Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1aee2873c66474c…

MALICIOUS

PDF

84.2 KB Created: 2021-09-24 07:22:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a8231b1672c7d1485313b4bad70d41b2 SHA-1: 2793a29d5fd6b96a9c5b7f21e8651ce0d46612bf SHA-256: a1aee2873c66474c6fd891f0a60df886309f9094062bc22acead25df0fb8c88e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external domains, suggesting it functions as a link farm or redirection mechanism to deliver malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating a tactic to obscure the true destination or host many potentially malicious links. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://aynadakikemalizm.com/resimler/files/2927263036.pdf In PDF document text
    • https://tskrea.com/userfiles/file/86058252109.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021092303322773499.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/zemitifesafi.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/nuvonifupevonut.pdfIn PDF document text
    • http://childprotectionindia.com/lexcyberia/userfiles/files/22823337269.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/22282064452.pdfIn PDF document text
    • https://kotypsy.pl/ckfinder/userfiles/files/64607629244.pdfIn PDF document text
    • http://burbank.kopanramen.com/uploads/files/loxupatuzijudawowep.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c65c98eb11---36403540522.pdfIn PDF document text
    • http://eventechsite.com/files/files/naguzogisaroxawawejivaz.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/sovijimerupu.pdfIn PDF document text
    • http://mindatpeace.us/uploads/files/70079134573.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16131390f6dbff---wopufoxomarugusa.pdfIn PDF document text
    • https://brod-plovdiv.com/images/21059691606.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/junok.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/60464689971.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/60243170222.pdfIn PDF document text
    • https://livewireeventz.com/userfiles/file/81668616318.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/50614136966.pdfIn PDF document text
    • http://rallyteamwalraven.nl/file/ziwigijojagutebogiboke.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/82831130323.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=super+simple+songs+bumble+beePDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE5 10648 bytes
SHA-256: 6f73bee0e06ca33cef139c6aefc712229da04ec0d445b182bf418de8753f1773
font_02_sfnt_off000114eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114EB 17768 bytes
SHA-256: ac7bb3dec73fb6120ee78a57bb99c5e47165c4bc2de89ba0f6628b5a3a599e54

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