Malicious PDF — malware analysis report

Static analysis result for SHA-256 55ab84dbc9001685…

MALICIOUS

PDF

66.7 KB Created: 2020-11-24 08:53:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 9d2a53b4ba96bd1186bf04e4f5397e2a SHA-1: 3d2c21219748ccfe17b58bc67bf4d3ee8e97dce0 SHA-256: 55ab84dbc90016859f068dd2d0e04b8f01f4fa17d9700139e52e6f1529231222
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 0.9998

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://trafffe.ru/strik?utm_term=carta+poder+para+recoger+paquete+dhl PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4447464/normal_5fa73ed174809.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371247/normal_5f9b47a6b6f0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369629/normal_5f8cf067a2a45.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381082/normal_5f8e09b1172de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366385/normal_5fbab573c424a.pdfIn PDF document text
    • https://nirawulef.weebly.com/uploads/1/3/4/3/134324477/4fa2a3cc40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368223/normal_5f9e6d20f37c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366008/normal_5f87320da1790.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/2cf539bf-9d58-4ff9-b820-be222c0dbb96/soxuverisifodapesexi.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/zilew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9ea8363-b219-4db5-9053-c2024101df6c/introductory_algebra_12th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9a0b8aa-c0ae-41ca-a5a8-4a15e83cd545/dream_works_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29f23f45-ea4a-4c6d-80ed-8eaec4b827cc/23824163296.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fae8e2c5-7473-4ac1-bac8-51ac69795ab6/zenapuw.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/85060453478.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
font_00_sfnt_off0000c80c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC80C 5188 bytes
SHA-256: dcdeec18c735cfd955e932f345b523dc791f04acf362a298e2807fb50db7a874
font_01_sfnt_off0000d99f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99F 11220 bytes
SHA-256: a46707111be135d7c174234073f49afa6b8cfe67b56545197ce8cfe7bb8f13c1

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