Malicious PDF — malware analysis report

Static analysis result for SHA-256 d207e3da3d800405…

MALICIOUS

PDF

75.7 KB Created: 2021-03-10 10:35:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 210113707d6f2d794ab55d2b229bf9b6 SHA-1: a13da2c8a4c62a7c57d3ab957d50f7a75e96e534 SHA-256: d207e3da3d80040517299c71f67ae6d1910ffac323bd89fcb5190c373a5438cd
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains a large number of embedded links, many pointing to disposable domains and redirectors, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the links and the PDF structure suggest it's designed to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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.
  • 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://dafemum.ru/aws?utm_term=astrology+for+beginners In PDF document text
    • http://getveran.site/washington_post_covid_articledp8m7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475866/normal_5ff5ef0dd9422.pdfIn PDF document text
    • http://cpskras.website/tiktok_video_downloader_without_watermark_for_iphonefnzxr.pdfIn PDF document text
    • http://ziduruwekomowob.iblogger.org/how_to_animate_with_ipad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454990/normal_5fee47a628439.pdfIn PDF document text
    • http://sdek-24.cc/adler_barbour_cold_machine_dcm-128ec6z.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/2a758493-853f-4650-bf70-2131cfb311ad/53396128173.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1284a205-ae54-43bb-b66c-6f08c511efa5/can_pizza_be_cooked_in_microwave_oven.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2f0e4ef-48d2-4077-b4ae-9778a741820b/pekab.pdfIn PDF document text
    • http://xaselivubol.rf.gd/4932954672.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/568ccfc7-da1a-4b61-aeee-fafe675a9a8a/doxuturofovibopolajevumot.pdfIn PDF document text
    • https://033a7475-7ccb-45c1-8f1e-38fd320d48d0.filesusr.com/ugd/03a576_7b7902233385418bb383e8e98f6cb78c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f551f5a0-345a-4da1-80f3-58753294bb86/kufavitopis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98e84f88-ea30-4dda-a806-d22ac85fdc5a/english_vocabulary_words_with_meaning_in_marathi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a6d5fd4-8f5c-438e-933c-16118017a940/betokokufe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5542985c-b304-4a78-ba6e-41bcc274b131/48702614688.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/162edf59-13ca-45e3-b2cc-7000f2494b37/stage_rigging_handbook.pdfIn PDF document text
    • https://05f6fcc2-a4c7-4d5b-b58c-97b640a93f4d.filesusr.com/ugd/74147a_49ffcc96da914c8b961e5dddccfe8246.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9B 4956 bytes
SHA-256: 0d15a137d16c71c13819cf64fbf9177cbaf59807a3062227386d1434978b72fd
font_01_sfnt_off0000fe96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE96 10328 bytes
SHA-256: 414b5e58357cc553cf4a6f6234654f70aaa688f0f84ba491b5e8ed7204f44976