Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b8fda652bfb6bb3…

MALICIOUS

PDF

72.6 KB Created: 2021-01-06 20:36:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 566c5b54ff18db61e53cc6568400bd04 SHA-1: 29f4a1877467810f8d8842a8d0de5d1cfb5c6b98 SHA-256: 3b8fda652bfb6bb30d48aeddbe0032114b46c2cb7b90ee312cedf5b5b14a2846
164 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an invoice-themed lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://traffking.ru/aws?utm_term=budget+spreadsheet+printable PDF link annotation
    • https://bulugigedi.weebly.com/uploads/1/3/4/7/134714886/9730034.pdfIn PDF document text
    • https://nopefulewipedu.weebly.com/uploads/1/3/4/3/134314682/7956e4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/satedafadusizo/goalkeepers_with_most_clean_sheets_ever.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88a3ba45-11d2-458a-b3c0-f9d391ec072a/gestion_de_stock_d_une_pharmacie_en_java.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88b38f8d-65b9-4531-beeb-ae8fa7bbab58/29884161395.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16b138b4-a1e3-4cb9-bcd3-94c29695452c/conflict_immunity_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2c5f367-c6da-446a-b6d4-bb6c7716fc9b/benchmade_infidel_3300_review.pdfIn PDF document text
    • https://s3.amazonaws.com/baritexovopa/ignou_admission_form_for_ma_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cece62d-70a8-44d8-bdbc-f2c4fbabd566/97762587930.pdfIn PDF document text
    • https://s3.amazonaws.com/towakog/4824756051.pdfIn PDF document text
    • https://s3.amazonaws.com/xakapudakadu/breaking_free_from_ocd_a_cbt_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/gupawupigawono/cirrosis_hepatica_alcoholica_fisiopatologia.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD149 5180 bytes
SHA-256: e8ae01d82efc3a9a71f66fa1ba08cbf84e2e9095ea1a70d52047eae4ebb20fc7
font_01_sfnt_off0000e2d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D1 10644 bytes
SHA-256: 45963600a608963aff34462d6bedee968762c8bf1cf95165bb2279478d0b6586
font_02_sfnt_off00010747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10747 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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