Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ba6da70f85d8dc5…

MALICIOUS

PDF

75.0 KB Created: 2021-03-23 23:42:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5d5a24ec03795e32450590bb22549e70 SHA-1: 6286a7b3feb189f942d5fadf6f27af926e5e8263 SHA-256: 7ba6da70f85d8dc51d027dc2fa304be7fd8d9b13cd1a2baae397f9010b7c692d
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to suspicious or unknown domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' suggest the document is designed to redirect users to malicious sites, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://yafferge.ru/123?utm_term=blouse+cutting+video+in+tamil+free
    • http://bukupiduge.mypressonline.com/how_to_read_her_body_language_if_she_likes_you.pdf
    • https://cdn-cms.f-static.net/uploads/4369784/normal_6030381a8ef07.pdf
    • http://sberbank.link/buleboxamewusuzewezozuwk1lts.pdf
    • http://wozuxel.getenjoyment.net/already_yet_worksheet.pdf
    • http://cosmicgig.com/learn_to_weld_course_ukpfn82.pdf
    • http://tubujefowabe.medianewsonline.com/sapuwisopeno.pdf
    • https://cdn-cms.f-static.net/uploads/4485162/normal_6044caafb754f.pdf
    • http://form-lnstagramverificationbadge.com/garrett_ace_250_metal_detector_how_to_usep75ft.pdf
    • https://static.s123-cdn-static.com/uploads/4480149/normal_5fee4f9583cea.pdf
    • http://bumufirila.mygamesonline.org/19364824646.pdf
    • https://static.s123-cdn-static.com/uploads/4456676/normal_5ff181cf802d4.pdf
    • http://birapemotafew.mygamesonline.org/important_dates_in_all_months.pdf
    • http://mofonuf.medianewsonline.com/witepumitiso.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sazomo/goal_setting_worksheet_for_esl_students.pdf
    • https://54179944-c6a3-49b3-9462-5d1939b6aff2.filesusr.com/ugd/49f5ef_93a6b8835688418983c74bd5844a324b.pdf?index=true
    • https://s3.amazonaws.com/nitirew/manual_lombriz_roja_californiana.pdf
    • https://s3.amazonaws.com/kufazete/centrifugal_pump_performance_curve_characteristics.pdf
    • https://s3.amazonaws.com/silubebebefuju/aorta_scan_guidelines.pdf
    • https://de99c131-68bf-4271-bcef-cda292486844.filesusr.com/ugd/f5892c_a54efdf7eef442c8a171720d153f318d.pdf?index=true
    • https://s3.amazonaws.com/rakabexozu/25030794483.pdf
    • http://negumigimewote.onlinewebshop.net/used_tesla_model_3_for_sale_in_las_vegas.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8bc.bin
0e27e6fbb10a571ef58629ae1099844a3d71e476ca29408b2fb37d17f215c1e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BC 5452 bytes
font_01_sfnt_off0000fb3e.bin
50d6b03ef63e9df897144a0e00c29b5207fb4894f7bc3c19f9a1b1ff3396bd98		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3E 10472 bytes

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