Malicious PDF — malware analysis report

Static analysis result for SHA-256 19c57bcb22234713…

MALICIOUS

PDF

72.3 KB Created: 2020-12-26 13:03:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: fe64ef3bb649054ba875086d261eee3d SHA-1: e20f0bd106344a3200eb2ebc60d12d5949c94d14 SHA-256: 19c57bcb222347139aadef6e69d0c6fad14240cd9cf3bc4ba93b41fdb20c54a2
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm. One critical heuristic indicates a direct link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffmen.ru/strik?utm_term=zombie+dying+island+survival+guide In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367656/normal_5f89757c4ad04.pdfIn PDF document text
    • https://lifotuvuzaraxur.weebly.com/uploads/1/3/0/7/130775275/fewuzam-vesadinitejufib-fovewifejin.pdfIn PDF document text
    • https://zagukosi.weebly.com/uploads/1/3/4/3/134314994/tozetexevubo-tevezox-welumaju.pdfIn PDF document text
    • https://sobexezawatu.weebly.com/uploads/1/3/4/9/134903145/aed2704393f2a1c.pdfIn PDF document text
    • https://nekamijej.weebly.com/uploads/1/3/4/6/134633096/lanamabozadatot.pdfIn PDF document text
    • https://duvujisukodat.weebly.com/uploads/1/3/4/6/134674851/061a25ae.pdfIn PDF document text
    • https://cdn.sqhk.co/sejujona/94ggYgd/stack_buffer_overrun_c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386366/normal_5fda0048a3ed9.pdfIn PDF document text
    • https://cdn.sqhk.co/ditetona/KhcmifE/amazeballs_recipe_fitnessista.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471475/normal_5fe68aead1329.pdfIn PDF document text
    • https://dinumaditu.weebly.com/uploads/1/3/4/4/134479473/5947257.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389085/normal_5f9895c6a503b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468289/normal_5fe4f065b3448.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426408/normal_5fbf638a39acf.pdfIn PDF document text
    • http://go.usa.goIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000de11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE11 5404 bytes
SHA-256: 2eb9f3ca7d1ad1c643c6c0de58c70fb4f19db5b6e00a45ac88b5078608054897
font_01_sfnt_off0000f068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF068 10376 bytes
SHA-256: 02d7bbd81a1697b9b47d2d784d82a33799b02fbc60baa922830fd8808fbec70e

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