Malicious PDF — malware analysis report

Static analysis result for SHA-256 a561ff3e89df6322…

MALICIOUS

PDF

97.9 KB Created: 2021-01-16 14:09:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: c13f51909b2555b7541072a349db9330 SHA-1: 99476ee773825bc4965af340472531a1a7b5fe8b SHA-256: a561ff3e89df6322aad996b9ac126e946edc363637f75a9948d176029ec42eff
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, suggesting it functions as a link farm or a distribution point for further malicious content. The document body, though partially obfuscated, references 'New pneumonia guidelines 2018', a common lure for phishing or malware delivery.

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://trafftec.ru/aws?utm_term=new+pneumonia+guidelines+2018 PDF link annotation
    • https://cdn.sqhk.co/judixixelof/hchagdd/vatigeroxokisuxob.pdfIn PDF document text
    • https://cdn.sqhk.co/risubibasero/jghdvyl/lenugel.pdfIn PDF document text
    • https://wumaluko.weebly.com/uploads/1/3/4/7/134716396/5648556.pdfIn PDF document text
    • https://cdn.sqhk.co/togareguko/gzLDrja/xivemuwogapiwuru.pdfIn PDF document text
    • https://cdn.sqhk.co/powirafawume/evificj/funny_video_download_whatsapp_status_share_chat.pdfIn PDF document text
    • https://cdn.sqhk.co/wikelere/iehfgha/46520439294.pdfIn PDF document text
    • https://bilujadaju.weebly.com/uploads/1/3/4/7/134772480/8794196.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366340/normal_5f87e63f2eef5.pdfIn PDF document text
    • https://faripolugariwel.weebly.com/uploads/1/3/1/4/131453512/mebawapuk.pdfIn PDF document text
    • https://cdn.sqhk.co/fogobewataja/AyAcvji/gomesigevomilasumixukosil.pdfIn PDF document text
    • https://site-1180367.mozfiles.com/files/1180367/78936043937.pdfIn PDF document text
    • https://site-1176683.mozfiles.com/files/1176683/cifrar_definicion_informatica.pdfIn PDF document text
    • https://cdn.sqhk.co/lazujanaziri/jiNAheK/rosugarekubidulem.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00013cf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CF0 5764 bytes
SHA-256: d4d069a7c5c222e16d78b115d0217bc8081ea5697958cd451a9aecd9551a29df
font_01_sfnt_off0001509b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1509B 13520 bytes
SHA-256: d88c6924b677fecfa6f7b22dbb1c85020eac2447cf02ac04de672fa3cc232a4d

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