Malicious PDF — malware analysis report

Static analysis result for SHA-256 11de405f49db1d27…

MALICIOUS

PDF

71.0 KB Created: 2021-04-03 22:27:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 79fcbca0f511d7c88ec21f83073c1d8b SHA-1: d6dcc3aa235685a1067e67084fdeb49018723b6e SHA-256: 11de405f49db1d272b62b48caa45735b00f111c524697c016099581c5981b9c3
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, flagged as a link farm. One of these links, 'https://pelibifir.ru/123?utm_term=macassar+ebony+veneer+sheets', is identified as a potential malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO abuse.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/123?utm_term=macassar+ebony+veneer+sheets
    • https://cdn.sqhk.co/dedomafub/cciaCLC/growtopia_download_mac.pdf
    • https://cdn.sqhk.co/dovoxukeni/ehie2al/bryant_s_neighborhood_marketplace.pdf
    • https://senolotazafam.weebly.com/uploads/1/3/4/5/134597296/7915602.pdf
    • http://kevirikadu.iblogger.org/yii2_tutorial_download.pdf
    • http://lowafax.22web.org/romamaga.pdf
    • https://kanunobak.weebly.com/uploads/1/3/1/0/131070574/busozoze.pdf
    • https://cdn.sqhk.co/kasuwajavi/jieSHLW/steven_universe_quotes_love.pdf
    • https://cdn.sqhk.co/fofodafexadu/OiaLgjn/funny_talking_parrot_videos_2018.pdf
    • https://cdn.sqhk.co/nupopobax/jd27gjh/best_car_speedometer_app_for_iphone.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/dd431fbd-3e68-4802-a687-1b925baef17b/identificacin_de_razones_trigonomtricas_seno_coseno_tangente_en_tringulos_rectngulos.pdf
    • https://uploads.strikinglycdn.com/files/0e14f027-22ec-4714-b508-4a9fc19583b8/dream_interpretation_islam.pdf
    • https://uploads.strikinglycdn.com/files/95c9fde9-61af-4451-86f1-ce2dcd29af76/baby_girl_names_and_meanings.pdf
    • https://02408c19-b9f6-4996-a596-1d5b7e46c8d3.filesusr.com/ugd/c83fdb_d771112022204241824415677ef395ce.pdf?index=true
    • https://156bb51f-0b62-477f-88ca-8620af00812b.filesusr.com/ugd/e3ff21_186b06d21e554d1d8a894e0fe256178a.pdf?index=true
    • https://f98f40d2-b649-4e6b-99af-b89bbf2331ff.filesusr.com/ugd/724bd4_5ec0fb5a77d84960ada365bf8ead0aec.pdf?index=true
    • https://uploads.strikinglycdn.com/files/99f482a3-69de-40a8-93da-c0d1cb29c409/49508237796.pdf
    • https://uploads.strikinglycdn.com/files/ca9c4e84-8c4c-46e3-ad22-bde25dbf32f3/foscam_fi9900p_microphone.pdf
    • https://uploads.strikinglycdn.com/files/7da0a398-df0c-4425-afe1-2199673cd5f5/birujudebebevizo.pdf
    • https://uploads.strikinglycdn.com/files/5a2d0dbd-9f69-4528-89bc-a6d1a91665f3/weleluvenuxet.pdf
    • https://5e54d98c-4257-4cc7-9010-48f3df296eb2.filesusr.com/ugd/05240c_2e198215d7e641b09a307dd3a1c9d08c.pdf?index=true
    • https://0dc5016f-38c0-4e11-84f4-4717e3ef4ec7.filesusr.com/ugd/4fd84c_8b253122db6c4d91bef882f39637a41e.pdf?index=true
    • 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_off0000d89c.bin
1d039d5d683da8545f1ca6a868990987e68805a7f042804c70a50a739e244835		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD89C 5164 bytes
font_01_sfnt_off0000ea3e.bin
65b96f6acb2733a533cbacc9a5a6f643c83766f71f6f9c3dcd7f162839339b89		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3E 11096 bytes

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