Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2b810cff1077b09…

MALICIOUS

PDF

75.0 KB Created: 2021-05-04 21:29:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 196e3e3ca09116733037868ce2cfe0d1 SHA-1: 9da32f163d7e586446e57a1a3b4b39093bc6f7aa SHA-256: e2b810cff1077b09f385e0d0ebc339c8f6b48c18bbcad48fa3f7caa2c2d8fb75
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/strik?utm_term=the+twilight+saga+breaking+dawn+part+2+album+songs PDF link annotation
    • https://cdn.sqhk.co/bularalunop/3jcnjgw/83064284470.pdfIn PDF document text
    • https://gozezitigaja.weebly.com/uploads/1/3/4/3/134340412/3948340.pdfIn PDF document text
    • https://nudetotiba.weebly.com/uploads/1/3/4/8/134872476/babeg_fakibiruso_xonoli.pdfIn PDF document text
    • https://cdn.sqhk.co/furugilenu/ep7iaMq/baidu_root_latest_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/nikazurokuv/gjMifTt/introduction_to_business_law_5th_edition_ebook.pdfIn PDF document text
    • https://vegekonewipure.weebly.com/uploads/1/3/5/9/135964828/nodasiwi-tejusu-josijizikaw.pdfIn PDF document text
    • https://cdn.sqhk.co/musezikuzapi/ij2dMeA/time_table_generation_flow_diagram.pdfIn PDF document text
    • https://babixedijifaz.weebly.com/uploads/1/3/5/3/135385025/1186768.pdfIn PDF document text
    • https://fulipevaxavu.weebly.com/uploads/1/3/2/6/132695351/9833769.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/kexamoxusinixu/zarinuwamagumotedejixo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d911726c-a392-475f-95f1-18b957b06210/phrasal_verbs_esl_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de030da9-1d23-4bc7-a419-6fda7064a553/how_to_bypass_parking_brake_wire_on_jensen.pdfIn PDF document text
    • https://065b66ee-25d8-4381-b309-094abc4d823c.filesusr.com/ugd/2703e6_e447b9070f3f495593c8396521989645.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jevopemosod/reconciliation_report_in_data_migration.pdfIn PDF document text
    • https://13adc596-845f-4f4a-b539-e2c04a0a4b5a.filesusr.com/ugd/6e2da7_ce8a9219c67245a6ac1966680b449470.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee2cd3ba-1f9f-4b6e-97f7-20fbdc776a9e/vepibiwugiwesov.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_off0000e312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE312 5748 bytes
SHA-256: 92fcf8e357e64c9d482518ea615225273c9d2ec51d8c8606faee223e14bcea6a
font_01_sfnt_off0000f685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF685 11396 bytes
SHA-256: 8e54d71d81041f72031a5441e29f19354aad9c5fe3e719c5af721cb808a14950

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