Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6d052547ee73eb3…

MALICIOUS

PDF

75.4 KB Created: 2021-03-18 08:25:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 8d9a496121ae9ac0fbbb5d93279e2e0c SHA-1: ed01a0476ad789a43973168ec28b5526a55527c7 SHA-256: b6d052547ee73eb3504c95e5d0a8791491670f72e82404dbafbef3d7f6f791a2
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a technique often used in link farm attacks to manipulate search engine results or to host malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically related to phishing. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to redirect users to potentially harmful URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://xezojetit.ru/award?keyword=canula+de+guedel+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4373271/normal_5fffebdd62695.pdfIn PDF document text
    • http://espaceabone.com/36002186646acxns.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370078/normal_600210de65199.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422909/normal_60367154ab7c8.pdfIn PDF document text
    • http://s7hmus.org/world_history_patterns_of_interaction_chaptersaqjw7.pdfIn PDF document text
    • http://dombitarf.ru/apeman_a77_manuale_italianopgno3.pdfIn PDF document text
    • http://copyright-help-report.com/16077823958oqqk9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475379/normal_6031bec70098e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485015/normal_60162745a41fc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cef8af8d-7071-4339-ac50-fc417d371010.filesusr.com/ugd/a89196_537f90a7b0ac403988cb2124d9ff10bc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fokapikow/12460699292.pdfIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/weight_lifting_for_beginners_female_exercises.pdfIn PDF document text
    • https://s3.amazonaws.com/pubopelej/79369021761.pdfIn PDF document text
    • https://ca6b24e6-01cd-4368-a310-1df05077a315.filesusr.com/ugd/11b39a_e5607263f8d447d59519b34216505c8a.pdf?index=trueIn PDF document text
    • https://2e9d2e4a-15d5-4529-8b29-235aceea4e08.filesusr.com/ugd/cac96f_85760ce010ab4d398cc1eeee8c4ebd64.pdf?index=trueIn PDF document text
    • https://994180ce-385f-4272-9833-4a204a825e0f.filesusr.com/ugd/ec0c41_e123215d7a854affa6e456921ab48de3.pdf?index=trueIn PDF document text
    • https://d21da297-2d1c-4020-882f-059d99c29dc9.filesusr.com/ugd/3724a2_eb366362e8ca427b849feb5ede7910f8.pdf?index=trueIn PDF document text
    • https://a179b4bb-f9e1-4b0b-8685-f881d2afde68.filesusr.com/ugd/0fdb6d_763077876b134630bb2c1e7d1faff4de.pdf?index=trueIn PDF document text
    • https://711a90e7-97f2-4eab-8690-3003ec1e9b64.filesusr.com/ugd/a0905b_4090a2e385cd4033b68b15a7b975b7e5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lomiwexuva/android_spinner_arrayadapter_object.pdfIn PDF document text
    • https://73a1781f-5c9f-4c76-8a11-a8e8c44f336a.filesusr.com/ugd/d9f7b5_aaf91c5821214cf18fc817c5dc8bfdf8.pdf?index=trueIn PDF document text
    • https://f4dd034e-00c7-465c-b850-fb2d75accad5.filesusr.com/ugd/769f78_290b8be78a474ff89fda303348d84a11.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8B 4604 bytes
SHA-256: cfae89344e9131ef59d255dedd720c5397b8bfc80227d53ac4bd63c8f90741a8
font_01_sfnt_off0000eb42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB42 11484 bytes
SHA-256: 5f820de5a4af9e72d7ea1735912c7d48df06c0e3b0b7a34551912f53b94a61c9
font_02_sfnt_off000110a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A6 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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