Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab23657a779989dd…

MALICIOUS

PDF

72.0 KB Created: 2021-03-30 17:26:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 2d598da1fb9f06f4ccc699b025bd7b11 SHA-1: de4be9652a80be232f08f240b0af1877048103cd SHA-256: ab23657a779989dd1038c05a1aac362ca9b989382bbdf059f38f3650e79025c5
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one identified as a malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the ML classifier strongly indicate malicious intent. The document body, though heavily obfuscated, suggests a lure related to 'perimeter of a polygon pdf', likely a pretext to drive users to the malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://crophysi.ru/award?keyword=perimeter+of+a+polygon+pdf In PDF document text
    • http://kutegexuwudaro.getenjoyment.net/83534185642.pdfIn PDF document text
    • http://pogekoxuw.mygamesonline.org/amelia_bedelia_story.pdfIn PDF document text
    • http://natezaka.iblogger.org/american_made_film_parents_guide.pdfIn PDF document text
    • https://vopilejuwe.weebly.com/uploads/1/3/1/4/131407469/dapamiru.pdfIn PDF document text
    • https://lapokatodulobak.weebly.com/uploads/1/3/5/3/135347459/rirufejez-kafaxazemova-lifug-numagigukisin.pdfIn PDF document text
    • https://poxapoxidofex.weebly.com/uploads/1/3/4/0/134016688/ef942aa2deca1.pdfIn PDF document text
    • http://wafavipejolap.22web.org/thinkpad_t430s_ram_capacity.pdfIn PDF document text
    • http://rinujajija.getenjoyment.net/13768063334.pdfIn PDF document text
    • http://madusotiju.22web.org/one_sample_t_test_excel_template.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4052dc2-fbcd-4ffa-9f3b-4d9bb3fdb0a7/70313306795.pdfIn PDF document text
    • https://s3.amazonaws.com/batiku/archived_messages_on_facebook_messenger_app_android.pdfIn PDF document text
    • http://rorokepu.atwebpages.com/neumonia_tratamiento.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26639ff1-f812-4d69-9062-3f410a553544/why_structure_is_important_in_writing.pdfIn PDF document text
    • https://s3.amazonaws.com/desekusoxi/55286754037.pdfIn PDF document text
    • http://kamegowemegoguw.rf.gd/zutut.pdfIn PDF document text
    • http://lazakozezaxu.rf.gd/king_lear_act_1_scene_4_translation.pdfIn PDF document text
    • https://s3.amazonaws.com/fajixe/the_jacket_by_gary_soto_analysis.pdfIn PDF document text
    • https://s3.amazonaws.com/wukara/4370173280.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de3bb8a8-65a1-489c-858d-6271e00f4b6e/gns_430_simulator_ipad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f276624-6b96-4dea-a7ad-8728085be2e7/how_to_reset_samsung_dryer_he_code.pdfIn PDF document text
    • http://vasakuzepilaxi.onlinewebshop.net/wufezoginefefotenegizi.pdfIn PDF document text
    • http://nafaradevofipaf.myartsonline.com/81088849354.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_off0000dd58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD58 5284 bytes
SHA-256: 9fb633f0e36514e9c641ad4548f3464c07e22378bcb6d47e96c11313e6b75fe8
font_01_sfnt_off0000ef44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF44 10336 bytes
SHA-256: 9806d157f45dcde0451209c22f792f6de6812c88c4f8b20d3863be448b02a68e

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