Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd4d646b49a26ddf…

MALICIOUS

PDF

76.6 KB Created: 2021-03-05 12:14:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: cbeb22ac5909fac984a9ab4e93262347 SHA-1: 42eff41e170d8611ad0dd6a8b81ac18b9f4fa678 SHA-256: fd4d646b49a26ddfe160841fc6c1b4ba7e57c2410438be59f50067c49b1db891
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to benign resources, but one prominent link to 'midufefew.ru' is suspicious and likely malicious. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan PDF. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic suggest the document is designed to distribute malicious content or phish users.

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://midufefew.ru/wix?keyword=lindlar%2527s+catalyst+formula PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369647/normal_601621244217b.pdfIn PDF document text
    • http://tuworiki.22web.org/advance_tax_challan_280_in_excel_format.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487192/normal_6034fd8315c13.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/fajixe/87991832813.pdfIn PDF document text
    • https://s3.amazonaws.com/nigimul/dokkan_battle_lr_androids_team.pdfIn PDF document text
    • https://s3.amazonaws.com/nafoxuda/bakalsk_prce_ujak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7ee8568-9b9c-42b3-9e42-930ff7cffe89/40197217590.pdfIn PDF document text
    • https://s3.amazonaws.com/kotodur/banomoya_remake_by_tarenzo.pdfIn PDF document text
    • https://s3.amazonaws.com/pubopelej/gale_encyclopedia_of_science.pdfIn PDF document text
    • https://s3.amazonaws.com/jusuberu/capital_ship_management_balance_sheet.pdfIn PDF document text
    • https://77047a80-9f17-4504-a563-a097c25ca12e.filesusr.com/ugd/5c8b2f_1ac85acdea02445f8cfdec0a12660636.pdf?index=trueIn PDF document text
    • http://sekijipaladi.epizy.com/13830452242.pdfIn PDF document text
    • https://s3.amazonaws.com/liluvad/weparizezamopejoweb.pdfIn PDF document text
    • https://s3.amazonaws.com/fekazudabo/65866997323.pdfIn PDF document text
    • https://s3.amazonaws.com/wumodukubaru/natural_resources_canada_fuel_consumption_guide_2018.pdfIn PDF document text
    • https://a22c3535-4c29-4f26-bf6b-1e631d3648e5.filesusr.com/ugd/28986c_b312b2b97fd14a6cb21958541886bf50.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/banula/video_helper_license_key_crack.pdfIn PDF document text
    • http://weralawubuzeg.epizy.com/fedabu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bad3037-30b9-4090-85a6-6179b443c294/26827352061.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_off0000ee26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE26 5244 bytes
SHA-256: 2e769ae06690dffc00a6a2a67665209271973abbce650649a3e1827f1a78c6f9
font_01_sfnt_off0000fffe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFE 10960 bytes
SHA-256: 8786a9db88ade2b366fe11e972ce95dc4415a7b35a1570f98494df9f8b2b5d37

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