Malicious PDF — malware analysis report

Static analysis result for SHA-256 413c269396bde4eb…

MALICIOUS

PDF

63.3 KB Created: 2020-11-23 02:11:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: e7c7e97e0d25cffa55bd956b83c14f26 SHA-1: b5cc250b80693c810b6256649851198fed62de92 SHA-256: 413c269396bde4ebb13f18c4821bbb9e7d4e222233e590104777c6d06f0a5cb4
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files. One of these links, https://trafficel.ru/123?utm_term=brazilian+black+beans+without+pressure+cooker, is flagged as unknown reputation. The ClamAV detection and ML classifier strongly indicate maliciousness, likely related to phishing or malware distribution via these links.

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://trafficel.ru/123?utm_term=brazilian+black+beans+without+pressure+cooker PDF link annotation
    • https://boburebapexew.weebly.com/uploads/1/3/4/5/134597485/vasurotowesogixif.pdfIn PDF document text
    • https://rajomiluti.weebly.com/uploads/1/3/2/6/132682989/7544761.pdfIn PDF document text
    • https://damijuvik.weebly.com/uploads/1/3/1/3/131381376/2453840.pdfIn PDF document text
    • https://bakuwosir.weebly.com/uploads/1/3/0/8/130874569/9232815.pdfIn PDF document text
    • https://gojemafofapuvog.weebly.com/uploads/1/3/2/6/132681271/b2a8914.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9ba820b-e382-4441-9202-d91011016c41/56903832125.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79d17be9-c531-45b2-9a63-6c1ec0c42efa/37499629424.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2785e0ce-706b-417e-b511-2a0d00e2cd0c/series_of_unfortunate_events_book_1.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/amarilli_mia_bella_noten.pdfIn PDF document text
    • https://s3.amazonaws.com/gonima/war_horse_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d489647-fae7-48de-95af-21c2bd4d8412/nikudejexi.pdfIn PDF document text
    • https://s3.amazonaws.com/votubukaxogilix/80698278585.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b2130ea-565f-4574-81d7-ccbee79a153d/ramudeneleperizotalobibur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fe06e6f-9a68-4204-aa91-ec4f675f2ea2/love_lesson_korean.pdfIn PDF document text
    • https://medlineplus.gov/recipes/rice-with-black-beans-and-sausage/In 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_off0000ba07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA07 5416 bytes
SHA-256: 060d895d298ae59c764cdbb9c8e422a416711dc833efba7a1771b177cc2c61b1
font_01_sfnt_off0000cc85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC85 10532 bytes
SHA-256: 83e24b2a7db33b59234f239e0d6a0eef94e76614685afabfca81e720d5c3fc27

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