Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcc0a22baee176c0…

MALICIOUS

PDF

65.3 KB Created: 2021-01-17 04:38:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 034839b9740ca6b585b96dc58ccf60a3 SHA-1: c8d5d7f5840aacd2a486e86fc850214da3a4d2d0 SHA-256: bcc0a22baee176c0ba9d8fc3dd79327bfc68f3b51ce732de37fc670cf4c3e085
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 pointing to S3 buckets, suggesting a link farm or SEO manipulation tactic. One URL, 'https://traffset.ru/wb?keyword=word%20collect%20daily%20challenge%20january%2028%202020', appears to be a lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

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://traffset.ru/wb?keyword=word%20collect%20daily%20challenge%20january%2028%202020 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4475580/normal_5ff793f34722e.pdfIn PDF document text
    • https://xipezote.weebly.com/uploads/1/3/4/8/134882979/9488042.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459464/normal_5fa5b3a204888.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502906/normal_5fb7f64f80b0c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388067/normal_5faf7c7e4b8b2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385412/normal_5fe3f4c1516eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381091/normal_5f8c02489ef18.pdfIn PDF document text
    • https://fimegelepa.weebly.com/uploads/1/3/3/9/133999933/fusuderitur.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485589/normal_5fcdd657dc572.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/wozowuledij/axis_camera_application.pdfIn PDF document text
    • https://s3.amazonaws.com/suximawo/venkateswara_devotional_songs_in_telugu_free.pdfIn PDF document text
    • https://s3.amazonaws.com/voxazedisula/timocom_app_android.pdfIn PDF document text
    • https://s3.amazonaws.com/tabobujimo/handicap_parking_form_ontario.pdfIn PDF document text
    • https://s3.amazonaws.com/bidejonixom/75604214162.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
stream_002_off0000c2a7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xC2A7 5684 bytes
SHA-256: e8769f0879aadb87f7114675a19c30f818955ef41081aa2430737b710a356814
font_01_sfnt_off0000d613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD613 10104 bytes
SHA-256: 4330675df1b8126099dcf488b0168a0f4f4d935de818fc9e8df9172e90c805a3

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