Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c16aeda41330d08…

MALICIOUS

PDF

97.9 KB Created: 2021-03-21 05:04:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: a52558a52279bb549eb13614eda3f058 SHA-1: 5397cea9ac723564869ecc9f42f4f34fe1f132d5 SHA-256: 7c16aeda41330d086a2db13b4c069af1ecec55964abdafc378ed41a6139413e9
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as Pdf.Phishing.Trojan. The document contains numerous external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The embedded text, while appearing as a question, serves as a lure to encourage interaction with these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • 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.
  • 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=select+the+true+statement+regarding+the+enthalpy+of+phase+changes PDF link annotation
    • https://cdn.sqhk.co/niripakexad/iUVvti5/6397032613.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408483/normal_5fe5369b3ca09.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/jjgcjiX/bluestacks_hd_app_player.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499021/normal_60519556ae6c7.pdfIn PDF document text
    • http://help-igcopyright.xyz/hydroranger_200_installation_manualzy3nz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480149/normal_6006f818e0cd8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412568/normal_5ff9bb094974b.pdfIn PDF document text
    • https://nasejanebuxilas.weebly.com/uploads/1/3/1/8/131856105/pafajoxusok.pdfIn PDF document text
    • http://krokoboko6.xyz/kinuzexebx1yuh.pdfIn PDF document text
    • https://dupizonax.weebly.com/uploads/1/3/1/3/131380343/zirurepuveneja.pdfIn PDF document text
    • http://strgb2.ru/21878512143ff8gc.pdfIn PDF document text
    • https://zabaparadasikid.weebly.com/uploads/1/3/4/3/134317604/1252457.pdfIn PDF document text
    • https://cdn.sqhk.co/wemitupu/fGdME0d/77434814621.pdfIn PDF document text
    • https://cdn.sqhk.co/xafukapewe/qifhiiS/bluetooth_music_player_app_for_pc.pdfIn PDF document text
    • https://misetibu.weebly.com/uploads/1/3/1/4/131438078/xunit-teduluxag.pdfIn PDF document text
    • https://ropexosuwewi.weebly.com/uploads/1/3/1/3/131380205/6775991.pdfIn PDF document text
    • https://cdn.sqhk.co/kolokejo/gjvdqae/world_cricket_championship_2_wcc2_similar_games.pdfIn PDF document text
    • https://cdn.sqhk.co/libuzewis/i8vidie/78695707367.pdfIn PDF document text
    • http://copyrighytsupport.com/15346651263thn4a.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/mivokozibu/xulerubis.pdfIn PDF document text
    • https://s3.amazonaws.com/gowupuzokowuxes/jolefubizikive.pdfIn PDF document text
    • https://s3.amazonaws.com/nopomewegobij/traffic_racer_hack_apk_ios.pdfIn PDF document text
    • https://s3.amazonaws.com/makumapikeze/80550419726.pdfIn PDF document text
    • https://s3.amazonaws.com/wamatasamegu/earth_charter_indiana_jim_poyser.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011cc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC4 2900 bytes
SHA-256: a28fcc4ba65d8171a55e8b87d646ac5d1dd213f66ab2b0026fd39e5ca5d32d1a
font_01_sfnt_off00012706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12706 5776 bytes
SHA-256: afe809a15952535337d7ccd547972e142a70778677729fb7952132a819c605bd
font_02_sfnt_off00013a8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A8F 11472 bytes
SHA-256: 2f118139d9018ea1c6bb8d1e2527c2673eb37d2a5d0c316e0ffc513a085263ac
font_03_sfnt_off000161d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161D0 16148 bytes
SHA-256: f2fe1b341ce625982f6229602509497cf1a9423964c663a7c58f6fce8010e377

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