Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3e8cbbce18d16c0…

MALICIOUS

PDF

80.3 KB Created: 2021-04-03 15:53:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: ddcab1f7c31a8b3f659e083264c4ebf9 SHA-1: d81b72a136e253882876994beccb93c0ca1e8cee SHA-256: a3e8cbbce18d16c0569ad5635aab240293505cb1d06c01ca8f2f704fca284b56
126 Risk Score

Malware Insights

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

The file is a PDF containing numerous embedded URLs, many of which point to disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites, potentially for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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.
  • 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://maypoin.ru/wix?keyword=pub+4012+pdf PDF link annotation
    • http://mujoxoluvisukid.getenjoyment.net/classification_of_asthma.pdfIn PDF document text
    • http://tofosasolamet.iblogger.org/98110281453.pdfIn PDF document text
    • https://posofipijetudu.weebly.com/uploads/1/3/1/3/131380531/4066058.pdfIn PDF document text
    • https://pegojuzifaxoda.weebly.com/uploads/1/3/5/3/135309499/xurofizozugabax.pdfIn PDF document text
    • http://todiluz.22web.org/nomatenemagime.pdfIn PDF document text
    • http://moxegelubopidi.sportsontheweb.net/a_night_out_form_2.pdfIn PDF document text
    • http://rulogojaratimad.22web.org/7122708519.pdfIn PDF document text
    • http://xizerunax.scienceontheweb.net/dipasi.pdfIn PDF document text
    • https://xokubimekitogi.weebly.com/uploads/1/3/5/9/135986234/mejitabojor.pdfIn PDF document text
    • https://gogalafubixuvu.weebly.com/uploads/1/3/4/6/134642314/rubudinumejo-moketeb-buminiwobide.pdfIn PDF document text
    • https://kuvixirizu.weebly.com/uploads/1/3/0/7/130739951/xudipisevibupuf.pdfIn PDF document text
    • https://cdn.sqhk.co/remezebona/IojePWV/bejeweled_classic_para_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/jamosolil/hHQC9wh/catheter_associated_dvt_chest_guidelines.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://judiserod.onlinewebshop.net/35106812415.pdfIn PDF document text
    • https://s3.amazonaws.com/feborobegibew/vokoxebiruper.pdfIn PDF document text
    • https://s3.amazonaws.com/potamotaz/35022738922.pdfIn PDF document text
    • http://kusuganuxe.epizy.com/comment_reunir_2_en_un_seul.pdfIn PDF document text
    • http://sodanone.rf.gd/tratados_internacionales_firmados_por_mexico.pdfIn PDF document text
    • https://s3.amazonaws.com/silubebebefuju/91940156857.pdfIn PDF document text
    • http://poxizaxo.epizy.com/mahalaxmi_calendar_november_2020.pdfIn PDF document text
    • http://lusajafimaneru.myartsonline.com/is_mechanical_engineering_a_good_major.pdfIn PDF document text
    • https://s3.amazonaws.com/mesixadelomomo/tawesuduxivon.pdfIn PDF document text
    • http://metepukiwameme.epizy.com/88872858601.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_off0000faff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFF 5076 bytes
SHA-256: 3a55313b6b9488a3413d376170eee1c1b5b9ffbe23c0900ed1e50982b549a585
font_01_sfnt_off00010c6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C6A 11896 bytes
SHA-256: 111b1846d0c6a10184ed9611b6ca9a0f1eed484f08b2b8d9af678649f6db759c

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