Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce55dfaa36b34165…

MALICIOUS

PDF

86.5 KB Created: 2020-11-23 04:06:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: d543a74eeee5f54477d8d3f2bc19daf8 SHA-1: 941d3ab9654cb40c33858a8af055d3c99e4a2e34 SHA-256: ce55dfaa36b3416533602648f8374368eb3bed28c0c6f293a5c8d5330609f736
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body appears to be obfuscated or corrupted, preventing a clear understanding of its specific lure, but the presence of a malicious redirector is a high-confidence indicator of a phishing or malware distribution attempt.

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
  • 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.
  • 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/123?utm_term=spires+of+agartha+forum In PDF document text
    • https://cdn-cms.f-static.net/uploads/4388611/normal_5f95e5eb31b19.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366045/normal_5f9610deb41b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428342/normal_5fb5ea5f17e84.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409814/normal_5faaab375c76d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402504/normal_5f9f9f2a080f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369638/normal_5f881bf84659e.pdfIn PDF document text
    • https://lifesodoxeduze.weebly.com/uploads/1/3/4/3/134372712/dufagif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426410/normal_5f9babb7c64a6.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/ffdf13d8-5698-431b-881c-f8d47e3b0eed/25083883411.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/280d5dde-1f09-474d-93ed-4816188bdacc/google_3d_map_app_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/bulalowisu/71938923538.pdfIn PDF document text
    • https://s3.amazonaws.com/wifozuxeku/99472602625.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/vonojulimo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bb8575b-645e-414a-a0f2-d10a012c9826/1342347898.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_off00011397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11397 5388 bytes
SHA-256: 7954e37009d6d391d8d6f79719ad0fea666a2387e5d8bb8e709280441d385102
font_01_sfnt_off000125bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125BD 11552 bytes
SHA-256: 6daa3b190ccb81abdc7cbd3be97682a06511b3c9d5860ea3ae3f664139c4767d

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