Malicious PDF — malware analysis report

Static analysis result for SHA-256 d28d25a350d3a7c6…

MALICIOUS

PDF

88.8 KB Created: 2021-03-18 02:51:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: b65c8a52b4f5a62d7968350a64bb9e97 SHA-1: 2774217084ff1d6e50e1b1af87c2008284ad30cc SHA-256: d28d25a350d3a7c6969117a47bed0c84c37c17914fa645aa4ff8b8ee96214a14
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing trojan. It contains a large number of external links, many of which are likely part of a link farm designed to improve search engine rankings for malicious content. The primary external URL, https://kuzutuzo.ru/award?keyword=addison+wesley+math+makes+sense+7+pdf, suggests a lure related to educational materials to entice users to click through.

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
  • 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.
  • 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://kuzutuzo.ru/award?keyword=addison+wesley+math+makes+sense+7+pdf PDF link annotation
    • https://vafunaparixidi.weebly.com/uploads/1/3/4/6/134627598/7141a8f.pdfIn PDF document text
    • https://figagukedeliv.weebly.com/uploads/1/3/4/0/134040575/fe9eb67f73e37fb.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwunikuneg/0hbYGjc/green_papaya_restaurant_st_augustine.pdfIn PDF document text
    • https://bewokeramubi.weebly.com/uploads/1/3/1/6/131636949/segoxogadalodu-kobiridel-vegofonoxesarul-lotola.pdfIn PDF document text
    • https://cdn.sqhk.co/raxuzuvuluf/m74gdia/powudojozukoleg.pdfIn PDF document text
    • https://nusutaligufobam.weebly.com/uploads/1/3/5/3/135393176/pevizedibigujab_musabelila.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/pipaneku/92147208786.pdfIn PDF document text
    • https://s3.amazonaws.com/lekizopiloref/57795156687.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/762d3f05-d76d-49ce-be9e-7120479fce19/block_puzzle_high_score_screenshot.pdfIn PDF document text
    • https://s3.amazonaws.com/kulinisokakewi/astor_piazzolla_oblivion_sheet_music_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e944ce4a-7b6d-4560-85d1-04728e775ef8/download_driver_hp_scanjet_5590_for_windows_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e5500a9-e52a-43d3-a79d-bdb4dc65d0b7/tudifapigisivuxaxisexile.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c59a5f10-8a65-4015-af8a-46fa30bb408e/86982382711.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c94ccba-7a5c-462b-98ea-5b4c0374f311/what_is_the_newest_omega_juicer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9635c5f-2f2e-4918-b28d-6d53993a6222/vintage_tappan_stove_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/vizegemawokaxe/5838966236.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/625a5f4b-454d-4378-984d-05b9469c0a7b/93541986765.pdfIn PDF document text
    • https://s3.amazonaws.com/bakoloj/2461375894.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B7 5512 bytes
SHA-256: 061ed98c9bb957a92470c1863ff7ee3eff8a54d815284df74b5fcd7b95e6a80f
font_01_sfnt_off00011573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11573 13204 bytes
SHA-256: af0e129e4e6a23fd0e8d992dc0b08bcb63976899fe82adc91a050c110999743a
font_02_sfnt_off000140d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140D3 16132 bytes
SHA-256: 60f53b17f7925ac1818ac9336ea58fd206fea48872b5377b70e6fb8114080afd

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