Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1642bd1b74d4ee7…

MALICIOUS

PDF

76.0 KB Created: 2021-05-24 10:45:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: af4a9f2c3c0e5ea97e29ed3ca33798a9 SHA-1: bc73c11aafebaf85d4a17e85ab9b744522e82d03 SHA-256: a1642bd1b74d4ee79e50285dedd0b2ecfae062bf3f023ec14811469426d5e792
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 a high-severity heuristic indicating it is a phishing lure, using an image to redirect users to a malicious URL. The ML classifier and ClamAV also flagged this file as malicious. The embedded URL https://nipisod.ru/strik?utm_term=how+does+a+prenup+work+in+south+africa is the primary IOC, likely leading to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://nipisod.ru/strik?utm_term=how+does+a+prenup+work+in+south+africa PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368501/normal_6057eb5ff3382.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403128/normal_5ffcdffa700ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379987/normal_604a591d9c187.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386091/normal_606730a6af77b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380528/normal_5fc92db6ed722.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460048/normal_60031c5e9ca7a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451225/normal_6021782a44b09.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384301/normal_5fddf0801d9ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391013/normal_604d4502e1c50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497368/normal_606ae14473e74.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482415/normal_60279d54647b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465702/normal_60178367ab70d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379854/normal_60530536c05d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456687/normal_600e4453d63bd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458145/normal_60055eef5d882.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453563/normal_6052b0c9f3ae8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379362/normal_6022340625c43.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419002/normal_5fda93e465e44.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/xirixepo/the_notebook_ebook_download.pdfIn PDF document text
    • https://s3.amazonaws.com/benuka/arellano_university_malabon_uniform_senior_high.pdfIn PDF document text
    • https://s3.amazonaws.com/diwitapezu/zozepevazawuvuvemi.pdfIn PDF document text
    • https://s3.amazonaws.com/kefiperizonofu/88722293429.pdfIn PDF document text
    • https://s3.amazonaws.com/zuvovoxigumuz/email_template_design_html_free.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_off0000ea91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA91 5328 bytes
SHA-256: 1d54d0063d5083b82b47e88a82a372a94c9419fbbd319939055dec435f00e171
font_01_sfnt_off0000fcc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC1 10464 bytes
SHA-256: 02be1a526b139cbfff928597e13cca12df18a9aafc09f6f2a4c334d9e9a1b19e

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