Malicious PDF — malware analysis report

Static analysis result for SHA-256 9530447e7b8c9b4f…

MALICIOUS

PDF

71.3 KB Created: 2020-11-25 14:49:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 096fb3b2a4b4249c1e251cf5b9d1cea4 SHA-1: b2f439c47f406b28bf13df8ad1444822799caf7b SHA-256: 9530447e7b8c9b4f41bbaca69e9389abe78d135222fa8b5060c1863f7349ebf4
254 Risk Score

Malware Insights

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

The PDF contains numerous links to redirector infrastructure, specifically `https://ggtraff.ru/strik?utm_term=iso+13485+pdf+espa%25C3%25B1ol+download`, which is flagged as a malicious redirector. This suggests the document is designed to lead users to malicious websites, likely for phishing or malware distribution. The presence of multiple PDF links and the ML classifier's high confidence score further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://ggtraff.ru/strik?utm_term=iso+13485+pdf+espa%25C3%25B1ol+download In PDF document text
    • https://cdn-cms.f-static.net/uploads/4462038/normal_5fac210658fa6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402486/normal_5fa970b26a71a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449402/normal_5fa09e601b239.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404520/normal_5f9aaeea30484.pdfIn PDF document text
    • https://jefapijuwenumik.weebly.com/uploads/1/3/4/4/134435530/wixoze_potebazitoraw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368998/normal_5f8a4c5216b08.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/ruzumeb/android_caller_id_app_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/765ff6ce-b697-4ae3-b93d-852ab83dc683/68932009463.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_off0000d5ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CA 5800 bytes
SHA-256: 635341394ea51835c7128650be26b98f14071d58cadb08bd248e3e5cfad5fd0e
font_01_sfnt_off0000e97d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97D 10952 bytes
SHA-256: 28ce72f200e44fc733d5972213b0b6d4c3ca5a59a8fd50d62e171eca1f7ec6ed