Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed1f4f87900922ee…

MALICIOUS

PDF

95.1 KB Created: 2021-03-29 00:42:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 77a0406225c0e88e3e14aba7f0a279fb SHA-1: eef61f2791a92581f8ac9d33af17fb068df5969b SHA-256: ed1f4f87900922ee70ac053b002fd6dbb27605e2f9e81637fefc663a01592964
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity, likely related to phishing or SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://soxebez.ru/123?utm_term=coliformes+totaux+eau PDF link annotation
    • http://arfeshome.com/muzuzetotaloditugudavogvcwfv.pdfIn PDF document text
    • http://gebuhrenfrei-mein.com/746692642214uf1o.pdfIn PDF document text
    • https://cdn.sqhk.co/jefapukawore/63hcphb/city_builder_road_construction_mod_apk.pdfIn PDF document text
    • http://xviiivbgz.com/la_divina_comedia_de_dante_alighieri_sinopsisch8vo.pdfIn PDF document text
    • https://cdn.sqhk.co/ketifoseja/u0Thjii/30290643892.pdfIn PDF document text
    • https://cdn.sqhk.co/jarixizotib/jjcggei/gallery_63_location.pdfIn PDF document text
    • https://cdn.sqhk.co/kigimole/cjc02jg/renakabazorofaw.pdfIn PDF document text
    • https://cdn.sqhk.co/vasibejovej/gfjcsaY/by_the_seat_of_my_pants_example_sentences.pdfIn PDF document text
    • https://cdn.sqhk.co/bidomutarili/ibJh0ic/animated_animal_videos_for_babies.pdfIn PDF document text
    • https://cdn.sqhk.co/suxepemup/giggePd/17669482515.pdfIn PDF document text
    • https://cdn.sqhk.co/samofetob/9NhhOZM/96870743663.pdfIn PDF document text
    • http://fb-pageunderreview.com/mudepoluge3xzm.pdfIn PDF document text
    • https://cdn.sqhk.co/vixukose/geiibij/t_i_fall_guys_mobile_ios.pdfIn PDF document text
    • http://beremoter.online/twilight_2008_full_hindi_dubbed_movie_online_free48t7p.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://67d298e0-85f4-4ad4-bf36-e1ac857e42fc.filesusr.com/ugd/b6bf5b_576d6749e3e643e58d06b3af8c0ed614.pdf?index=trueIn PDF document text
    • https://0491f86b-060d-4f4a-be23-b0d01488777f.filesusr.com/ugd/faa7ef_6b87794615c54f2bb591e4ebb66068ca.pdf?index=trueIn PDF document text
    • https://91e55214-10ad-44cf-a10a-60a9392df58b.filesusr.com/ugd/e1c37d_412011c5d3a5429ab0cb5f28a0df06fa.pdf?index=trueIn PDF document text
    • https://3ae4d138-4ba3-4962-98fb-1b98b40a6a82.filesusr.com/ugd/38062a_a39e06d912ee4958ad1ca91fab5e46a3.pdf?index=trueIn PDF document text
    • https://451cdc1f-766e-44a1-8a9d-f9db2ecad5ed.filesusr.com/ugd/0f0d48_a98a4bb06ce0440f8994125c5e0272f7.pdf?index=trueIn PDF document text
    • https://d0a6b1b1-1773-4622-8b5e-0ab5990a7ed3.filesusr.com/ugd/b90ba1_956e14467b8a46c79bf2c62397c2a9cc.pdf?index=trueIn PDF document text
    • https://7e079b21-6cfc-4bbc-a8af-001f4930a7f2.filesusr.com/ugd/f66805_e99886491a2f43778af9b8d391520154.pdf?index=trueIn PDF document text
    • https://063758de-fb2f-4258-809e-b727485bfd5a.filesusr.com/ugd/89cda4_9aaf5db1f9e1454991cf50d73513366d.pdf?index=trueIn PDF document text
    • https://411be8f8-4ba1-40b5-9edf-cc4a2c3d5ecc.filesusr.com/ugd/a86d68_0fa7644562af4b898385b0a18d49858a.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_off000131f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131F1 4888 bytes
SHA-256: 189718cc9c5926367c919b0bb371769d7b9ccf4765691116a15e383797e140c8
font_01_sfnt_off00014277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14277 13648 bytes
SHA-256: 19a92d6cc92ce320e6dcc33ce9080d689fb08cb7ac5d3813cba0236dc0190012