Malicious PDF — malware analysis report

Static analysis result for SHA-256 62b1cba45b41c598…

MALICIOUS

PDF

75.3 KB Created: 2021-03-06 22:01:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 3f2da89142b2b1e788bf9b5c7e5374f8 SHA-1: b957e60e415099c3e9e73a84148a84814f5d8ae0 SHA-256: 62b1cba45b41c59889d4e90e7922c3e4c0810bfe5afdd923dcee8deffacf66b4
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable hosting services, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • 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.
  • 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://gimoguvi.ru/award?keyword=cuando+te+pegas+en+el+codo+que+significa PDF link annotation
    • https://cdn.sqhk.co/xuzuvazol/jbJidgj/polda_6_cd_key.pdfIn PDF document text
    • https://gokotaxoka.weebly.com/uploads/1/3/4/1/134109163/goxisa.pdfIn PDF document text
    • https://moluzepin.weebly.com/uploads/1/3/1/8/131856103/8435074.pdfIn PDF document text
    • https://cdn.sqhk.co/vafizolubev/ejhyOjc/bawuwaka.pdfIn PDF document text
    • https://cdn.sqhk.co/mujawiru/MibHhaz/nazinujejubideluzolu.pdfIn PDF document text
    • https://cdn.sqhk.co/fapetemiji/hdiJEgi/descargar_emulador_nes_para_android_mas_roms.pdfIn PDF document text
    • https://pakimisubimoge.weebly.com/uploads/1/3/0/7/130776027/1708756.pdfIn PDF document text
    • http://dilawiputonu.mypressonline.com/bmw_x1_remote_control_battery_replacement.pdfIn PDF document text
    • https://cdn.sqhk.co/vinasujitupe/HgiSogi/magic_poser_app.pdfIn PDF document text
    • https://cdn.sqhk.co/zedozomi/hGKiagi/wepalirirulovukofizi.pdfIn PDF document text
    • http://falorilipeb.mywebcommunity.org/the_language_of_composition_second_edition_teachers_edition.pdfIn PDF document text
    • https://cdn.sqhk.co/padumaxifop/jbeGHx4/tiluniganazajufemidipofum.pdfIn PDF document text
    • https://ropujumidud.weebly.com/uploads/1/3/1/4/131406541/gukagumisumaw-megawomix.pdfIn PDF document text
    • https://fubomagasikeka.weebly.com/uploads/1/3/4/4/134474343/1325e37.pdfIn PDF document text
    • https://raralulewuk.weebly.com/uploads/1/3/4/4/134478892/suzusubizig.pdfIn PDF document text
    • http://sowoxapexemex.sportsontheweb.net/roomba_battery_icon_flashing_red.pdfIn PDF document text
    • https://cdn.sqhk.co/mepetiruzi/gqMibja/infection_control_certificate_usf.pdfIn PDF document text
    • https://wulukisogexoz.weebly.com/uploads/1/3/1/4/131438059/memudozejipem-vogejopotozagag-mevigarilip-wedubewipojuve.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7b4e975e-109f-4397-a679-93e438ff1453.filesusr.com/ugd/c33f71_3149f123e0cb425f9568fcabb63db0c7.pdf?index=trueIn PDF document text
    • https://8c56b32b-3398-45d6-9c0b-b55146621f16.filesusr.com/ugd/6924eb_81d186e284fc46698d98ee68d6a656c9.pdf?index=trueIn PDF document text
    • http://wugujub.onlinewebshop.net/como_fazer_um_convite_de_aniversrio_digital.pdfIn PDF document text
    • https://f4dd034e-00c7-465c-b850-fb2d75accad5.filesusr.com/ugd/769f78_e8ba8d78f62e4fbc847afbd58b3f9926.pdf?index=trueIn PDF document text
    • http://fazaburifug.myartsonline.com/14675619847.pdfIn PDF document text
    • https://ff0b3df2-dc61-4aeb-9024-93fa9b5bc175.filesusr.com/ugd/aa14a9_ca92a945d19449fb9cc607c334a4706b.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_off0000e8d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D7 5260 bytes
SHA-256: b2e9d7c982c9f2291a8e5369cf02925e77017cc4bc796c070e2eafa40c1151aa
font_01_sfnt_off0000faca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACA 10836 bytes
SHA-256: 999a7632c7befb6bcb5e21d7778f400928dae07a14142d34cb726d4e0fbd72b8