Malicious PDF — malware analysis report

Static analysis result for SHA-256 064631d886e1d977…

MALICIOUS

PDF

81.2 KB Created: 2021-03-25 10:18:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b9d6ac4f692eb2005ae50e83faf8b6ac SHA-1: e0899a642685da3c6da488f1a85e47dbda8a9932 SHA-256: 064631d886e1d977ee053e51df387c1c8c7759cb80ea0cc38949556397e98a20
156 Risk Score

Malware Insights

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

The PDF contains a mass of external links, identified as a link farm, with one URL specifically appearing to be a search result for software downloads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://golowaki.ru/123?utm_term=hungry+shark+world+apk+day%25C4%25B1+indir
    • https://cdn.sqhk.co/noremixujor/hchHIgj/cadena_100_numero_cumpleanos.pdf
    • http://kafojiv.iblogger.org/89515653637.pdf
    • https://cdn.sqhk.co/dimowitop/DQfjfyp/sword_art_online_wallpaper_iphone.pdf
    • https://cdn.sqhk.co/tumowara/6XbRS7o/33494207984.pdf
    • https://cdn.sqhk.co/kixobaza/ahbijAw/40011618527.pdf
    • https://cdn.sqhk.co/sawibevas/iw4QG3L/mibiwuxobipipinaf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://b4095e1f-5e43-4c35-8b28-ff0c3185c247.filesusr.com/ugd/9cc3de_fe0547f6500e4ea9b9b759ad3b325744.pdf?index=true
    • http://kagimotazife.epizy.com/60968084366.pdf
    • https://9e705916-5bde-4eb8-be9b-8b3e910fbaf8.filesusr.com/ugd/c7a620_aac4bad8d76145b5ab0f6560ac60cea3.pdf?index=true
    • https://662517ce-f374-4037-aebd-99b1dbe00103.filesusr.com/ugd/0c4177_2f0888866e8f4c388ba18f4f850c1cb8.pdf?index=true
    • http://sevamunenu.epizy.com/513666669.pdf
    • https://71da2aa5-51c3-4f2c-ab18-08bbbad20131.filesusr.com/ugd/d216cb_95d270e5e0ac4d9a8e0acf2782775e5a.pdf?index=true
    • http://vawerixudebaf.rf.gd/carcinoma_infiltrante_de_cervix.pdf
    • https://2e8e3215-33bf-4fe1-bc67-b38dac560527.filesusr.com/ugd/269bb8_0d5d0201afd94056a0f2bcf6f5fc0ea2.pdf?index=true
    • http://dumiramuji.rf.gd/14759805906.pdf
    • http://nosikugabuvisal.epizy.com/capitalismo_e_liberdade.pdf
    • http://gixisenusadat.rf.gd/amazon_ec2_cloud_computing.pdf
    • http://ragupufonipona.epizy.com/87353094908.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3af.bin
fbef86dfb1f4725c805d5831b0cec8b143480a56c42585a9cfb4b8dcb2b5b7b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AF 5472 bytes
font_01_sfnt_off0000f65e.bin
f312f5d73cc955625ebab0ed9354de97a0716e02561d5f29d1676034a25cb45f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF65E 12712 bytes
font_02_sfnt_off00011efc.bin
684a3c196e802b4dc45ee85e0d12f41c83d6b6c6a55a83cec5fb8e332ee9aa36		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11EFC 16376 bytes

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