Malicious PDF — malware analysis report

Static analysis result for SHA-256 918b9f078dc6792c…

MALICIOUS

PDF

81.5 KB Created: 2021-04-07 20:30:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 1372f9385e5aa2ad137aa896ef27ba5c SHA-1: c9230a18c2c685d9b4f5a6fcbc59285af4338d3c SHA-256: 918b9f078dc6792c4746cb269a33236b4ab566ede29fe36b3dfff6f0d43e756c
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a link disguised with a seemingly legitimate query about WiFi extenders, which is a common lure for phishing or malware delivery. Heuristics indicate the link points to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://dafemum.ru/strik?utm_term=how+to+setup+verizon+fios+wifi+extender In PDF document text
    • http://fefiwizam.sportsontheweb.net/rovetopinabamuzufuxa.pdfIn PDF document text
    • http://mekikapuleka.22web.org/berserk_manga_descargar.pdfIn PDF document text
    • http://vonexalux.sportsontheweb.net/curriculum_meaning_and_concept.pdfIn PDF document text
    • http://bowuvudofi.scienceontheweb.net/naphthalene_acetic_acid.pdfIn PDF document text
    • http://walolexokesufa.sportsontheweb.net/zuxinililojivezuxob.pdfIn PDF document text
    • http://kowojolajamuv.getenjoyment.net/windows_7_microsoft_print_to.pdfIn PDF document text
    • http://fisitupogavi.mypressonline.com/harley_davidson_service_manuals_for_sale.pdfIn PDF document text
    • http://ruwemaroxi.22web.org/kalerisajotebukebu.pdfIn PDF document text
    • http://nizeguz.iblogger.org/kings_quest_4_play_online.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vidilig.onlinewebshop.net/visual_data_storytelling_with_tableau.pdfIn PDF document text
    • https://s3.amazonaws.com/gurowozenupifi/xejosolibodojagalelu.pdfIn PDF document text
    • https://s3.amazonaws.com/sojebelevenex/kunonujivivoporase.pdfIn PDF document text
    • http://kejagabato.myartsonline.com/vetufofe.pdfIn PDF document text
    • https://s3.amazonaws.com/kozibowisenatu/spreadsheet_template_for_monthly_expenses.pdfIn PDF document text
    • https://s3.amazonaws.com/tawovojo/south_carolina_medicaid_managed_care_enrollment_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/152fc300-4059-4265-ab89-807283f9742e/72492902271.pdfIn PDF document text
    • https://s3.amazonaws.com/gekixadonuru/84038303529.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cc7ea2e-019f-4edb-8fdc-523703dfb044/jotego.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63f39641-9b84-499d-b6d3-21420e187290/tolubokokotoderef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b817db5d-3dc3-4680-8bc2-191fccdcc98d/what_is_keyboard_definition_in_english.pdfIn PDF document text
    • http://fulawumobolofog.epizy.com/esl_english_worksheets.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_off000104c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C5 5024 bytes
SHA-256: edffb85909d8633c23662e7b31797684c8f66d6805fec0a556bd537679e3b584
font_01_sfnt_off00011612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11612 10152 bytes
SHA-256: 5198be2e60c8f891fa9ad6fb58d48f4ec6667dc229501794cfdd6e9b8913357a

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