Malicious PDF — malware analysis report

Static analysis result for SHA-256 c959f3edf173bde5…

MALICIOUS

PDF

65.2 KB Created: 2020-11-18 22:27:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: be93c235f562ef1421190cfb8e66964c SHA-1: 9c4349a60067bcf8d9c7d74d5f3b1b81c2de6cf1 SHA-256: c959f3edf173bde5e065d0f74810a97a2bb42135ee8657dd5284504eb1dcb445
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly and S3 domains, suggesting a link farm or distribution point for malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution lure, likely leveraging embedded JavaScript for malicious actions.

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://traffine.ru/123?utm_term=the+book+of+life+spanish+worksheet+answers PDF link annotation
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/b919b1ed8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390095/normal_5f916450d3a7e.pdfIn PDF document text
    • https://paboludozov.weebly.com/uploads/1/3/4/3/134333588/dibaba.pdfIn PDF document text
    • https://zuzolavilasobin.weebly.com/uploads/1/3/4/5/134523903/4690292.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368266/normal_5f8a1ba5a7dd3.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/wovitiku/drop_baby_drop_tabs.pdfIn PDF document text
    • https://s3.amazonaws.com/bugutaj/the_reading_strategies_book_download.pdfIn PDF document text
    • https://s3.amazonaws.com/wajibile/drunk_parents_2019_parents_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/jovekus/10237817871.pdfIn PDF document text
    • https://s3.amazonaws.com/pizivurapab/bonaire_durango_evaporative_cooler_4500.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/52714728113.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b3b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3B8 5024 bytes
SHA-256: a48c0742e50031bae51acfdcf0ef997c25060eb343b8ac4f5ebf592c29825ce8
font_01_sfnt_off0000c4c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4C2 10296 bytes
SHA-256: f999204652b48bca558e958e136f57e0731e0ad381dfbbdb6b4a6c93ad1486b1
font_02_sfnt_off0000e7e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E0 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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