Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d3bbd8a3dc54239…

MALICIOUS

PDF

75.3 KB Created: 2021-03-21 09:48:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 39731b071d0cfdb2b8d9075427a26682 SHA-1: 168f0a6ed9ebd6fdce2f0e7d2215d01fb61eef7a SHA-256: 1d3bbd8a3dc5423985ce2b28c0b8a14559d43f814c1f6bd63bac98b1fd702ca7
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/strik?utm_term=how+to+stop+climate+change+as+a+kid PDF link annotation
    • http://pebunoguge.mygamesonline.org/39534753950.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471941/normal_5fc803fb2f996.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455681/normal_5fee2f93c8335.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495265/normal_6026c953c6003.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475383/normal_603de68d613b0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371791/normal_5fcbea1a3efb2.pdfIn PDF document text
    • http://gitikirazidapi.medianewsonline.com/stereo_isomerism_in_coordination_compounds.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370263/normal_6016fc85bd50a.pdfIn PDF document text
    • http://tegubija.mypressonline.com/75652218277.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488137/normal_603fa24137588.pdfIn PDF document text
    • http://piwulag.sportsontheweb.net/15255802288.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f5c5922-0daf-416d-8b76-0a4355350f4d/what_countries_are_in_world_zone_3.pdfIn PDF document text
    • https://e114ad41-1367-46fe-a5fd-427bf640f69d.filesusr.com/ugd/a63c55_47bd7d9915e54bbb889e560071aeb31f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/954dfcca-b216-44df-9d0c-d1a6d703abab/16802013120.pdfIn PDF document text
    • https://e06e8306-d71e-4c92-aa1b-e8c52eeb44cb.filesusr.com/ugd/bc4951_4d64f199bddb4de48fd392dd429c3bb1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/317281f1-e858-4e31-ae47-6aadc2e70807/dell_latitude_d830_vga_drivers_for_windows_7_64_bit.pdfIn PDF document text
    • https://s3.amazonaws.com/xenavuxa/91193274970.pdfIn PDF document text
    • https://s3.amazonaws.com/jadudusujuje/reference_letter_format_for_school_admission.pdfIn PDF document text
    • https://s3.amazonaws.com/lanorolowu/sniper_elite_4_trophy_guide_ps4.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_off0000e7f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F6 5508 bytes
SHA-256: 3fbeea8f2959a507d7f8fa55bb18eb1622bb7cdc16de4d3f1f169497de4c8558
font_01_sfnt_off0000fa99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA99 11012 bytes
SHA-256: 2890f74b4092b889379157b548c090f59858454a9ccd8940227d1338bc9d3762

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