Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb3583d8d4c0fc74…

MALICIOUS

PDF

82.5 KB Created: 2021-09-24 02:11:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a1bdfa674f0b0d2fdce98f17d84de8df SHA-1: 17090d3e2b11201c84244ad690a98097436dac5d SHA-256: eb3583d8d4c0fc741496f7b53d670befe05863ef498c47998e5d6930cbc211e2
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged by an ML classifier as malicious and contains numerous embedded URLs. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates that the PDF is designed to host many links on disposable domains, a common tactic for phishing or distributing further malicious content. The presence of many unknown reputation URLs supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 4

  • 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 http://nemalipics.com/gisujibupavana.pdf In PDF document text
    • http://mnogonomerov.ru/uploads/file/kisonalemodizaganamofa.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/virapijipujoxexaz.pdfIn PDF document text
    • http://i-dron.cz/data/file/nejixululilumuninuku.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/mefujapidokiku.pdfIn PDF document text
    • https://fuoriscena.eu/file/18728993821.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/22608905412.pdfIn PDF document text
    • https://gospel-streams.com/asset/ckfinder/userfiles/files/22170062597.pdfIn PDF document text
    • https://indoshaolinkungfusociety.com/ckfinder/userfiles/files/zixoviwuxiderebebebugoj.pdfIn PDF document text
    • http://luluscafeonline.com/uploads/files/piretugasegiwom.pdfIn PDF document text
    • https://yapluka-services.fr/userfiles/file/josinedowibedajivezusoro.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/dozupukoxesaxitosaterupu.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/fudemem.pdfIn PDF document text
    • https://gulf-rope.com/images/bulk_images/files/wimod.pdfIn PDF document text
    • http://kredoteka.ru/uploads/file/49392924556.pdfIn PDF document text
    • http://it-hair.com/userfiles/6680811346.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/85704412696.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/41632862704.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/kofizefivedabewi.pdfIn PDF document text
    • http://cdenito.net/userfiles/file/tonatowojoj.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/34734334192.pdfIn PDF document text
    • http://sinoscaform.com/upload/ckimg/files/202109101433241607.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/c1859eaaacd5a1b21462efca6493dad3/rajibezep.pdfIn PDF document text
    • https://kclandscapes.com/ckfinder/triplebuserfiles/file/19759303948.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=watch+step+up+3d+online+freePDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD40 17636 bytes
SHA-256: c0c0bea632eb9136b330b996cc142d7e13524791e6e5dd8897d6b9c98d95e004
font_01_sfnt_off00010ac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC7 10980 bytes
SHA-256: 6f93741133212eff42bd9d5590a2fa45133c3fd4fb2587b00e99194c30286c4d
font_02_sfnt_off0001243d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1243D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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