Malicious PDF — malware analysis report

Static analysis result for SHA-256 36c8fcb6be30b169…

MALICIOUS

PDF

70.2 KB Created: 2020-11-28 16:19:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 4231262e72ac2ce9715df4f2c7c6ead2 SHA-1: da52790ba85e27d2375d9b5761ae176ac1273c6a SHA-256: 36c8fcb6be30b169c7929aea7157c22d84d8a6685b122a8f8172ce490724d329
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=top+of+rack+switch+cisco PDF link annotation
    • https://rajerese.weebly.com/uploads/1/3/4/3/134387708/sukinozifozazo_tidukalirabuzip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382631/normal_5f8d8be36c996.pdfIn PDF document text
    • https://fosogaji.weebly.com/uploads/1/3/1/4/131455903/7592310.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413701/normal_5fc0c21a1d8e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401697/normal_5f96351a9b012.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vazisi/wolowtube_for_free_account.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15979e16-f232-4e13-9e7b-b56d94a6ad19/short_story_outline_template_google_docs.pdfIn PDF document text
    • https://s3.amazonaws.com/luborinizu/autocad_2015_crack_free_utorrent.pdfIn PDF document text
    • https://s3.amazonaws.com/mamukawaxatali/marina_abramovic_performance_new_york.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb4888ef-4d0d-404c-9cee-fb305a83ad3f/10786517909.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cd0138a-0381-4b37-a8bd-c251cd8f900d/cartoon_hd_movie_er_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbd14a71-ab01-498a-92c4-301174c45f3e/1515343832.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc684362-f687-42a1-b79e-15d26b58b3d6/xagifezikeluladawer.pdfIn PDF document text
    • https://s3.amazonaws.com/bajuse/bulidubepepodajejutokana.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f04f8f9-6ed4-416b-afe1-98ec4f5a6412/trane_voyager_troubleshooting_manual.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_off0000d29d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD29D 5176 bytes
SHA-256: 7b2989842c93393caa2344fcf34d1bc904720deaec5d6c66e16fb82b8ec95cc9
font_01_sfnt_off0000e44f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44F 11372 bytes
SHA-256: b2f0b9a3c7d27c7ce75670eb4ca22bbdadf52291b527c3f9ddb2a3bc06c8b334

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