Malicious PDF — malware analysis report

Static analysis result for SHA-256 b51133c6c1ca7afe…

MALICIOUS

PDF

73.9 KB Created: 2021-03-23 11:34:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0dff7bfb5e577fb9d74486585f8fdb61 SHA-1: 22a8565d4cab6fae683971b45ff295d1205b34e8 SHA-256: b51133c6c1ca7afe3c248f955f9d27409de7465e264207d825b92202c25d8c6e
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to potentially malicious domains, suggesting a link farm or redirection mechanism. The embedded content, though heavily obfuscated, appears to be a lure related to 'Mapa cantabria carreteras pdf', aiming to direct users to the primary malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://mezovuduw.ru/award?keyword=mapa+cantabria+carreteras+pdf
    • http://rejawulomov.mywebcommunity.org/vanoxotonizun.pdf
    • https://static.s123-cdn-static.com/uploads/4452862/normal_5ff09af5c715c.pdf
    • https://cdn-cms.f-static.net/uploads/4425921/normal_603e18f28ce3c.pdf
    • http://fakexexu.sportsontheweb.net/download_lagu_eclipse_ncs_mp3.pdf
    • http://zoguponuwuxoli.medianewsonline.com/mesufapasatak.pdf
    • https://static.s123-cdn-static.com/uploads/4486221/normal_5febdef7afc4f.pdf
    • https://static.s123-cdn-static.com/uploads/4385636/normal_5ffeb2de81bb5.pdf
    • http://befotuke.mywebcommunity.org/how_to_replace_amazon_fire_7_battery.pdf
    • https://cdn-cms.f-static.net/uploads/4410731/normal_6035cdec833a2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/27e3b9e2-ff41-4a63-bf1b-547809a4b3a3/guxagukili.pdf
    • https://uploads.strikinglycdn.com/files/5642652d-8d20-40df-8b6b-80e8d0ae2d56/jaxedotidapixisegu.pdf
    • https://f733e552-90a1-4d1f-83ca-a6b36afcf31c.filesusr.com/ugd/38bf1f_6f1f87fe68fb46af9ab1e85c350797e8.pdf?index=true
    • https://c941d99d-b58b-4215-81ce-525e38db2b81.filesusr.com/ugd/2dc4cf_9bac16f366e745c0aed0acb519041a37.pdf?index=true
    • https://d3df31c7-72fe-42b1-a92e-0723e8ed7a16.filesusr.com/ugd/5bf82b_8c9d854f4b1a481f8fe5651757f443fb.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d6cde9b2-6a2a-4885-b206-c4fb2c934b4e/platicas_pre_bautismales_en_cd_juarez_chihuahua.pdf
    • https://434dcbc4-7bd9-40fe-99bf-e102daebf961.filesusr.com/ugd/07ef24_19421f8fdbd94f4b94b5afc782c6765c.pdf?index=true
    • https://ebc1add8-0b9d-418e-9e4a-1e287827e933.filesusr.com/ugd/ab63e3_29253577be4b4b71b4943f0ad0ea32dd.pdf?index=true
    • https://a2c67b61-a01d-4053-b7ad-f1487bca8054.filesusr.com/ugd/24853a_5dfbf3ba4dd34f1a8c79de04863a897d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2033abca-1347-4517-8310-27f099ff3773/mewivukewoparazoxuw.pdf
    • https://f43304fd-85e4-489a-8612-81977e01be4a.filesusr.com/ugd/b6f504_5baa2f24b3e047468f32003e934142b6.pdf?index=true
    • https://uploads.strikinglycdn.com/files/dfe1d594-b3b3-4488-9189-f85603651e7c/zukolivugakej.pdf
    • http://wenares.myartsonline.com/marketing_management_salary_in_south_africa.pdf
    • https://uploads.strikinglycdn.com/files/9fe2cb40-155b-4952-af1d-1d021f681c64/python_beginners_book_download.pdf
    • https://uploads.strikinglycdn.com/files/9d28d9fd-bd1c-49bf-9d8b-dd896e1122a0/fojezenumojesaza.pdf
    • https://uploads.strikinglycdn.com/files/1f4bc462-c6a1-4916-a32a-6221cea89302/killing_floor_2_prestige_5_rewards.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_off0000e10d.bin
91121c56afdb301e35994ef75f58bcf8e2e6757f1db9c5094294ba36da1b3e49		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE10D 5264 bytes
font_01_sfnt_off0000f303.bin
c96e69f33bc239b7a2b06345171eee19a6a0b5361788ee2e8326601ad60ce6b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF303 11976 bytes

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