Malicious PDF — malware analysis report

Static analysis result for SHA-256 b72627f096e0be24…

MALICIOUS

PDF

66.2 KB Created: 2021-02-15 22:30:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: cca4c2c56a89b5a66aeec31f01467a2e SHA-1: 6b916ae5135d1d8ade3f38eaf90f25306b07a5d1 SHA-256: b72627f096e0be24f920d97e65526fff300d91bf14ca865d5736b5b38eafbb06
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics indicate it contains a mass of external links, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to potentially harmful websites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://leonvi.ru/123?utm_term=where+is+the+thermostat+located+on+a+2012+dodge+avenger PDF link annotation
    • https://pibusabet.weebly.com/uploads/1/3/4/6/134695111/wigobanej_dalubof_dudekonab_kazidovanagan.pdfIn PDF document text
    • https://zokaguwozan.weebly.com/uploads/1/3/0/7/130738936/domabakep.pdfIn PDF document text
    • https://gitapelo.weebly.com/uploads/1/3/2/6/132682700/0581fe333fc.pdfIn PDF document text
    • http://gajozemexip.22web.org/championship_manager_free_for_android.pdfIn PDF document text
    • https://pidowiwosuzaji.weebly.com/uploads/1/3/0/9/130969191/xetesedikeges-kekekiz.pdfIn PDF document text
    • http://bozigojinodebux.iblogger.org/maniga.pdfIn PDF document text
    • https://kokujefep.weebly.com/uploads/1/3/1/4/131409677/xipubujibefokexo.pdfIn PDF document text
    • http://jodesomuxuduzu.22web.org/rezipowiwofatupotoruzix.pdfIn PDF document text
    • https://jinepesel.weebly.com/uploads/1/3/5/3/135346763/6293662.pdfIn PDF document text
    • http://tujozavido.66ghz.com/99098852632.pdfIn PDF document text
    • https://cdn.sqhk.co/zoboxoba/hhfZrgf/her_story_steamunlocked.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://luturuwuxas.epizy.com/80519237487.pdfIn PDF document text
    • http://suginuzebaluwom.rf.gd/tamil_movie_2018_tamilrockers_app.pdfIn PDF document text
    • http://sinalowus.epizy.com/beekeeping_basics_penn_state.pdfIn PDF document text
    • http://nugikefabepumuk.epizy.com/nugetifekuguvemoxufilogu.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_off0000c056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC056 5752 bytes
SHA-256: 464c083f7725900160f18ff0e1fb73b3593c215a9be6b2668299affbef9971b2
font_01_sfnt_off0000d3d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D2 11092 bytes
SHA-256: 74cf078dd7a4dc3ae230993d4c94e45eff6f0294a9034db8bfab913358465072

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