Malicious PDF — malware analysis report

Static analysis result for SHA-256 73b6f21512f5dd84…

MALICIOUS

PDF

77.6 KB Created: 2021-03-31 05:02:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 14489b2e1af96dc91853c0526180f644 SHA-1: 5922690898386427b42b461f67eab03311d592a9 SHA-256: 73b6f21512f5dd84132a1e94b3ee76582b1c0e1750becdc726af97fb6d92e337
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 0.9991

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://dafemum.ru/strik?utm_term=rain+bird+sst+600+reset PDF link annotation
    • http://sy0n.icu/sunuditorevesifikebesozattepal.pdfIn PDF document text
    • https://cdn.sqhk.co/fivufotimad/wigcl9O/real_chess_3d_free_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/subesanodag/cieEmjg/vaxiwesesaju.pdfIn PDF document text
    • https://cdn.sqhk.co/ganuniwiku/lPicGx3/boomerang_do_instagram_apkpure.pdfIn PDF document text
    • https://cdn.sqhk.co/bapuwanuvadi/PLoG0gi/riwelulinoxefirixof.pdfIn PDF document text
    • http://fisareboveda.getenjoyment.net/wings_of_fire_2.pdfIn PDF document text
    • https://cdn.sqhk.co/pukazibat/cFFgfhf/90098959406.pdfIn PDF document text
    • http://tesilav.sportsontheweb.net/mizex.pdfIn PDF document text
    • http://ninotekega.mygamesonline.org/makazizuma.pdfIn PDF document text
    • http://buyervannakupitvsem.xyz/lulekifiritoxubivi2vl9l.pdfIn PDF document text
    • http://milktree.store/make_red_heart_yarn_softjuryb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://45ae50e1-98a8-4501-9ad6-fc0df438eb43.filesusr.com/ugd/b16523_02ad85fed5f145969ad452d22299cbed.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc153cda-6b9b-448a-97b9-e9be924280f5/virujozozofulelibul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/368aa616-f18e-4bca-9166-ab7ca3b8d9a9/business_analyst_graduate_jobs_glasgow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/022adf87-d9e0-4a75-b96d-f4ac1026eccf/tupexotujezo.pdfIn PDF document text
    • http://zalatikewal.atwebpages.com/renaissance_period_art.pdfIn PDF document text
    • https://6363ce23-9394-4102-a476-7be320345719.filesusr.com/ugd/7c41c1_42a305e81328497bb3627e6a6755e8c6.pdf?index=trueIn PDF document text
    • http://lefegosab.epizy.com/bmw_high-_performance_ignition_coil_set.pdfIn PDF document text
    • https://9849c7ec-8b19-4b81-9a64-db2537ea7c40.filesusr.com/ugd/97b1c0_4294ae913c4f4ad2bf8d63a21c81fef1.pdf?index=trueIn PDF document text
    • http://metorudadoz.rf.gd/81635862160.pdfIn PDF document text
    • https://6196a4e6-b3b5-4a85-a139-4ec84e0a53d9.filesusr.com/ugd/d01287_50585116eebf422a84f865594d2563d2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/80fd59d9-36cc-4ce4-b471-bf05ff85bb1e/sanupemirek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7233eaa6-2aca-4324-b3da-f0409c086a0f/ruvatonisuredivimagoxeruk.pdfIn PDF document text
    • https://1580f21e-fc75-4350-9669-3be8b7525729.filesusr.com/ugd/eff6cf_3e24a41eb7ca4968a1e79012a32ee889.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_off0000f09b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09B 5228 bytes
SHA-256: 981b4bb0c1996873cc03057e358121869e3bff2aa5a5c7cab424e535cf39bd29
font_01_sfnt_off0001026a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026A 11648 bytes
SHA-256: 269037c1c098a739cbc20513dc953ca545946c18af943cc273c7b9ccd1e18b0c