Malicious PDF — malware analysis report

Static analysis result for SHA-256 b030d76e975479e7…

MALICIOUS

PDF

72.7 KB Created: 2021-01-12 22:01:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 0ac7cfb98a26168ac7fa8ce917e6ffdd SHA-1: d54d7d7d831bf6d06bf7b4b4db3dbdc77bac371c SHA-256: b030d76e975479e733c751792046f26c6664da77ae956f8eaeca4a8a9eda207f
164 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to other PDF files, suggesting a link farm or redirection scheme. The heuristic 'PDF_SEO_LINK_FARM' and the presence of numerous URLs strongly indicate a malicious intent to distribute further malware or phishing content. The ML classifier and ClamAV detection further support the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafficel.ru/123?utm_term=anticancer+a+new+way+of+life+free+pdf+download PDF link annotation
    • https://buwotudotep.weebly.com/uploads/1/3/1/6/131606539/gogozijegekev.pdfIn PDF document text
    • https://fufukarebalomok.weebly.com/uploads/1/3/4/3/134352968/a34b2ce.pdfIn PDF document text
    • https://paraminukus.weebly.com/uploads/1/3/4/7/134705680/a558659e7b6af97.pdfIn PDF document text
    • https://zukamukenipebo.weebly.com/uploads/1/3/1/3/131380388/eec5425dc90c21.pdfIn PDF document text
    • https://nububoreral.weebly.com/uploads/1/3/4/4/134467099/8156209.pdfIn PDF document text
    • https://zosekofafome.weebly.com/uploads/1/3/4/5/134595162/7563033.pdfIn PDF document text
    • https://rogapunuki.weebly.com/uploads/1/3/4/3/134375427/xebujexogoj-zixelis-povipumakajif.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/kovilowab/6380087622.pdfIn PDF document text
    • https://s3.amazonaws.com/dutuzanob/2008_cadillac_srx_4_owners_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwamoxamo/19015771958.pdfIn PDF document text
    • https://s3.amazonaws.com/polojuliragam/knuffle_bunny_2.pdfIn PDF document text
    • https://s3.amazonaws.com/dapekufoxiraku/surokojirogamojire.pdfIn PDF document text
    • https://s3.amazonaws.com/tubupejevomo/example_of_formal_letter_gcse_english.pdfIn PDF document text
    • https://s3.amazonaws.com/remavuj/43095265328.pdfIn PDF document text
    • https://s3.amazonaws.com/jepinebawo/tadadajatetowubemeru.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_off0000de23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE23 5152 bytes
SHA-256: 1e2825de02a5c026ec95de51e72d71272ca62a29ff1bf87a296f59af0b462a3f
font_01_sfnt_off0000efda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDA 11132 bytes
SHA-256: 7ab9f73fabee2130b7b3d7b66bbdf5617dfb0db4a092b50e28ba4e2dad07dcad

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