Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e13bfae1ef29c0c…

MALICIOUS

PDF

71.0 KB Created: 2021-03-20 22:15:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 0b1fbf4277519a0e055748997d1eec38 SHA-1: b0f7f0efd73e1f97faa982013bf4174112149881 SHA-256: 1e13bfae1ef29c0c0f77d9495228e7617b0fd700aada6ede0f070b7878ca1d84
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://leonvi.ru/award?keyword=brain+gym+book+pdf+free+download PDF link annotation
    • http://geekcods.com/download_coreldraw_x6_full_crack1ni53.pdfIn PDF document text
    • http://tryporte.xyz/kotitosipod8usu9.pdfIn PDF document text
    • http://idealica-italiauficiale.website/the_pyramid_principle_mintor4g77.pdfIn PDF document text
    • https://cdn.sqhk.co/mozulunilex/jiHjeNU/badaga_dance_video_songs_free.pdfIn PDF document text
    • https://fomemavinujidi.weebly.com/uploads/1/3/1/4/131414297/1101129.pdfIn PDF document text
    • http://spainwow.pro/97608502288qjh35.pdfIn PDF document text
    • http://opros.xyz/abina_and_the_important_men_downloadikxpz.pdfIn PDF document text
    • https://cdn.sqhk.co/bewewojiwo/jJyOgfg/68078307119.pdfIn PDF document text
    • http://copyright-help-center.com/how_to_install_graco_travel_system_car_seat8s8gq.pdfIn PDF document text
    • https://cdn.sqhk.co/wujukipako/PgdAjaj/wiketababatiluvetag.pdfIn PDF document text
    • https://tatabakag.weebly.com/uploads/1/3/4/8/134885094/96227a03bd93881.pdfIn PDF document text
    • http://takipleskazan.org/706266055920p55y.pdfIn PDF document text
    • http://leadtop.co/39638449745l9zxx.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/jedadokuti/foluzejadupenizorisaru.pdfIn PDF document text
    • https://148d48ef-a78d-4e34-a4d2-755cfbac042a.filesusr.com/ugd/ccca9b_1b462fa144804485a46f89903fa61d24.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jokotaziweluge/43338019093.pdfIn PDF document text
    • https://00407fa8-a9ef-4b78-9bbe-46147fc8acf6.filesusr.com/ugd/5ecadc_952918a36b63458a98bbfeddff85e6b2.pdf?index=trueIn PDF document text
    • https://d920bd67-dfaf-4c99-85b0-fcb8118dfb91.filesusr.com/ugd/383849_83f4f7085e6843a9bb43e9ab7322936f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wajibile/pukuxilunibajawirelopuje.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d70b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD70B 5632 bytes
SHA-256: e38e24556920a8267821e7b0828dfc34102f569ade5ba109f9bd71ba7047e5e1
font_01_sfnt_off0000ea3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3A 10492 bytes
SHA-256: 13af056adb59dd4e803821b4523485a167555622eddf413fba6c2a3f76d12195

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