Malicious PDF — malware analysis report

Static analysis result for SHA-256 952707de00a08001…

MALICIOUS

PDF

73.3 KB Created: 2020-11-18 01:05:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8991928acd6300306b8c8a1ce345dec SHA-1: 17bcdb9ba7086ac3efff3d24d1d112360b59bf3f SHA-256: 952707de00a080013998323ca33690e4d7a35fc73de11c5dac15b4e6b4743fc3
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to disposable domains and known malicious redirectors. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gettraff.ru/123?utm_term=finish+the+picture+psychology+worksheet
    • https://tokunebejuz.weebly.com/uploads/1/3/4/3/134323577/pezozonakat.pdf
    • https://dimaxafazeza.weebly.com/uploads/1/3/1/4/131453031/kezedivalo-bolumukejufufik.pdf
    • https://tugajepefur.weebly.com/uploads/1/3/1/4/131453805/kusig.pdf
    • https://pudukodup.weebly.com/uploads/1/3/1/4/131407572/xonedoxofagobebomi.pdf
    • https://cdn-cms.f-static.net/uploads/4416661/normal_5f9b935dc0d07.pdf
    • https://gokopawe.weebly.com/uploads/1/3/4/4/134493337/lanaxutodi.pdf
    • https://cdn-cms.f-static.net/uploads/4461234/normal_5fa4ec4ce191b.pdf
    • https://toxekemugig.weebly.com/uploads/1/3/4/4/134484635/bed343a.pdf
    • https://cdn-cms.f-static.net/uploads/4382949/normal_5f8e27cf1e4b7.pdf
    • https://cdn-cms.f-static.net/uploads/4488822/normal_5fad43bba3a67.pdf
    • https://cdn-cms.f-static.net/uploads/4388041/normal_5faa7be529660.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/turip/xewixutepewozosumusutob.pdf
    • https://s3.amazonaws.com/wuzalugiseto/xujusunejoxojuwigi.pdf
    • https://uploads.strikinglycdn.com/files/203e872d-036c-4d40-b17f-998170052e4c/zexakipofitenojepafuw.pdf
    • https://uploads.strikinglycdn.com/files/a186dab3-ed57-43ef-8a3e-7665ef31028f/52891696128.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de75.bin
8363ee14bf5d7a95510df4501a768d67982dcaf9402a1202e2534c473df1502c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE75 5200 bytes
font_01_sfnt_off0000f042.bin
7b6c0db35c71f25d6f4d6d6053e910f8d40b82c34d645b44f59999d22fbb1b36		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF042 11876 bytes

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