Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a8d73bdeae5a4cf…

MALICIOUS

PDF

71.8 KB Created: 2021-02-24 06:51:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 55561087b348901f3d1477b126aee209 SHA-1: b08594398fac343168d65f127080807380bbe898 SHA-256: 9a8d73bdeae5a4cf3d92d3e7db31bec6381f3a2af3cb55313dafbb5dcb475542
184 Risk Score

Malware Insights

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

The PDF contains embedded links that point to known malicious redirector infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs. The primary attack pattern involves redirecting users to external sites, likely for phishing or to download further malicious content.

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 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://yafferge.ru/strik?utm_term=fantastic+beasts+and+where+to+find+them+book+movie In PDF document text
    • https://cdn.sqhk.co/nejisakatok/jahajbY/55373892721.pdfIn PDF document text
    • https://gareketekefebon.weebly.com/uploads/1/3/4/6/134695024/xezopof-likug.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425926/normal_5ffe2b1746ad8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420902/normal_6031f5718bd99.pdfIn PDF document text
    • http://tibojisitixuno.22web.org/wadedukigi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448100/normal_600cf29fbc3de.pdfIn PDF document text
    • https://xomivumikeso.weebly.com/uploads/1/3/0/7/130774979/f957a65cb0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426541/normal_5ff4d61aa0fff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470839/normal_6022842354259.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fawujuvuz.epizy.com/naa_autograph_movie_songs_free_telugu.pdfIn PDF document text
    • http://wexuboguke.epizy.com/ark_metal_tree_platform_cheat.pdfIn PDF document text
    • http://wolaniloko.epizy.com/17736751938.pdfIn PDF document text
    • http://dunurabese.rf.gd/jiguvufevevaza.pdfIn PDF document text
    • http://bakefedov.epizy.com/sennheiser_ew_300_iem_g3_transmitter.pdfIn PDF document text
    • http://zunonaselopa.rf.gd/82123327608.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_off0000da8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8D 5540 bytes
SHA-256: c584f082785bff6b3d732d56f06a7ae490c7b8902b3a1aaccedfd62ec6a31763
font_01_sfnt_off0000ed4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4F 10724 bytes
SHA-256: 1e1d18dff924f8445b019836f8c0a66177957235c904965a289313dcc119e814

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