Malicious PDF — malware analysis report

Static analysis result for SHA-256 be1316e62cb7113f…

MALICIOUS

PDF

75.0 KB Created: 2021-04-25 22:20:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: f8a072cffdb99a21122718ec8b4af93f SHA-1: 7d48a7a9379c2f633aaf67f1a75bd1d1f92bcabb SHA-256: be1316e62cb7113f4921a3d653b937e9773b1f8bda7ea612287846d80a8e470d
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous external URLs, many of which are part of a link farm hosted on disposable domains, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, appears to be a lure related to technical information, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jottigo.ru/strik?utm_term=how+to+hard+reset+a+kenmore+microwave PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4387421/normal_5feeb4497511a.pdfIn PDF document text
    • http://wonnaturila.space/zagomutoq5b.pdfIn PDF document text
    • http://jirenaxapibetig.scienceontheweb.net/capacitors_physics.pdfIn PDF document text
    • https://kotimoxita.weebly.com/uploads/1/3/4/8/134878992/fesuragopej-naromat.pdfIn PDF document text
    • http://dabopoxele.getenjoyment.net/netbeans_java_gui_builder_tutorial.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422135/normal_603ad08f5412b.pdfIn PDF document text
    • http://lnstagram-office.com/jelazopamezulapesnafq.pdfIn PDF document text
    • http://izzzaaa.space/pasixobirutivagct5c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445736/normal_60021aa5e863b.pdfIn PDF document text
    • https://xomitemekebok.weebly.com/uploads/1/3/4/8/134881854/wiwanaduzamikap.pdfIn PDF document text
    • http://iminn.ru/harrison_bergeron_kurt_vonnegut_storys2vmr.pdfIn PDF document text
    • http://mazisim.mywebcommunity.org/konversi_file_ke_word.pdfIn PDF document text
    • http://gonuzigodu.iblogger.org/benzotriazole_synthesis.pdfIn PDF document text
    • http://yazansoft.com/tejofuxuoz2j4.pdfIn PDF document text
    • https://kumapeforurimo.weebly.com/uploads/1/3/4/6/134664671/mulubu_gizexobafazir_refofi_mejozidopobok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495694/normal_6052dc82db725.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472491/normal_6058b5bf0ab37.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462730/normal_5ffcfe96ecf86.pdfIn PDF document text
    • https://viduxetejogat.weebly.com/uploads/1/3/4/6/134600114/mozeveloselugizi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474222/normal_60318ceff2ba7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://legumanob.rf.gd/4180502593.pdfIn PDF document text
    • http://kitawijarital.epizy.com/lexak.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_off0000e9f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F8 5324 bytes
SHA-256: ca9bc1daa89f5d914bd929fbcb66dd37ff9c412009892530337c503fe0678c72
font_01_sfnt_off0000fbff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFF 10132 bytes
SHA-256: 4feba75e95e18fb7ea273abf32cee4909df04a7d7cf74ecc8f97f3af4ffd4f2b

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