Malicious PDF — malware analysis report

Static analysis result for SHA-256 c09418e33bb03928…

MALICIOUS

PDF

71.9 KB Created: 2021-02-04 11:44:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: cca7a4cadce9fe54fcadd00a9e00698c SHA-1: c06ed3bb1f80211bde02af279028308325cfa988 SHA-256: c09418e33bb039286030d01f29ce8f0803a1c415c64d9c2f7338c49298e1f87f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to SEO-optimized PDF farms, indicating a potential link-farming or redirection scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://leonvi.ru/wb?keyword=logiq%20book%20xp%20transducer%20guide PDF link annotation
    • https://gorofegi.weebly.com/uploads/1/3/4/4/134462705/8405824.pdfIn PDF document text
    • https://gitinegu.weebly.com/uploads/1/3/4/6/134648864/986180.pdfIn PDF document text
    • https://wepebajaka.weebly.com/uploads/1/3/4/5/134588919/gatujatibewasu.pdfIn PDF document text
    • https://sumesomorap.weebly.com/uploads/1/3/0/7/130738681/dibopufitedutu_laxodazurizebe.pdfIn PDF document text
    • http://avto-trokot.xyz/picsart_photo_studio_app_free_downloadyymd6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417023/normal_5fd87c00dc989.pdfIn PDF document text
    • https://xetebozeb.weebly.com/uploads/1/3/1/8/131872130/vimedarupupufutu.pdfIn PDF document text
    • https://molobaguzali.weebly.com/uploads/1/3/0/7/130739923/1374298.pdfIn PDF document text
    • https://fuwamelewupo.weebly.com/uploads/1/3/4/1/134131589/6017049.pdfIn PDF document text
    • http://vorecan.space/automatic_document_feeder_not_workingr3kdn.pdfIn PDF document text
    • https://deserekinubolid.weebly.com/uploads/1/3/4/3/134319780/mojekojadusi_safudidedobaj.pdfIn PDF document text
    • https://vulopinuvi.weebly.com/uploads/1/3/1/1/131164419/wudizikebebewi.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/zufaxepixiguxax/10486416581.pdfIn PDF document text
    • https://s3.amazonaws.com/besafefaf/mesoxidopufes.pdfIn PDF document text
    • https://s3.amazonaws.com/vufuzewasi/functional_skills_reform_maths.pdfIn PDF document text
    • https://s3.amazonaws.com/dusined/36623281571.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_off0000dacd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACD 5548 bytes
SHA-256: f4973fb32338e9459e93d02b293626332ba46d1b199525586d58a88684e4cb16
font_01_sfnt_off0000edaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAF 10960 bytes
SHA-256: e25a4a194c8c6023d7064b1370471b372fe68fa4858e1c9395658a7430e62a51

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