Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3a94a2891ef8301…

MALICIOUS

PDF

83.8 KB Created: 2021-03-16 03:51:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: eb7241f99188c4255c77ea44e839446d SHA-1: 5068d7485d228c7e48f81848d41f722a30162545 SHA-256: a3a94a2891ef83019ca30a107327b47cf349873d5decf546bad7aa3783bd4832
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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 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://kuzutuzo.ru/strik?utm_term=what+is+i+am+that+i+am+in+hebrew PDF link annotation
    • https://cdn.sqhk.co/sejixikerut/Qi6hclV/castle_clicker_chest.pdfIn PDF document text
    • http://megalit-korolev.ru/basic_security_testing_with_kali_linux_2_downloadvcsve.pdfIn PDF document text
    • https://cdn.sqhk.co/volinafi/ivihhqa/ruzamu.pdfIn PDF document text
    • http://socialwave.me/kujegazexodoxarurinipenwqk38.pdfIn PDF document text
    • http://jazabezul.iblogger.org/powusewajikore.pdfIn PDF document text
    • https://zejanedigerexig.weebly.com/uploads/1/3/4/7/134757062/taxotafaziteperum.pdfIn PDF document text
    • https://cdn.sqhk.co/nepofigiper/AJgfNie/offline_videos_for_babies.pdfIn PDF document text
    • http://salopkisa.website/788790734164sqa9.pdfIn PDF document text
    • https://cdn.sqhk.co/javijaxim/eJhjkjc/gotivuta.pdfIn PDF document text
    • https://segurabo.weebly.com/uploads/1/3/5/9/135964373/gabalojig.pdfIn PDF document text
    • https://cdn.sqhk.co/legusovej/okjKJoe/juwoter.pdfIn PDF document text
    • https://fedonofawok.weebly.com/uploads/1/3/4/8/134881994/6460855.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nerokigonone.rf.gd/xuvonijominiwonozobed.pdfIn PDF document text
    • https://s3.amazonaws.com/mojivikapeti/tikasimolulopapalu.pdfIn PDF document text
    • https://s3.amazonaws.com/mukutud/49622937445.pdfIn PDF document text
    • http://wapofele.epizy.com/canon_ip2700_user_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/wipotegadodorek/gopro_hero_5_user_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/395ff531-9713-4e2b-8d0b-a79673072021/clasificacin_de_las_cuentas_patrimoniales_caractersticas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9494f274-1bcb-4b3f-b2a3-6777927b6a4b/how_to_say_hello_in_mandarin_and_cantonese.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a61d468-24fc-4f11-a0d5-5ecce6c613bf/how_to_program_lg_magic_remote_to_soundbar.pdfIn PDF document text
    • http://menimilerawapo.rf.gd/boomerang_tv_hangi_platformda.pdfIn PDF document text
    • https://s3.amazonaws.com/gidibesuxi/xinasevigapusenawugo.pdfIn PDF document text
    • http://mapexas.epizy.com/girl_babies_images_free.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_off000104af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AF 5136 bytes
SHA-256: d783fd79a7d265d681830939cae58d75ca21b81e33b6ddfe6c6e2d31c2de8a3e
font_01_sfnt_off0001160b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1160B 12748 bytes
SHA-256: 58d732c6ab60a458092ed5b2de3c6a56e63faf4600faaeee70312bd48ec22d18

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