Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc8c7377f8a9e3a3…

MALICIOUS

PDF

76.2 KB Created: 2021-04-02 18:16:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: f211b7ff836214f8d3da75eaefde3d63 SHA-1: 1271350ae19bc6e5bc60e198ac366339c74c243e SHA-256: cc8c7377f8a9e3a39782293182cd8de7c55455b2318273b8d1dedca0dedbdd1d
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many of which are part of an SEO link farm designed to redirect users. The primary lure appears to be a search result for 'En que acaba cien años de soledad', directing to a suspicious URL. ClamAV and ML classifiers also flagged this file as malicious, indicating a phishing or trojan distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://seumenha.ru/strik?utm_term=en+que+acaba+cien+a%25C3%25B1os+de+soledad PDF link annotation
    • https://suwesinorilofev.weebly.com/uploads/1/3/4/0/134096988/2853748.pdfIn PDF document text
    • http://fupefabesosada.mygamesonline.org/statistical_quality_control_montgomery_book.pdfIn PDF document text
    • https://ludalobupum.weebly.com/uploads/1/3/4/5/134528654/2909445.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426820/normal_5ff87d40cdd40.pdfIn PDF document text
    • http://duzusedolatepe.mypressonline.com/dezukikagixodora.pdfIn PDF document text
    • http://luxomozuk.mypressonline.com/warojulano.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385869/normal_60391d0a63244.pdfIn PDF document text
    • https://gamajebijapam.weebly.com/uploads/1/3/1/8/131856653/bunexagisotud_pamibumonegapof.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/mejawiwomak/dental_caries_journal_2017.pdfIn PDF document text
    • http://mifojizu.myartsonline.com/30689634183.pdfIn PDF document text
    • https://s3.amazonaws.com/wulagisi/kezawaw.pdfIn PDF document text
    • https://s3.amazonaws.com/timeziso/xolod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33ac4330-ff38-4dc2-b0c9-aef3e7674827/tavunegigefojezen.pdfIn PDF document text
    • https://s3.amazonaws.com/dezajok/fepitepebaxexatipilo.pdfIn PDF document text
    • https://s3.amazonaws.com/fidefofudi/wojezipatanu.pdfIn PDF document text
    • https://s3.amazonaws.com/biwubeleba/international_acid_rain_information_centre_wiki.pdfIn PDF document text
    • https://s3.amazonaws.com/waduzirader/what_exercises_can_i_do_to_help_plantar_fasciitis.pdfIn PDF document text
    • http://ligoroxenafof.atwebpages.com/liluwemuvup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ff622e2-19f1-49d6-b6a9-6ef1f7a28ee2/mopavikufutaku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5e1cb8e-a834-48ae-9b02-633af09c9a9f/livipifowaleki.pdfIn PDF document text
    • https://s3.amazonaws.com/faduxodiwo/libro_el_color_de_mis_palabras.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_off0000ebc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC1 5272 bytes
SHA-256: 32ce0992976c70ee83268cd658e35c30e11e3bdc7aaf38bea082f2a4bd77845f
font_01_sfnt_off0000fd7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7E 11100 bytes
SHA-256: 727e5e59e03e7b7d027d72bd8e992965763a91c06cbef4d41f51150439346252

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