Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef43927311017091…

MALICIOUS

PDF

96.7 KB Created: 2021-03-15 09:14:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 564228aa2f59d02e871422cb9cf73642 SHA-1: 50eb0a8268dc1e176b711e3fbcfbb479e5292007 SHA-256: ef43927311017091d80c38b160c63c1f95e87a74bfaae864c928f4da772032c2
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically identified as a malicious link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were extracted, the PDF structure and embedded URIs suggest an attempt to redirect the user to a compromised or malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://gimoguvi.ru/strik?utm_term=envizen+digital+tablet+won%2527t+turn+on PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4422161/normal_60215d97c107c.pdfIn PDF document text
    • https://cdn.sqhk.co/vagofedewat/juthfJd/28991472384.pdfIn PDF document text
    • http://gejudoxe.mypressonline.com/kikukigi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407327/normal_5fe4063832117.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446168/normal_5fe84b5d9f8a3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499309/normal_60035fd5a61c2.pdfIn PDF document text
    • http://nesebonuvobeju.getenjoyment.net/53240602238.pdfIn PDF document text
    • http://lowufadit.scienceontheweb.net/22731691633.pdfIn PDF document text
    • https://cdn.sqhk.co/bofagenined/glxKcbD/costco_callaway_golf_balls_review.pdfIn PDF document text
    • https://cdn.sqhk.co/gupetipek/3lhaihT/disney_themed_island_animal_crossing_dream_address.pdfIn PDF document text
    • https://cdn.sqhk.co/jugomuzuteb/fDZOkOp/2624708288.pdfIn PDF document text
    • http://nedavupagisezim.mygamesonline.org/limites_de_funciones_complejas_ejercicios_resueltos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492245/normal_60489d97755dc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://gifonuva.epizy.com/how_to_sew_a_pioneer_bonnet.pdfIn PDF document text
    • https://s3.amazonaws.com/jajoxulabojaso/counseling_case_conceptualization_template.pdfIn PDF document text
    • https://s3.amazonaws.com/geradi/isometric_piping_drawing_software_free.pdfIn PDF document text
    • http://wegemejejo.epizy.com/e_coli_and_total_coliform.pdfIn PDF document text
    • https://s3.amazonaws.com/sojebelevenex/massey_aegrotat_form.pdfIn PDF document text
    • http://fagobokaxipa.rf.gd/monday_stock_market_open_or_close.pdfIn PDF document text
    • http://rojelolazekozox.rf.gd/67001952574.pdfIn PDF document text
    • http://bajobakokela.epizy.com/83404206930.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012fbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FBC 5028 bytes
SHA-256: 6c704cc0241e922d4174afa1b5a4d43b19bb33e14b428bae2b5d92d6ccb08921
font_01_sfnt_off00014104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14104 11280 bytes
SHA-256: d0ddb5e09408ab1c49f783b8fc4ac0c2c20259ac61f6f704010ee1e12b20b549
font_02_sfnt_off00016759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16759 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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