Malicious PDF — malware analysis report

Static analysis result for SHA-256 918299adf156efed…

MALICIOUS

PDF

71.1 KB Created: 2021-01-31 16:50:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: ddf9c862273ed8c5f487b559ce10706c SHA-1: 14d5c6d7dd83db4d00af3a7f3f9bee33c84fd14a SHA-256: 918299adf156efedc1965aae5f951e94175b45dedfb56d241315b5dcc1658a90
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a malicious intent to direct users to potentially harmful websites. The ML classifier and ClamAV detection strongly indicate maliciousness, with the primary attack pattern being the distribution of links. While no scripts were explicitly extracted, the nature of PDF link farms often involves JavaScript for obfuscation or redirection, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://seumenha.ru/123?utm_term=two+dimensional+art+meaning PDF link annotation
    • https://vifiboreb.weebly.com/uploads/1/3/5/3/135349596/8062030.pdfIn PDF document text
    • http://modernstyle.pro/womigivudugof7hauy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374963/normal_5fe8fd39a0fbc.pdfIn PDF document text
    • http://italdom.fun/cmos_digital_integrated_circuits_analysis_and_designnot21.pdfIn PDF document text
    • http://abanca-electronica.com/mimezajejefigakanubawojurko5s4.pdfIn PDF document text
    • http://nutristrike-shop.ru/77614610711j6obj.pdfIn PDF document text
    • http://likelid.xyz/vizetofitewuterazi5ccqq.pdfIn PDF document text
    • https://seporulakokifo.weebly.com/uploads/1/3/4/5/134590723/sejikafujomerisa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jepinebawo/rorebimuwonajowil.pdfIn PDF document text
    • https://s3.amazonaws.com/runuzitexokol/58070133140.pdfIn PDF document text
    • https://s3.amazonaws.com/kobivimelelo/kuziguwaniwozinovew.pdfIn PDF document text
    • https://s3.amazonaws.com/savifin/minecraft_minigames_server_map.pdfIn PDF document text
    • https://s3.amazonaws.com/bikikanafopavu/50944327414.pdfIn PDF document text
    • https://s3.amazonaws.com/xufujofaleki/czardas_violin_music_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/veponapuzufutorijulodof.pdfIn PDF document text
    • https://s3.amazonaws.com/miledu/wuvisig.pdfIn PDF document text
    • https://s3.amazonaws.com/zoromexemuzid/aide-_mmoire_macroconomie.pdfIn PDF document text
    • https://s3.amazonaws.com/wewuxuviwar/59038328175.pdfIn PDF document text
    • https://s3.amazonaws.com/xisakazelelinim/cd_cover_template_indesign_free.pdfIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC87 5188 bytes
SHA-256: a735b15d4462c13665e13b403c78b5b53ed4bd113c68f78c0c06a708bc567d7e
font_01_sfnt_off0000ee1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1F 9664 bytes
SHA-256: 1bf35a0a039e661c8c9853f2d74d82132a129816e6301d1dbc3519898f8ee55f

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