Malicious PDF — malware analysis report

Static analysis result for SHA-256 d85561bbff5a01e4…

MALICIOUS

PDF

79.2 KB Created: 2021-05-27 14:36:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 636efb38def732074d8d97b1722e01a5 SHA-1: 5b614e61db23b0cfe7fe2ef3c5ed6226d7c49ec3 SHA-256: d85561bbff5a01e476bc3d77da9647d90313b324c65444852278cff4bf316d67
244 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of embedded links, with at least two pointing to known malicious redirector infrastructure or disposable hosting. The primary purpose appears to be a link farm designed to direct users to external, potentially harmful, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://yafferge.ru/strik?utm_term=low+glycemic+index+food+list+in+urdu In PDF document text
    • https://xasopivuzag.weebly.com/uploads/1/3/5/3/135333163/tanuf_lolitotumexirag_verixe.pdfIn PDF document text
    • https://busegozujukot.weebly.com/uploads/1/3/0/8/130874370/6b6d58ba.pdfIn PDF document text
    • https://fofosaja.weebly.com/uploads/1/3/4/2/134234592/6c38c431a5f331f.pdfIn PDF document text
    • https://supuzuvafexag.weebly.com/uploads/1/3/5/3/135383103/tavaxewadewa.pdfIn PDF document text
    • https://kuwavumiwedow.weebly.com/uploads/1/3/4/6/134673312/gigozapevusuvezifun.pdfIn PDF document text
    • https://lovokavupas.weebly.com/uploads/1/3/0/7/130776776/bf04e.pdfIn PDF document text
    • https://doxujivadew.weebly.com/uploads/1/3/4/8/134875716/b190486a.pdfIn PDF document text
    • https://nulijuvak.weebly.com/uploads/1/3/3/9/133986618/df2fcb688c9d.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/280193c4-f154-4fe5-9d21-dbd389299286/importar_un_certificado_en_google_chrome.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1d75229-c426-403c-a85f-58bfa4b32593/the_covenant_2006_full_movie_in_hindi_dubbed_youtube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4569ad13-c590-4efd-b2d4-89cc4b240648/marvel_movies_in_order_to_watch_on_disney_plus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27178b6d-8604-426a-a46d-b2f9e5cf3f76/80774028570.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa2ce0d1-8ffa-455f-ad00-d61f315c3b89/lonely_planet_magazine_india_september_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a6aa0d0-716c-47e3-9fbf-f2b3c8e4ec4d/how_to_learn_technical_analysis_for_trading.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7698bf2-779b-483b-9b85-eec1d32271be/crazy_love_lyrics_beyonce.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21c62917-6126-4e9f-b94f-7ab686e253b9/will_there_be_a_firefly_reboot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2098d0f5-e1ce-4f10-b3e4-0d02b1a917b6/what_are_the_8_main_principles_of_the_data_protection_act.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18a98b87-25ac-4558-a48c-dd6fc120ac76/contrato_de_arrendamiento_de_vivienda_word.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18c5d2a5-46a1-4856-a73f-3ce4fbf24379/ludepabogowaxagitusoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29846100-9a53-46d1-a1f3-e70e3068fa08/lanofife.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcd745bf-3426-4208-b267-e66cc2612022/tinogoxuwojapefopemo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f2026a2-bb9b-425e-ac96-a191b5281a10/what_devices_can_logitech_harmony_control.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_off0000f6f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F3 5332 bytes
SHA-256: 016b4269e15b98b68b72a1c5c8ebede0039cc52d8dead76bb9a0da774cad0a2a
font_01_sfnt_off0001092f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092F 11216 bytes
SHA-256: 7762893ef68cd8b97af6e4f0495a75b034253a3e732b62ef2dffc7e0c6b23e08