Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f51c9266c527d8b…

MALICIOUS

PDF

77.2 KB Created: 2021-02-20 01:44:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: c6ef08af4e8d7d4ce552f44ba1619552 SHA-1: 2c76103ca38ac6c757a0bdd301a5c08ecca71183 SHA-256: 7f51c9266c527d8bf2f0f5190ecd3716df913c1d099185276c6d93a5d849321d
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, many pointing to disposable hosting, and is identified as a link farm. The presence of embedded URLs suggests an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://druttle.ru/strik?utm_term=dell+inspiron+5700 PDF link annotation
    • http://vuxokiwi.22web.org/jobuzibapixutezoje.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475859/normal_5ff1f4d177a41.pdfIn PDF document text
    • http://rolevuses.iblogger.org/pencil_animation_software.pdfIn PDF document text
    • http://faromobipon.22web.org/instagram_video_link_online.pdfIn PDF document text
    • https://vozozexofevufut.weebly.com/uploads/1/3/1/8/131871902/5801989.pdfIn PDF document text
    • http://zitokik.iblogger.org/fesuwasikidesiwukad.pdfIn PDF document text
    • http://rufukukarekarut.22web.org/what_did_trevor_text_tessa_in_after_we_collided.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473388/normal_5feef87a40ab4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393776/normal_5fe0eff07244d.pdfIn PDF document text
    • https://menosakisidibus.weebly.com/uploads/1/3/5/3/135391165/6580940.pdfIn PDF document text
    • http://sujatafuluwariv.22web.org/maritime_navigation_apps_android.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://garubokiboja.rf.gd/vepiribinuvij.pdfIn PDF document text
    • http://vufagozujidivu.epizy.com/teknik_akuntansi_keuangan_sektor_publik.pdfIn PDF document text
    • https://s3.amazonaws.com/fadobirak/3d_building_elevation_software_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jukezeluf/flower_frame_background_images.pdfIn PDF document text
    • https://s3.amazonaws.com/towutoginadivu/89163136517.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_off0000f14f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14F 4948 bytes
SHA-256: 7ad51ee9b392dfd7d5a02ba06fb0b6087eac201c46d0affad74338c0ef981689
font_01_sfnt_off00010248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10248 11024 bytes
SHA-256: 4708d231e82fa15e734f27210131a63f8f75e77e6fd5c9a3c1d4ded57b1e1dba

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