Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f16fac2fa9295cd…

MALICIOUS

PDF

80.7 KB Created: 2021-03-15 20:54:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 091919d03665c85fcc5972fb9063366f SHA-1: 905cde7b01c4d0f8c6b9071745c5a969da4b313e SHA-256: 3f16fac2fa9295cd3f15044f97efa64b735550fd59d0904e370f669ebc2331da
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-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://druttle.ru/123?utm_term=invitation+letter+for+visa+to+usa+template PDF link annotation
    • http://wuvilorilete.22web.org/microsoft_sculpt_ergonomic_keyboard_driver.pdfIn PDF document text
    • https://cdn.sqhk.co/fosojatesog/eggopGB/53557395945.pdfIn PDF document text
    • https://cdn.sqhk.co/bexutavukaro/vGhggdG/mexutifitepup.pdfIn PDF document text
    • https://cdn.sqhk.co/tizesefetus/2hdggzt/wefegejovag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481520/normal_603ed3006c85e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483610/normal_5fd28b9ce4c7d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417834/normal_601b6a37ddcbc.pdfIn PDF document text
    • http://robakoziteba.iblogger.org/6657072402.pdfIn PDF document text
    • http://dazinifuxevoji.22web.org/501974063.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/548cf47f-d0be-4e72-be7f-3e8c4753a420/how_to_reset_my_kenmore_microwave.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6351eab8-09b5-457e-a39f-3337a078a08f/jump_force_ultimate_edition_ps4_characters.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6dc8627c-afeb-498a-9614-c5c564a4b3f6/50479626128.pdfIn PDF document text
    • http://diwuzenebixo.epizy.com/granny_hack_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/341f4873-5f81-4db3-8259-6a07fb8a36b1/programmable_logic_controller_training_classes.pdfIn PDF document text
    • https://s3.amazonaws.com/gonima/celine_belt_bag_size_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50152f71-5af3-4453-9f61-aad5df640630/synonyms_list_for_kids.pdfIn PDF document text
    • http://dadokupokumudav.rf.gd/xijikodifepekuxupobazeg.pdfIn PDF document text
    • https://s3.amazonaws.com/lolaritemukole/inverse_functions_worksheet_the_given_coordinates.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23ce80bf-fa95-4b1e-bde1-0da55571b055/jawbone_jambox_charging_port_replacement.pdfIn PDF document text
    • https://s3.amazonaws.com/tonemakopinibem/bootstrap_3_navbar_template_free.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_off0000fe0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0F 5044 bytes
SHA-256: 4fb6067f6481fc0549b421f3ffd6f2f9f24e3f89645feb6fb42a0c8802d5405a
font_01_sfnt_off00010f2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2A 11068 bytes
SHA-256: d707adf0df1b25ccc1c1e91776c4d7e0a352c4eb6dd90158c327fab33e153613

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