Malicious PDF — malware analysis report

Static analysis result for SHA-256 533b78f5f8ef25e5…

MALICIOUS

PDF

83.8 KB Created: 2021-03-24 16:03:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 77dd25db5ce06344eba746195a36f545 SHA-1: 11d222859e8784cd025038a496338f34cc0914ce SHA-256: 533b78f5f8ef25e54f4e79b5d6b3d75a3fb92d07990b3e99a16ecf3867a3e527
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 0.9983

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://dafemum.ru/strik?utm_term=melissa+the+apology+seinfeld PDF link annotation
    • http://gouliwer.online/ryobi_table_saw_extension_kit9uyft.pdfIn PDF document text
    • http://natnat.fun/sunoten8r2f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473403/normal_6007e4d714d43.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494866/normal_6039369cee051.pdfIn PDF document text
    • http://saudiautoinsurance.com/drag_sports_bike_wallpapers_for_desktop5qulz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389090/normal_600d796690a3f.pdfIn PDF document text
    • https://cdn.sqhk.co/rawerusiwala/Figxtib/jedopevut.pdfIn PDF document text
    • https://cdn.sqhk.co/liminekaj/qa1haIG/99187505694.pdfIn PDF document text
    • http://fesurowejo.mywebcommunity.org/fejirisadiweje.pdfIn PDF document text
    • http://whysmall.space/harris_matchless_g80_performance6arou.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499329/normal_600cc533bb242.pdfIn PDF document text
    • https://cdn.sqhk.co/danopefasuf/lsjjQzT/xusubexame.pdfIn PDF document text
    • http://hookup157.fun/how_to_write_a_process_speechog6mw.pdfIn PDF document text
    • http://zodatowafe.getenjoyment.net/jpg_to_online_sejda.pdfIn PDF document text
    • http://vugekowuzujed.scienceontheweb.net/how_to_obtain_a_drivers_license_in_arkansas.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/fujadabez/middle_school_grammar_textbook.pdfIn PDF document text
    • https://0e9c393c-9feb-4465-ae9d-4486bea7a644.filesusr.com/ugd/4b68be_dd8adb4670ca4ca6ae29e3fe6b01f6b1.pdf?index=trueIn PDF document text
    • https://711a90e7-97f2-4eab-8690-3003ec1e9b64.filesusr.com/ugd/a0905b_f5167ca76d554e38863380fdaf9af0c4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bidurudilidujug/81027238261.pdfIn PDF document text
    • https://s3.amazonaws.com/zakunafu/bidadari_surga_video.pdfIn PDF document text
    • https://6ba8113a-99dc-4618-97bf-d7180f10ff72.filesusr.com/ugd/b6edda_e9077176575d4439bfabe5ee655c7cca.pdf?index=trueIn PDF document text
    • https://cf587a47-7c2f-4f55-8bbb-21a4c73503f7.filesusr.com/ugd/8ea597_782e898598ff4a7ca85e90c92034c208.pdf?index=trueIn PDF document text
    • https://b913155d-2712-4fd4-bcc6-651970a8c456.filesusr.com/ugd/e39924_277f99cfaaa44eaeae0c2ef629a16e31.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/midipes/baguruvazegefibisatatajub.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://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8E 5100 bytes
SHA-256: 137e9facec432cc07a6351e0177a5496d410e4c0a9cf7219963878258eff161e
font_01_sfnt_off0000fce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE9 6148 bytes
SHA-256: 0b38f6fd5e0b54bfa22d5adee1cfe00629fe134100fc7cfc1ad14a2ab7974207
font_02_sfnt_off00010cc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC9 10792 bytes
SHA-256: 7fe849035010ce850e4486c6972bb78f6badff5aac10a863f17903ddf4528e9e
font_03_sfnt_off000131a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131A6 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176