Malicious PDF — malware analysis report

Static analysis result for SHA-256 4608b2440553ef0a…

MALICIOUS

PDF

89.7 KB Created: 2021-03-06 14:30:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 7867125549156dee9a14a5cc684fdd8f SHA-1: 316b1dada2a12b7e9f20b4bda9c566fe65ab9baf SHA-256: 4608b2440553ef0a46ab0f79fad642104b474110f4fdbb258fb8ee9110578fc0
214 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure. It contains a large number of embedded links, many of which point to domains associated with link farms and potential phishing campaigns. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the PDF structure itself is used to host and distribute malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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/award?keyword=which+is+the+best+sewing+machine+singer+or+usha In PDF document text
    • https://cdn.sqhk.co/forinabam/agjM0Af/zekunupoguta.pdfIn PDF document text
    • https://cdn.sqhk.co/lowovegoxoji/cgcGhdr/lord_and_master_meaning_in_telugu.pdfIn PDF document text
    • https://cdn.sqhk.co/vorinugobol/fy2NifP/infinix_pop_up_camera_phone_under_10000.pdfIn PDF document text
    • https://cdn.sqhk.co/sisadenev/VjnNPw8/10181328302.pdfIn PDF document text
    • https://cdn.sqhk.co/subilikiwi/dgdjbid/farm_town_cartoon_story_2_mod_apk.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/mogipegi/flyer_white_background_templates_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jujadodedaruxix/lanevo.pdfIn PDF document text
    • https://s3.amazonaws.com/ratixifo/pneumatic_forging_machine_project_report.pdfIn PDF document text
    • https://s3.amazonaws.com/zibenoroduzuw/75268912077.pdfIn PDF document text
    • https://s3.amazonaws.com/lotibabakuj/dashboard_template_bootstrap_w3schools.pdfIn PDF document text
    • https://s3.amazonaws.com/lijulijowivaze/44386669456.pdfIn PDF document text
    • https://82cb18f6-4a40-4824-ac11-10070f72ce02.filesusr.com/ugd/5aec95_74753f4357474285ac9e83620df1eeea.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kagedatabujo/iit_mandi_placement_report.pdfIn PDF document text
    • https://s3.amazonaws.com/rejiner/chromium_older_versions.pdfIn PDF document text
    • https://e216d865-ddc7-438b-99b2-64609380b1bb.filesusr.com/ugd/7ae8b3_a00e5d59c5f54ca69f9962f1c8935085.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jawusawar/waratizakefenizikigaso.pdfIn PDF document text
    • https://s3.amazonaws.com/zunewidimem/w-_4_allowances_form_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/jepinebawo/free_document_translation_software.pdfIn PDF document text
    • https://s3.amazonaws.com/rezugekolaba/xamarin_android_bitmap.pdfIn PDF document text
    • https://6a421494-2577-4416-904f-e17348f56b63.filesusr.com/ugd/85e76a_526a62ca07a34bc1956d8e59361037b5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/goviwigax/46862029565.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_off000122dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122DC 5424 bytes
SHA-256: 4e9e2a4fa3000158c817f567c4361a87e2e4bf2ce1fb75d7bf48794fd8a767a1
font_01_sfnt_off00013541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13541 10404 bytes
SHA-256: 4165b552b4d44253cfd3e3b33686929b19622c659396fc0913944f00821c9743

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