Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa92a462fe389355…

MALICIOUS

PDF

67.3 KB Created: 2020-11-30 08:04:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 5a9c8963633fc3e24fe0b37fc1dd18ff SHA-1: dbfc3cfaa7630141adafe26da8d6dc5cd44ba5aa SHA-256: aa92a462fe389355260a0ae555b8e3fc5a467216b3b99f8f01537514d137a4a5
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://trafficel.ru/strik?utm_term=fairways+country+club+golf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369504/normal_5fa671a6df664.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470399/normal_5fc45f53ed2f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367296/normal_5f8cf148c76e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408987/normal_5fb9a8d65b0b3.pdfIn PDF document text
    • https://botubadixebom.weebly.com/uploads/1/3/1/4/131407995/9437189.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/f6a0cf21-9cf1-44d2-831a-d654c45dd642/vusixovomorigizuxe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4105bb6f-d9f3-4dda-a874-62144d1c939e/31552760066.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e637d6d-62bf-48bb-a4f0-0ba3ccc51136/zixuvunokubazubazan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6a6f462-34f9-4b00-8032-9048d8564995/gretchen_wilson_all_jacked_up_album.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb9cf0cb-0f1b-4d9e-84a3-613b7cb9345e/live_pd_jeffersonville.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/092820e4-b54e-4533-95c7-6c7c89645577/heroes_of_stalingrad_expansion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0338eaf2-a607-45af-8425-ba3b461ffd5f/risixog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2b3f2fd-59b3-4e99-9393-bf09694b279f/wahoos_gluten_free_menu.pdfIn PDF document text
    • https://s3.amazonaws.com/teximikamukubo/20794027590.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_off0000cc25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC25 5340 bytes
SHA-256: a123623d04f3b9998978a56fb62c8a41fc06fe7e50ee08c2b31ee1af1b0df452
font_01_sfnt_off0000de80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE80 10064 bytes
SHA-256: 55c712d8d11332cd4a21541a40d27b8f20a312be1476f314eb31f6f0671d73f1

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