Malicious PDF — malware analysis report

Static analysis result for SHA-256 b47f943eff71960b…

MALICIOUS

PDF

99.2 KB Created: 2021-03-12 14:56:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 5d68d2008dc78b01e76753499689b45e SHA-1: 26a888a48f0aff672f8755e661abf07129c4d404 SHA-256: b47f943eff71960bbd504637211e7422d372fa907f31da86c035b974aeed23b2
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://gimoguvi.ru/123?utm_term=nice+guidelines+antenatal+fetal+monitoring PDF link annotation
    • https://cdn.sqhk.co/videgogaf/jahhhc3/fugovikiwuzupepaxusuzixas.pdfIn PDF document text
    • https://cdn.sqhk.co/tirewaku/Yhgjjii/pinata_hunter_3_unblocked_games_77.pdfIn PDF document text
    • https://cdn.sqhk.co/rovifatira/uVjgJbB/lethargy_in_cats_after_vaccination.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450044/normal_602d395b4c11b.pdfIn PDF document text
    • https://cdn.sqhk.co/jonilinenuvo/fqNgchf/fuluwotes.pdfIn PDF document text
    • http://stylecurtains.com/2229884541wboxx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387817/normal_5fe2847a3d394.pdfIn PDF document text
    • https://cdn.sqhk.co/sadirorig/Gkhixsa/granny_mod_menu_apk_2020.pdfIn PDF document text
    • http://zerkalo-fugicar.website/how_to_write_panel_discussion_questionszrkgt.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://59e5a08b-0d8d-455f-a3a7-35a3b781ab3e.filesusr.com/ugd/784815_18d0e2a8c99f4f2582164418b308c650.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/321e2e98-c4e9-4263-bd1a-ff443c14814c/how_did_human_races_begin.pdfIn PDF document text
    • https://ba10d46a-d7c1-43af-8542-f1a50f31aa8a.filesusr.com/ugd/4dded2_a9808748a5654e4293032af290569721.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/ziwatakadimumagitut.pdfIn PDF document text
    • https://s3.amazonaws.com/gekojulog/lagu_panganten_anyar_bungsu_bandung.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/911c9a16-44c8-486a-954a-f9168804ac50/rirebezajoliralarezutix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/651bac88-b51a-4e99-8181-94a98d0c1fe5/ampli_fishman_loudbox_mini_charge_used.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7acbd35-2306-4fda-9918-5229dc22cec2/sunbeam_bread_maker_recipes_book.pdfIn PDF document text
    • https://6196a4e6-b3b5-4a85-a139-4ec84e0a53d9.filesusr.com/ugd/d01287_9128c8b48a0245a6ae1208ba72ce96fc.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000149d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149D7 5308 bytes
SHA-256: c5e43cee35f09a350e7b47ec6a67f2f6a527114922f8ae6a6a76ffbfaa74acc6
font_01_sfnt_off00015bd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BD6 10504 bytes
SHA-256: 98edc707da28fa61fa418ff07023d8479f1f98866a832191b2b280bdde867de7

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