Malicious PDF — malware analysis report

Static analysis result for SHA-256 86d5eac39aa6ee86…

MALICIOUS

PDF

73.4 KB Created: 2021-03-23 23:31:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7098c8f16e04f09fa9c3fc0670f1a6f3 SHA-1: df65ea37a3b9408c093e5a16a5da4477a5afebee SHA-256: 86d5eac39aa6ee8651c568380cb135134f6d14595b1619fb7c1b321a87ace525
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which are SEO-themed, suggesting a link farm or a lure for users searching for specific content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution via the embedded URLs. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/award?keyword=water+cycle+worksheet+6th+grade+pdf
    • https://logekififej.weebly.com/uploads/1/3/4/5/134502341/nuxadajet.pdf
    • https://cdn.sqhk.co/jabisopomuxo/ghjiTyH/basketball_legends_2020_poki.pdf
    • https://cdn.sqhk.co/sutazojawote/hghiH9l/79249358756.pdf
    • https://mokenexub.weebly.com/uploads/1/3/4/4/134478104/44957eaca41.pdf
    • https://vasoderavir.weebly.com/uploads/1/3/4/7/134728489/gawusozorofowal_lazixokuweg.pdf
    • https://karegito.weebly.com/uploads/1/3/4/6/134626514/7888198.pdf
    • https://sikefenuvip.weebly.com/uploads/1/3/4/0/134012601/1d776386088.pdf
    • https://vubufogos.weebly.com/uploads/1/3/4/7/134766152/1723112.pdf
    • http://gerawat.22web.org/13295186543.pdf
    • https://rarezeromodon.weebly.com/uploads/1/3/0/8/130874170/c6fea.pdf
    • https://cdn.sqhk.co/mabisurud/jfqjigf/dude_perfect_net_worth_2018.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zevutebulaworel/wednesday_weather_report_hourly.pdf
    • https://393102e6-89af-4738-8cad-89662dba8dc5.filesusr.com/ugd/33a16d_a4b8c982c22c41879688ba67487e5a98.pdf?index=true
    • http://dawazikavazav.epizy.com/kauai_beach_club_resort_map.pdf
    • https://s3.amazonaws.com/difigomisosak/dabebotirowofaza.pdf
    • https://s3.amazonaws.com/mijumomub/dvt_prophylaxis_orthopedic_surgery_guidelines_australia.pdf
    • https://s3.amazonaws.com/ponivotigegepub/boxing_game_softonic.pdf
    • https://c809e8a6-5bdf-489d-8d8c-df4e4638a115.filesusr.com/ugd/45a296_b1df6d811d244c41a61bc92b86255c70.pdf?index=true
    • https://s3.amazonaws.com/dafumuxitupav/qu_son_las_ciencias_formales_y_empiricas.pdf
    • http://gapifemesi.rf.gd/lubowesemilib.pdf
    • http://mofebuxigonewo.epizy.com/lawef.pdf
    • http://biborufa.epizy.com/newupikobixise.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_off0000e03d.bin
607508658ce8648fd76dae5594dfcbdf360c0c8be8ad0b9c240af4b982cbf082		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE03D 5844 bytes
font_01_sfnt_off0000f442.bin
79803ecde544bf59114e3be208924656ae3ae851fe9ec65ef94ea49cde2075e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF442 10592 bytes

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