30cf0_858f76a7088c4817bde623d22ea6cf46.pdf?index=trueIn PDF document text
    • http://kodataruturi.rf.gd/commitment_of_traders_report_graph.pdfIn PDF document text
    • http://nosorozu.epizy.com/nosafijuteferalidak.pdfIn PDF document text
    • http://mofikasim.epizy.com/alice_in_chains_nutshell_piano_sheet_music.pdfIn PDF document text
    • https://d3826037-6016-486c-99e9-dc41bc666644.filesusr.com/ugd/b81754_f1caa38b8a2b40d2ac130b27c62d0fbc.pdf?index=trueIn 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DC 5244 bytes
SHA-256: c957ecdda44947c8bb95d85e7c4308d205fe242a3a9383dbb101f531cc61573f
font_01_sfnt_off0000faa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA8 11160 bytes
SHA-256: 2aa24ed9820e8909c314b39c5e33fc19973f752f1b9d65893d00c5105582ecab
font_02_sfnt_off000120aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120AA 6076 bytes
SHA-256: 78247699ea725f899009aa762b323b068484dfb2d4f2b7974ae1abf5fb15e3e0