Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0848c0082c10246…

MALICIOUS

PDF

75.4 KB Created: 2021-03-29 21:04:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd047a071d59d7a4dfba78311b9f37fc SHA-1: b1c4587208d5c1ac8719943bdb79d52ca89c0872 SHA-256: d0848c0082c10246448b1ab6410734c5face276bd3be2d52520496c200d7ae35
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 hosted on disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers flagged this as malicious, specifically a phishing trojan. The embedded URLs and the structure suggest the document is designed to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/123?utm_term=best+nds+roms+free++site
    • https://duniterete.weebly.com/uploads/1/3/4/6/134690204/vofigoxis.pdf
    • https://faxomozux.weebly.com/uploads/1/3/0/7/130775398/ribejiseli.pdf
    • https://cdn.sqhk.co/leloxoreje/iiDhigd/zajat.pdf
    • https://wizenifove.weebly.com/uploads/1/3/4/3/134308138/natikilu-wiruxuko.pdf
    • http://vapurese.22web.org/539984905.pdf
    • https://gijajagilaz.weebly.com/uploads/1/3/5/3/135313732/8917126.pdf
    • https://cdn-cms.f-static.net/uploads/4381751/normal_6057a71f47124.pdf
    • https://xubidanata.weebly.com/uploads/1/3/4/8/134895671/wupaserajonal.pdf
    • https://gosevitugelaw.weebly.com/uploads/1/3/4/4/134439416/jugofo.pdf
    • https://vobudofokivelux.weebly.com/uploads/1/3/4/5/134599261/f6338726.pdf
    • https://nagejezesalu.weebly.com/uploads/1/3/0/8/130874580/folizi_bimafudis_sejokejekixok.pdf
    • http://mobevusujezuno.22web.org/65025646001.pdf
    • https://cdn.sqhk.co/pelopuxi/hbU6Fgi/87142333093.pdf
    • http://nelawetazabuta.66ghz.com/vigefavaxonajolotedu.pdf
    • http://zanupolema.iblogger.org/storm_in_a_teacup_book_free_download.pdf
    • https://zowemuxojawoput.weebly.com/uploads/1/3/4/3/134357794/tasajiwisidad.pdf
    • https://cdn-cms.f-static.net/uploads/4471474/normal_5fd652e4930a7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lakadutof/arya_2004_songs_free.pdf
    • https://s3.amazonaws.com/zoromexemuzid/35139394586.pdf
    • https://s3.amazonaws.com/firudegix/funubo.pdf
    • http://bokonejedebi.rf.gd/maytag_bravos_xl_dryer_troubleshooting.pdf
    • https://s3.amazonaws.com/wibedubosateg/top_10_tamil_movies_2019.pdf
    • https://s3.amazonaws.com/kefodek/maytag_bravos_mct_washer_reset.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebaf.bin
b5df847b924dff241c9ad70ec29898b13940cbec898dbedfb838fa18da3ea56e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAF 4860 bytes
font_01_sfnt_off0000fc21.bin
10692fd63ff41cfc65fc9c63e2ad477172e84f08c384cd8a6b52a9143fdc064b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC21 10728 bytes

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