Malicious PDF — malware analysis report

Static analysis result for SHA-256 7739aa0b9dcd9352…

MALICIOUS

PDF

65.3 KB Created: 2020-11-25 08:31:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 68da386a84989c338419b5def8c517c1 SHA-1: bed1b1661412e62f9a849f8af716e5e99805d663 SHA-256: 7739aa0b9dcd93521be43320120a53366190051c28b9d5b2bb125e4965495773
164 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, a critical heuristic firing for a 'PDF_SEO_LINK_FARM', and a visual download button lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and external links suggest it's designed to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/aws?utm_term=adblock+chrome+apkpure PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366375/normal_5f9a93fb8af89.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370989/normal_5f8ca3c11b7d3.pdfIn PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/4102594.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371272/normal_5f95dbb1ecbdf.pdfIn PDF document text
    • https://ridolagu.weebly.com/uploads/1/3/0/7/130775195/gipijepaborakon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412599/normal_5f99428c0e323.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374181/normal_5f962b3c62616.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404500/normal_5fa2ef437b75a.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/100c07db-7d79-44f8-b13b-f76c7946dbba/jurikigakadivubepekufozos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a4ca340-547b-4e00-83e6-181ec9b5e761/mavebonowekutavebubojizo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21d49bcc-e70e-48a7-aeba-7dfa304635fe/63765584371.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_off0000c402.bin
272d0ca437ed06c40038bf6a3c1a4a57a576a24756d3b12531ebe57d59c0aa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC402 5328 bytes
font_01_sfnt_off0000d5ef.bin
70976e1a73c44db4e2fd8c99dba6db8786649afd7f130acfbeb1759cd8ce00cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5EF 10228 bytes

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