Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cb8219e8f45241c…

MALICIOUS

PDF

81.4 KB Created: 2021-03-29 01:25:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a14d23998a649d54c6e783e5a528e7f SHA-1: 53e21b40fb19ecc6b0b8d05e5477f7e463328c82 SHA-256: 2cb8219e8f45241c3386c48b2500b7fffcb336ebb72cabbb4a2a7c0dfc2a147b
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. One prominent URL, 'https://midufefew.ru/wix?keyword=insured+non-residential+grant+deed+florida', is directly associated with the malicious verdict. The presence of embedded PDF link farms and the ML classifier's high confidence score indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/wix?keyword=insured+non-residential+grant+deed+florida
    • https://static.s123-cdn-static.com/uploads/4490724/normal_5fec27151d11e.pdf
    • https://static.s123-cdn-static.com/uploads/4379856/normal_60084966cb2fa.pdf
    • https://cdn-cms.f-static.net/uploads/4373520/normal_6026f3578eb99.pdf
    • https://cdn-cms.f-static.net/uploads/4449009/normal_605c2f13e77c4.pdf
    • http://nutosuvitiraj.scienceontheweb.net/pukow.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/62abd497-925d-4451-bebf-c05e02c380c3/kapupavo.pdf
    • https://uploads.strikinglycdn.com/files/3ca34f64-3883-47a1-be94-425411bca77a/sunbeam_sgb8901_manual.pdf
    • https://90e68d66-75cd-4f9f-aa76-03b1e6b67b4d.filesusr.com/ugd/324cd8_64b9bd6fa2a547a6b38079ca7376986d.pdf?index=true
    • https://24218389-b518-4ca3-8548-65eaf758daa4.filesusr.com/ugd/c836c3_2c9a5c779a0f4a41a96f0f10febb19f1.pdf?index=true
    • https://uploads.strikinglycdn.com/files/1e90524b-2d9d-4699-ab18-58f57342dd84/how_to_in_text_cite_a_quote_from_a_person_apa.pdf
    • https://uploads.strikinglycdn.com/files/fef3ef8c-1de2-4b09-bb0e-c2165e353eec/roland_fantom_x6_user_manual.pdf
    • http://kurerori.myartsonline.com/nodegavigitajaribaxunu.pdf
    • https://s3.amazonaws.com/bibejovixapis/94576426929.pdf
    • https://uploads.strikinglycdn.com/files/af120ec6-8097-43ad-9fa2-4df3543c016f/bosch_silence_plus_50_dba_will_not_drain.pdf
    • https://uploads.strikinglycdn.com/files/ee94985b-918e-487e-8dd0-9f3a6b35d9d0/24833693708.pdf
    • https://s3.amazonaws.com/jagux/23145856442.pdf
    • https://s3.amazonaws.com/lewuli/cheap_flannelette_sheets_uk.pdf
    • https://uploads.strikinglycdn.com/files/36de23be-1b33-414b-923b-afa98b8626f9/jaluxunepupulimal.pdf
    • https://s3.amazonaws.com/sobaketemu/android_jetpack_navigation_example_java.pdf
    • https://s3.amazonaws.com/fovezewi/chefman_xl_3._5_air_fryer_manual.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001011d.bin
e07e2a6f363dfe53c9ae87bf40481dcbea0a684c4ae99225930e8550cf4ae31a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1011D 5044 bytes
font_01_sfnt_off0001125b.bin
20b3757fb700cbb0755438d185ee4cccc7ca760b058726a931c362ea30e6a42e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1125B 11176 bytes

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