Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccdb458de9336733…

MALICIOUS

PDF

77.2 KB Created: 2021-02-28 09:37:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 6a75d979c1f0d42de0a72d762a087328 SHA-1: d9e43b9c7d17cf6165dfab58e6c1889722e710f6 SHA-256: ccdb458de9336733b74564918eb49bc5c93cb618fd6be44d746fd6d713af58ae
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated, but the presence of embedded URLs and the heuristic firings suggest a phishing or redirection attack pattern.

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://crophysi.ru/strik?utm_term=breville+toaster+oven+bov650xl+canada In PDF document text
    • http://centerbluebadge.com/11969619376yl4q8.pdfIn PDF document text
    • http://burutevopu.iblogger.org/avira_antivirus_latest_trial_version_free.pdfIn PDF document text
    • http://presentinsta.online/sama_veda_sandhyavandanam_in_englishnrihf.pdfIn PDF document text
    • https://jomigivava.weebly.com/uploads/1/3/5/3/135330213/8bc8627e412.pdfIn PDF document text
    • https://xemubafuwifo.weebly.com/uploads/1/3/4/4/134475424/tefududonamovolekero.pdfIn PDF document text
    • http://vugekowuzujed.scienceontheweb.net/fadobatuj.pdfIn PDF document text
    • http://dunizajo.66ghz.com/84038068708.pdfIn PDF document text
    • http://copyright-helps-team.com/duraflame_3d_infrared_electric_fireplace_stove_with_remote_control_-_dfi-501012mew.pdfIn PDF document text
    • http://wotimijivebizu.iblogger.org/vuvesajexovubevi.pdfIn PDF document text
    • https://tokuzulovaw.weebly.com/uploads/1/3/0/7/130740221/xulidolelumamofuvas.pdfIn PDF document text
    • http://infonewstravel.com/arguments_and_arguing_3rd_edition_freeyd6nj.pdfIn PDF document text
    • http://vobalemujumojak.mywebcommunity.org/lipufez.pdfIn PDF document text
    • http://worldthailand.fun/14020514999the2w.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sinodigewenewe.rf.gd/waxomujipi.pdfIn PDF document text
    • http://jesasudazewur.epizy.com/maremuwowatalalalukeparus.pdfIn PDF document text
    • http://dobifagamuwu.rf.gd/mixokod.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_off0000efc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC1 5672 bytes
SHA-256: 97d09e1d9f56dc0383e2725313e895ea003c353b9a1ee977ae72774923a437df
font_01_sfnt_off00010320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10320 10976 bytes
SHA-256: 06ebcc38d00e3effcb98e197cc407801bfed89579e2144d8b316fce35cd81732

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