Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcae2a4d07834697…

MALICIOUS

PDF

95.4 KB Created: 2021-03-04 15:35:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 58229e7586b3eb13ab544246a0d2c2af SHA-1: 85769c225db89fef920b79ef2d0bd83957c712b3 SHA-256: dcae2a4d07834697583eab3aa6c62aae2541c0a032f52ff277b4edfc6a1f7b21
156 Risk Score

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 0.9996

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 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.
  • 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://kuzutuzo.ru/strik?utm_term=hopper+with+sling+reset+button PDF link annotation
    • http://ayazshabutdinov.club/how_many_calories_in_a_subway_cookiezitln.pdfIn PDF document text
    • http://gramnews.xyz/terapi_cacar_airl56t9.pdfIn PDF document text
    • http://drilltech.info/what_size_pool_heat_exchangervmj7o.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/perurulexi/android_auto_xda_dev.pdfIn PDF document text
    • https://s3.amazonaws.com/geraromu/does_xbox_360_live_cost_money.pdfIn PDF document text
    • https://s3.amazonaws.com/tesasubawalozan/zosunoxefizorurudujivi.pdfIn PDF document text
    • https://dec4a425-646e-450a-80ca-a73a75d058ad.filesusr.com/ugd/ba3095_87722330c58b427b906ba83dc7f35b86.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rudelazifizuvo/61488699085.pdfIn PDF document text
    • https://ef4b221f-cfb4-47e8-bf1d-3b5092770df7.filesusr.com/ugd/4948da_370d7d385b5a4f7eb618c792ac81bcde.pdf?index=trueIn PDF document text
    • https://17673d3b-e5d0-4e0e-8211-f079fadf35f5.filesusr.com/ugd/13ae68_ef22c3bf422745f2bf06ae2772dfa59a.pdf?index=trueIn PDF document text
    • https://88749095-6fd7-453f-8e8a-15b48fe47dd1.filesusr.com/ugd/e4d7df_3b96dd744a614824bc7a53b128c3f382.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mogipegi/87575395646.pdfIn PDF document text
    • https://s3.amazonaws.com/nezanurugega/razetemen.pdfIn PDF document text
    • https://2e4d99de-9d37-4ce2-abd5-0bbccafdbe51.filesusr.com/ugd/33a2e4_fcf99b93d5d64b4381765fc0394eeaeb.pdf?index=trueIn PDF document text
    • https://6762652a-e869-40f3-960d-1446d4066230.filesusr.com/ugd/55e6b1_66dd3188b52147dfbc4287bd1f5addfb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mokuwanibof/remonibapo.pdfIn PDF document text
    • https://s3.amazonaws.com/damerirazib/infusoria_adalah.pdfIn PDF document text
    • https://ce2645ba-e89a-43d5-afff-5c0150757291.filesusr.com/ugd/c63dba_b87c81e2e6044501ad24819ae3ee521e.pdf?index=trueIn PDF document text
    • https://3a00e800-a8eb-44ae-aafc-ae9aecab8e06.filesusr.com/ugd/1715bf_f10c2149d7614d048b1a74add29aa2ec.pdf?index=trueIn PDF document text
    • https://39c10a3a-92c6-412a-a1bb-b8a1fc48fbc4.filesusr.com/ugd/259099_72757929ad0840c9bad4bfda7c49c6e9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gofilafixu/attagasam_ringtone_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/vuraradaso/android_developer_classes_in_ahmedabad.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_off00013916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13916 5064 bytes
SHA-256: 08f168cef3703c1deb342e8647492014281a43e0ae5e5b1a855dec4aa37ba59c
font_01_sfnt_off00014a57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A57 11136 bytes
SHA-256: 0499b7b3c4c2e31366790147f9ef4b3365ad68c3c37760a9d35fad743a42e04d

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