Malicious PDF — malware analysis report

Static analysis result for SHA-256 3712e93eb4a5aec5…

MALICIOUS

PDF

65.1 KB Created: 2020-12-19 01:03:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 36eb9e6296fe6ff8521092662f04e518 SHA-1: 4328c99ea734b0caee05cf4da8298fc217d5a4d1 SHA-256: 3712e93eb4a5aec5f6c58200c71e2a0461462f904fcd90a34aff8f9214bd5e23
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file contains numerous embedded links, many of which point to disposable hosting services and known malicious redirectors. The document body, though heavily obfuscated, contains text related to 'Paladins guide cassie', suggesting a lure to trick users into clicking these links. The high ML score and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://cctraff.ru/123?utm_term=paladins+guide+cassie In PDF document text
    • https://xoxamotanu.weebly.com/uploads/1/3/4/6/134653835/nizozovetek_fesogotiboru_telubon_dukuwatirotome.pdfIn PDF document text
    • https://marepevu.weebly.com/uploads/1/3/4/3/134309524/bibopa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425255/normal_5fc0d5c04f74a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390996/normal_5fb853c67da3b.pdfIn PDF document text
    • https://jazelisis.weebly.com/uploads/1/3/4/8/134870131/5c482116d.pdfIn PDF document text
    • https://bomaripuxizidul.weebly.com/uploads/1/3/4/9/134901287/tumininofofaro_bobamawex_fabutoxezad_gumoxajevop.pdfIn PDF document text
    • https://xebazasasixuj.weebly.com/uploads/1/3/4/6/134641459/2d42c5c045e79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365549/normal_5f875c0c262e3.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/zunaduxa/assassin_s_creed_apk_obb.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd077cdae50a014588b090/1606223740564/aeries_capousd_parent_portal.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fcf464dcd9942793f27148f/t/5fd1cfc4880fa23343d5158e/1607585734911/42848144069.pdfIn PDF document text
    • https://s3.amazonaws.com/xeropizuwe/67213420054.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_off0000c329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC329 5012 bytes
SHA-256: 4cf34452a90ff73ec8168975317ffc16b64f2b04d80c6c5032709ba4daf7c14a
font_01_sfnt_off0000d44b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD44B 10504 bytes
SHA-256: 5ae06ca4a724702a5578677b6d99891b72a225cae55c915cf92f334abcf7d78e

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