Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba6cc04ab858f2de…

MALICIOUS

PDF

105.0 KB Created: 2021-03-22 03:02:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2417840c475f4b151762db89baf2ba6a SHA-1: 71a17bf46518127338255fbeffb4af9f6681ad19 SHA-256: ba6cc04ab858f2de522783bb7a027eaaf80c1eb6544ecf877389ef5f5e5e8ef7
164 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' indicates the presence of numerous external links, suggesting a link farm or redirection scheme. While no scripts were explicitly extracted, the PDF structure and the presence of external links point towards a phishing or SEO manipulation attack, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=paid+publishing+guidebook
    • http://kogawanitikip.iblogger.org/tegeza.pdf
    • http://dotugigobeje.iblogger.org/manalimuraboxor.pdf
    • https://nebobaxewakizix.weebly.com/uploads/1/3/1/6/131637309/kazazefovejapiw.pdf
    • https://nigoriwidoke.weebly.com/uploads/1/3/5/2/135296580/nagaged.pdf
    • https://zoguripan.weebly.com/uploads/1/3/1/0/131070442/dinaxivuvusuke-xofetariwijelu-lopamize-mezamurugu.pdf
    • https://xanojamazifedim.weebly.com/uploads/1/3/5/3/135323589/lapixokel-ruwoto.pdf
    • https://xebuwonivaxatev.weebly.com/uploads/1/3/2/6/132696015/fajekinurox.pdf
    • http://xevamoz.mygamesonline.org/how_to_start_bitcoin_mining_for_beginners.pdf
    • http://bewilotaweje.mywebcommunity.org/lekamelojekaw.pdf
    • https://xufodikufidu.weebly.com/uploads/1/3/5/3/135382923/1656965.pdf
    • http://luwakixifotizim.iblogger.org/54783006629.pdf
    • http://mobufuwiwid.medianewsonline.com/44733562247.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://b860438a-ced3-4995-86f2-ad9a24e3f15c.filesusr.com/ugd/938eb2_6a6812ad30a04353b735cf158fb3b91c.pdf?index=true
    • http://vegenolipova.epizy.com/yowhatsapp_2019_for_android_mobile.pdf
    • http://tiwatimab.atwebpages.com/7218158047.pdf
    • http://zoxuditavuvov.rf.gd/the_butler_act_1944_disadvantages.pdf
    • http://doluxefewofelex.epizy.com/9408691137.pdf
    • http://nivedopiganezo.epizy.com/kaxakisebewasadoneji.pdf
    • http://lebasasasob.epizy.com/how_to_use_helix_lt.pdf
    • https://8c4778c4-ed17-4cf1-86f9-5448e21c5c15.filesusr.com/ugd/6da380_c29f2cce1c294799963c923c96b89ee2.pdf?index=true
    • http://megutid.epizy.com/nozegejafilesef.pdf
    • http://fasekefap.epizy.com/placenta_madura.pdf
    • https://a84030a7-2e48-4039-807a-383e2b7216cc.filesusr.com/ugd/c5d40f_e2adc75aedd04177a6aa53777526d949.pdf?index=true
    • 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_off00015d3b.bin
f21f69339194dd6f3d1a218e2d2d8fd9dd85e820c1a8213712a67f4dda462073		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15D3B 5328 bytes
font_01_sfnt_off00016f54.bin
0a184488d2736f4b558ba7cc86d4038d3dd0bec03a4791c93fb340d33a8aa2c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16F54 11392 bytes

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