Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a678dbb36b79ac4…

MALICIOUS

PDF

77.1 KB Created: 2021-09-11 10:30:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1212ba043a076ea94b4cedc0ed483ea0 SHA-1: a9857829951b3a43ae88f825f3db2a3acd5afcb6 SHA-256: 9a678dbb36b79ac4f0b0e3740d3acb78dedd225503ead247ba467b05cb287167
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many pointing to disposable or suspicious domains, suggesting a link farm or redirection mechanism. The PDF structure and heuristic firings indicate it's designed to lead users to external, potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 5

  • 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 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://coevent.ru/upload/files/medibutuzotutavurijidajut.pdf In PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613aab7c96fd5---81119426989.pdfIn PDF document text
    • http://blackhorsesc.pl/userfiles/file/23414174443.pdfIn PDF document text
    • http://isemya.by/modules/ariol/static/ariol/ckfinder/files/64230397061.pdfIn PDF document text
    • http://zatuchlina.cz/upload/file/9198456279.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/61384260133.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/90718767501.pdfIn PDF document text
    • https://buzascsaba.hu/userFiles/file/54720309197.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/gaderaritusatokexukokize.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/87040057278.pdfIn PDF document text
    • http://massintech.ru/img/outer/files/wosunedobovonozoxapawomu.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/nonenemarelazifu.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/lizelif.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/wusezepezaled.pdfIn PDF document text
    • https://lotteppta.net/beta/assets/file/nenejizabejitefeg.pdfIn PDF document text
    • https://movingalpsfoundation.ch/userfiles/file/78650989978.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/95478165246.pdfIn PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/8954165525.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/44137284561.pdfIn PDF document text
    • http://kirsanov-maslo.ru/uploads/80945512852.pdfIn PDF document text
    • https://ita.kru.ac.th/ckfinder/userfiles/files/wujemowajajerigufepijigo.pdfIn PDF document text
    • http://amindoost.ir/images/upload/files/98476432279.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/a20e359386d7f69be89ef6beddbb5c2e/38645237924.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/94949874572.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=randomizer+online+pokemonPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC777 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8E 10484 bytes
SHA-256: 05786c64b98ff6df7b275011342b461ce67d294c653551e7dedab165689467e7
font_02_sfnt_off0000f746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF746 18216 bytes
SHA-256: 76fd17497bf152bed6fb521a58f2c66cdad3dcdb5e5781870ac8777d2b4662e9