Malicious PDF — malware analysis report

Static analysis result for SHA-256 84b21873048f6127…

MALICIOUS

PDF

154.6 KB Created: 2021-03-24 22:28:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ba862739201d4fca1f65b47e9cb175c0 SHA-1: ca04a26735898e35a278f37b7c7214691416e8a4 SHA-256: 84b21873048f612759c0369266b271bc427fbae840f96b8a451bf1c892f18fa2
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 0.9956

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://resalured.ru/award?keyword=absorption+costing+formula+pdf PDF link annotation
    • https://cdn.sqhk.co/zuxifobiro/fhihd7w/morpeth_chantry_middle_school_uniform.pdfIn PDF document text
    • https://cdn.sqhk.co/tisojubew/ichf6gh/candy_fever_game.pdfIn PDF document text
    • http://yogait.space/67696443327oy3go.pdfIn PDF document text
    • http://japamawosoj.mygamesonline.org/rurixowewisuzapejarozaror.pdfIn PDF document text
    • http://artdebug.site/the_heroines_journey_workbookhvzl0.pdfIn PDF document text
    • https://cdn.sqhk.co/rijakobebux/CQifhcR/85559987831.pdfIn PDF document text
    • https://cdn.sqhk.co/norumuwapa/NhbGVG1/94868232097.pdfIn PDF document text
    • https://cdn.sqhk.co/xedomobedusi/eUIjiHP/36431500763.pdfIn PDF document text
    • http://netewe8.xyz/mixorunidexuvusutawum3lu4d.pdfIn PDF document text
    • http://wumiwuzigimo.mywebcommunity.org/plantronics_cs510_wireless_headset_reviews.pdfIn PDF document text
    • http://pajuwepubawip.sportsontheweb.net/microsoft_access_365_tutorial.pdfIn PDF document text
    • http://jabudapitu.scienceontheweb.net/castrol_lmx_grease.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/419ed03e-504f-42ef-a4b9-2d11aac430d4/88935107364.pdfIn PDF document text
    • http://revodez.myartsonline.com/descriptive_analysis_of_quantitative_data.pdfIn PDF document text
    • https://b20aee1f-b1b7-4e4e-be5e-d884e4ece670.filesusr.com/ugd/10e3af_ff122914e3334c29981aac70386d9dae.pdf?index=trueIn PDF document text
    • http://gegilifopom.myartsonline.com/74143627149.pdfIn PDF document text
    • https://d8acad56-eb9a-42d1-a06c-a695c5b02328.filesusr.com/ugd/0ad6c7_73bf268283fc4d0c8ea63d5ca802c655.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9175eb6d-8126-42b2-80e7-de2fefc25f61/wixujekiriram.pdfIn PDF document text
    • https://20996a60-9695-4f45-8fdb-44bdc783da55.filesusr.com/ugd/c57cae_5325092ec6034a19b36b052b44efd066.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd203145-e92f-4b0e-b536-3ab488524fa5/schwinn_240_recumbent_exercise_bike_replacement_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b1d74c9-ae5c-4e5f-bbb3-e1d7b4a4e2b4/puxakoju.pdfIn PDF document text
    • https://cad90261-f038-4e8a-b384-2e0e37e6cb8c.filesusr.com/ugd/4c4e45_aecce4aa9db84dd1bd9ec09f4a476154.pdf?index=trueIn PDF document text
    • https://237a2310-9536-43ad-add1-fe73b840a51a.filesusr.com/ugd/8b319d_58cca344ffa94198bd0e3aab83a5cce5.pdf?index=trueIn 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001ffbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FFBB 3372 bytes
SHA-256: ed8f4b56adb22cd4e5535f0e2963dbc20bca36cf173cef4ca29adc41ca8e000e
font_01_sfnt_off00020bcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20BCC 5368 bytes
SHA-256: cfc470dca918579a03ccdcb75a87af8e060361a8413c8c7b093da8a3bc3139bb
font_02_sfnt_off00021ddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21DDD 16168 bytes
SHA-256: 6f8b35f7bc3f9ad45d7aa2b0ecbaa0c33763141784cdab74e6ecffe7dfc8ce6c
font_03_sfnt_off00024df1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24DF1 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71