Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc90e3b7341c38a9…

MALICIOUS

PDF

105.7 KB Created: 2020-11-12 00:04:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: b2e70acd02e42c35eee63e34f9dacf5d SHA-1: 536a2cb6029db40e139abc18de2e734481df6b9c SHA-256: dc90e3b7341c38a9cf759800fb4f411779b3d7a37ed545173249b632a72ea34f
156 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. 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 0.9992

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://traffnew.ru/123?utm_term=transformers+animated+megatron+figure PDF link annotation
    • https://wolalusajiri.weebly.com/uploads/1/3/4/6/134600438/2735274.pdfIn PDF document text
    • https://bizepusenovub.weebly.com/uploads/1/3/4/5/134509919/begisilupa_lusiresefaxot.pdfIn PDF document text
    • https://mumifigade.weebly.com/uploads/1/3/4/3/134314269/pekunaz.pdfIn PDF document text
    • https://dexajuvado.weebly.com/uploads/1/3/4/4/134470202/zujorosajiguxoxigi.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/98ecf05d-5f54-4518-9fb9-195a3cc09d3f/jatanoladelubisix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e037482-86bc-4956-9b43-4a04793efc3b/kenuzivuvusisabominigu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bb529b2-711c-49b9-af28-efa9a1e19ffe/45180092462.pdfIn PDF document text
    • https://s3.amazonaws.com/nokiwovowus/94990141680.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab271c2d-e8db-48b9-bc6c-833f248a2c65/29676322449.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19a42e5b-e23f-4ee4-a387-57227abf9d4e/pawuf.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_off0001505c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1505C 5292 bytes
SHA-256: 4ef9ded05f907511e77004acde3ccb9d13fe63c6c3a98f481cd3888237d4f8c9
font_01_sfnt_off000162ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162ED 5144 bytes
SHA-256: a295d9fcf4ac4b614782a912123fd61d5b6e8571b533451334e1151379dd6fa0
font_02_sfnt_off00017450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17450 11108 bytes
SHA-256: e38a4f1d8a38a640c86023a0e5b84b043bf7f04bb56f95f7d7ca906208191fc2

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