Malicious PDF — malware analysis report

Static analysis result for SHA-256 c77855d5e9958ced…

MALICIOUS

PDF

82.9 KB Created: 2021-05-15 11:20:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: e584f0e22674daf6965509c6da90a306 SHA-1: 983c75d4321b010f29eb307eb647d7c3c12352ac SHA-256: c77855d5e9958cedd51540a865851af702d1936de4951efb932afec199e47cee
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains heuristics indicating it is a phishing lure, specifically using an image to redirect users to an external URL. The embedded URL `https://resalured.ru/strik?utm_term=hawaii+state+id+format` is flagged as a high-risk redirector. While no scripts were explicitly extracted, the PDF structure and the nature of the URL suggest an attempt to deliver a malicious payload or phish for credentials.

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
  • 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.
  • 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://resalured.ru/strik?utm_term=hawaii+state+id+format PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4501774/normal_5feb9d35b8db7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465010/normal_6007ed2cdf238.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451575/normal_5febc6b8b2918.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384150/normal_5ff8398f60a19.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446388/normal_5fe5806ca7786.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415937/normal_6061e2c899f9e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390661/normal_5fd633c59161a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471971/normal_600bd4f00dc01.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413008/normal_60462aad7a03b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387825/normal_605bb32abeeae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365626/normal_6010e82b519c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419828/normal_603ebb3368491.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450421/normal_60355b0990fc4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471509/normal_5fe786b09915f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421058/normal_5ff66dc65cf48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393754/normal_605c140e64957.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459467/normal_5ff0617ee0225.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bidemewufa/arlo_netgear_software.pdfIn PDF document text
    • https://s3.amazonaws.com/loneminovu/a_arte_de_amargar_a_vida_paul_watzlawick.pdfIn PDF document text
    • https://s3.amazonaws.com/dowavelaxam/kudujirusobidofupofasag.pdfIn PDF document text
    • https://s3.amazonaws.com/wutezigojuxi/24272469354.pdfIn PDF document text
    • https://s3.amazonaws.com/tisegovofu/dunkin_donuts_medium_french_vanilla_iced_latte_calories.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_off000107a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A8 5072 bytes
SHA-256: 68e04384aac236bc3f330237c0c7252e897d4be61ae6c19cec2a62d0f61bf50a
font_01_sfnt_off000118e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E5 11008 bytes
SHA-256: 006526fa3d730f77ccf5c5aa8a1c35751620a6ebff821a9b8c08191ccf1b37e3

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