Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b0ba1c33cef04f3…

MALICIOUS

PDF

78.0 KB Created: 2021-03-29 19:37:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d6071736cf6029be34282cc4b716ab3b SHA-1: 9ec94641330a22d45a2a76c81f505560c7c09b56 SHA-256: 8b0ba1c33cef04f35c7a8986dfc625cdc98aa323c7b01f498e530e52fc3c80b4
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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-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://jacksth.ru/wix?keyword=projectile+motion+worksheet+answers+algebra+2 PDF link annotation
    • http://vivekawiga.sportsontheweb.net/zumefum.pdfIn PDF document text
    • https://cdn.sqhk.co/dawiredi/iiWjhhd/enterprise_cobol_programming_guide.pdfIn PDF document text
    • http://tuzevijubozor.mywebcommunity.org/international_atlas_of_casting_defects.pdfIn PDF document text
    • https://fobaripiso.weebly.com/uploads/1/3/4/4/134443650/nubuzaxi.pdfIn PDF document text
    • http://gemubanabugawa.mypressonline.com/dutilawutuvevavula.pdfIn PDF document text
    • http://tujidal.mypressonline.com/dovimetiwokilugog.pdfIn PDF document text
    • https://duzareledibasa.weebly.com/uploads/1/3/4/8/134890493/4055882.pdfIn PDF document text
    • https://cdn.sqhk.co/xonafelog/nieojiG/hacer_multi_stream_con_obs.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/fekife/rufasujafomefurugije.pdfIn PDF document text
    • http://ditanumugagoma.myartsonline.com/neumonia_nosocomial_pediatria.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca0cbfad-9086-42ff-8f33-f9cdc31b3875/kuralivasepifowed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/618efc4b-3f18-409e-99ee-7b0f56685d1f/motabukejugutaxaxedesajib.pdfIn PDF document text
    • https://679cd94f-bb1f-411a-9684-d99498fe93d6.filesusr.com/ugd/ce16d4_65815805deef4353ba0e5de9cadcd867.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e979d84d-52b7-4bb2-8ef9-58cfb7e873c1/warcraft_3_reign_of_chaos_patch_download.pdfIn PDF document text
    • https://s3.amazonaws.com/fumiposamisur/malaguena_piano_sheet_music_free.pdfIn PDF document text
    • https://s3.amazonaws.com/nefunupu/bellewaters_floor_plan.pdfIn PDF document text
    • https://3568c1c9-c281-4b9a-9ea9-d5d291e0176b.filesusr.com/ugd/e5d8db_341e607721af4570a8c8a38f74976dfc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zukogi/dc_library_card_form.pdfIn PDF document text
    • https://f7cac2f2-528f-490f-9bef-cb2448a877de.filesusr.com/ugd/529ba0_5583ceff2e5a45a2948ddc6c5b0a2fe3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/abb46064-b370-42c8-893b-102bd721494f/9614118178.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_off0000f150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF150 5716 bytes
SHA-256: 10548e3090c975f6d49d6ed6922a410fb05356e5f70c5b74ac3f1f837f20894e
font_01_sfnt_off000104b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B8 11084 bytes
SHA-256: d0f7b425302e48ff9c90e62a51f24229d536e6846d9614ed1261ea3128ebdfd6

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