Malicious PDF — malware analysis report

Static analysis result for SHA-256 93f6a0bb716117a8…

MALICIOUS

PDF

71.2 KB Created: 2020-12-26 16:44:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 9fa004686846ae7224c9f25c8a770543 SHA-1: b425e34f8875acd3f6b96e33c3d0465c522d31a9 SHA-256: 93f6a0bb716117a87eb5c33db54490d750da2396861695d8f3cfd17699c73e84
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to S3 buckets, which is indicative of a link farm or SEO spamming technique. One of the URLs, 'https://trafftec.ru/123?utm_term=kisscartoon+apk+download', suggests a lure for software downloads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing unwanted software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafftec.ru/123?utm_term=kisscartoon+apk+download PDF link annotation
    • https://rubuvewoxuvima.weebly.com/uploads/1/3/4/8/134873715/7540516.pdfIn PDF document text
    • https://cdn.sqhk.co/jumifokujuje/jjcDjcr/62652745122.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/sasufufa/faxerowimiwebekinusetujo.pdfIn PDF document text
    • https://s3.amazonaws.com/purixifusipelid/artrosis_de_hombro_tratamiento_fisioterapeutico.pdfIn PDF document text
    • https://s3.amazonaws.com/lonozote/93521170851.pdfIn PDF document text
    • https://s3.amazonaws.com/sixenogafopoj/alimentos_ricos_en_gluten.pdfIn PDF document text
    • https://s3.amazonaws.com/tumasun/bugufolawimogarij.pdfIn PDF document text
    • https://s3.amazonaws.com/jemazejodep/ambari_kannada_movie_audio_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/tobobowu/vivoto.pdfIn PDF document text
    • https://s3.amazonaws.com/jemazejodep/8498490327.pdfIn PDF document text
    • https://s3.amazonaws.com/sasufufa/38115161202.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_off0000d984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD984 5192 bytes
SHA-256: 00d08ce76472baacedf858dd736871eeb5f76394f64b79a0e35fc3868aaaac6d
font_01_sfnt_off0000eb50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB50 10752 bytes
SHA-256: 2523660465ef01fc1b9e89927329dc4df30ffb32cb051a42b84896526544f233

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