Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba0041dab40319db…

MALICIOUS

PDF

77.3 KB Created: 2021-03-23 20:17:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b592b67e6717c0632aa38ed9821646ec SHA-1: e9b0feae82fae75acb123e131cbd75e8efa2a9bd SHA-256: ba0041dab40319db6232add71f05b91e9a96fbe2a45ddf4bba68c65e717de671
156 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 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://lozipotod.ru/aws?utm_term=overthrow+stephen+kinzer+book+review PDF link annotation
    • http://tuworiki.22web.org/fariduluwapibekanifebu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454971/normal_5feafb543b936.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471249/normal_60191effb076b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404313/normal_603aa30552e3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418777/normal_60375b0465393.pdfIn PDF document text
    • http://gexafudotifunud.66ghz.com/tadaxosevenezi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502178/normal_6022d645cbe5f.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/palikuvexake/30470208966.pdfIn PDF document text
    • https://2a50e20e-73b4-464c-af53-7ac4f68fee21.filesusr.com/ugd/7dd30d_be9ba159568646168b1f9967d5202dca.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/who_report_on_food_fortification_with_micronutrients.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bed59a59-2ddd-423c-9713-7321054100dd/car_form_lra_revised_6_18.pdfIn PDF document text
    • https://s3.amazonaws.com/fevobelijogal/leukemia_journal_guidelines.pdfIn PDF document text
    • https://fe426b01-1dd0-498a-b08e-7ec37e320b94.filesusr.com/ugd/6b45f0_36ec6a55b459460781c7de6dcfb21aad.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vovuzize/47163653832.pdfIn PDF document text
    • https://s3.amazonaws.com/davubewu/metformin_side_effects_kidney.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fb6beda-c6c5-4187-8bd8-0e839ca2df5e/kenmore_gas_range.pdfIn PDF document text
    • https://7a3463bf-3117-47cc-940f-ad9d50d05675.filesusr.com/ugd/9f2514_ab0707a0aa3941469b3141bdad9b3d03.pdf?index=trueIn PDF document text
    • https://2c549fd3-bbcc-4e43-aea5-84609313cfd4.filesusr.com/ugd/c162b3_1168c881b8a747368eece62860731fa4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nosepevozux/java_check_if_string_contains_date_format.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d21b09b-54c1-48ae-85ae-48eeb5ca8723/98022610667.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_off0000f135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF135 5096 bytes
SHA-256: 203ef514369899300eff7bad94c12d6fcd576aeb9ee8ff4d025a75d9a94f05a9
font_01_sfnt_off000102a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A3 10920 bytes
SHA-256: c402602531af170266806afdd5073a02f0924b44a22bd04066f16f127911e5ff

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