Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e10978b432ec846…

MALICIOUS

PDF

75.0 KB Created: 2021-02-25 09:59:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 392d2f1b9f543fc1b55fc300dc1df4c8 SHA-1: 083c949580b16e08e367a14d3897d3cda645150d SHA-256: 9e10978b432ec846cc46c52e7954959715babe0b90b0136d1b73d77b28c6fbd2
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many pointing to link farms and redirectors, indicating a phishing or malware distribution scheme. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_UTM_REDIRECTOR_LINK' strongly suggest this. The embedded URLs, such as 'https://druttle.ru/123?utm_term=is+dumbledore+one+of+the+3+brothers', are likely used to redirect victims to malicious sites. The ML classifier and ClamAV detection further support the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://druttle.ru/123?utm_term=is+dumbledore+one+of+the+3+brothers PDF link annotation
    • https://xomowozijirogap.weebly.com/uploads/1/3/4/6/134667332/buviwivavaxez.pdfIn PDF document text
    • http://kupelobivinix.22web.org/58434768190.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420760/normal_6014b13419c1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453579/normal_600cabf6904d0.pdfIn PDF document text
    • https://wakuwuwosabi.weebly.com/uploads/1/3/0/7/130776519/verisire_jobibik_dazitaxoj_nekufuvezuwaxe.pdfIn PDF document text
    • http://vixesun.iblogger.org/north_atlantic_treaty_organization_nato_purpose.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/xalexojaxipud/shirt_template_png_roblox.pdfIn PDF document text
    • http://bumumewevebav.epizy.com/36856364956.pdfIn PDF document text
    • https://s3.amazonaws.com/dipafuxe/1220445246.pdfIn PDF document text
    • https://s3.amazonaws.com/gazivemon/chemistry_a_molecular_approach_textbook.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwamoxamo/romotisu.pdfIn PDF document text
    • http://rudurugineme.epizy.com/ketiruzafilidowisuzowa.pdfIn PDF document text
    • https://s3.amazonaws.com/pazatuv/7931503151.pdfIn PDF document text
    • http://fexomuwitoxe.rf.gd/32511813708.pdfIn PDF document text
    • https://s3.amazonaws.com/kifutizijebuj/b_f_g_telugu_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/niporofez/video_from_facebook_messenger_to_phone.pdfIn PDF document text
    • https://s3.amazonaws.com/mekonulegipero/5454089101.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_off0000e941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE941 5176 bytes
SHA-256: 6782383b3e9f95bba16b450e93a8df662a5593312df5a430cd5895d7a464dc4d
font_01_sfnt_off0000faaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAF 10576 bytes
SHA-256: 8209e8cafee49096edb820161c13ab571a9cc03257f01131e43bc7c38f8ba317

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