Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1962a7745b6d2bc…

MALICIOUS

PDF

73.8 KB Created: 2021-02-24 11:43:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: eded4099e1621c9b85d34aacfddd10a5 SHA-1: b4efd228c298871bf936586636c44a707144cb09 SHA-256: f1962a7745b6d2bc5789d0aa43b31098b4a4ee4e39ad9c6bae68c7a749b476ec
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a lure referencing 'Skyrim stony creek cave treasure map' and a high-confidence heuristic indicates it's an SEO redirector for free-download phishing. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URI point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/wix?keyword=skyrim+stony+creek+cave+treasure+map PDF link annotation
    • https://cdn.sqhk.co/nedabuke/hgihDib/21634640117.pdfIn PDF document text
    • https://cdn.sqhk.co/labojime/aFjhAfx/download_game_glory_of_generals2_ace_mod_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455180/normal_5ff4706d6cbb6.pdfIn PDF document text
    • https://cdn.sqhk.co/wupetutigo/hivaij8/bijisanusi.pdfIn PDF document text
    • https://cdn.sqhk.co/gegefemorosu/ciijhSV/chinese_pottery_artifacts.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446162/normal_5fd2d3083249a.pdfIn PDF document text
    • https://cdn.sqhk.co/gidenateg/7ruahfV/62712293908.pdfIn PDF document text
    • https://cdn.sqhk.co/mikakiraw/pV0rSjb/velodyne_lidar_inc.__vldr.pdfIn PDF document text
    • https://cdn.sqhk.co/vuzowadijavu/ggEgjhg/97347611392.pdfIn PDF document text
    • https://cdn.sqhk.co/masamiwe/S30LkqL/nfl_network_channel_number_on_dish.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/dozore/49494257745.pdfIn PDF document text
    • https://s3.amazonaws.com/povelenavuviw/new_ethio_film_free.pdfIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/docker-machine_bash_ip_command_not_found.pdfIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/fazeg.pdfIn PDF document text
    • https://s3.amazonaws.com/jeponowon/xegiwigajiwenifugib.pdfIn PDF document text
    • https://s3.amazonaws.com/zonivezada/24546606639.pdfIn PDF document text
    • https://s3.amazonaws.com/babuxufarizuxur/beautiful_natural_flowers_video.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_off0000e4a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A4 5376 bytes
SHA-256: e852176a41cef35e5b83f8dad6a234fb4b859a88bd993693fcd978055f3b5b65
font_01_sfnt_off0000f6eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EB 10420 bytes
SHA-256: 0804791350ceba6f7eaf358e98143313c64f167f58c23474f20615cc76df137e

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