Malicious PDF — malware analysis report

Static analysis result for SHA-256 da2ef9022acdf619…

MALICIOUS

PDF

80.8 KB Created: 2021-09-24 12:22:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: aad2de75326c82ad4c8c0f94e8f4d32c SHA-1: 3e7029d58c8f5e3f2b78294db9b3a5b088358471 SHA-256: da2ef9022acdf619e31c9e5eb5fc44af89108a810c07c232b990fbdab7b600c3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. The embedded URLs, particularly the one on 'satisfytech.com', are suspicious and likely lead to malicious content or phishing sites. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest an attempt to redirect users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://satisfytech.com/ck/upload/files/dukiramuzofadarila.pdf In PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/96529352952.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210918080324.pdfIn PDF document text
    • https://md-bud.pl/szklo/photos/file/90887484397.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/39a64a560a913b03e72914e339f03614/23078982462.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/86692247499.pdfIn PDF document text
    • http://rockbond-aac.com/id-admin/fckImages/file/sofosalilewivepasuti.pdfIn PDF document text
    • http://nanoservice.cz/upload/file/20913645501.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021091117575573499.pdfIn PDF document text
    • http://thesciencenetwork.org/uploads/files/mudijolinuwiwewuso.pdfIn PDF document text
    • https://bodzlomu.com/userfiles/file/ketamodejevepozi.pdfIn PDF document text
    • https://lyna-garage.com/htdocs/cljr/data/files/11296087940.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613132ec2a3df---69792793766.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/52780461622.pdfIn PDF document text
    • https://stabiactiv.com/userfiles/file/10279768616.pdfIn PDF document text
    • https://bipalisdemo.dashindonesia.com/userfiles/files/laxapubazazupobix.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/93119358222.pdfIn PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/55892484708.pdfIn PDF document text
    • https://tkbhanna.com/ckfinder/userfiles/files/tuwamimonamax.pdfIn PDF document text
    • http://torremaggiore.sitmap.it/files/files/12163056955.pdfIn PDF document text
    • http://cargologicru.com/sadm_files/6728798308.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/54808290143.pdfIn PDF document text
    • http://lysfyyy.com/upload/files/gugimewejug.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/10326053711.pdfIn PDF document text
    • http://ventss.ru/userfiles/files/kizoxi.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/116527447.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=oxygen+thief+pdfPDF 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_off0000dceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF502 10424 bytes
SHA-256: 60c1aa2bcbb83dbf0cc5276089ae180838cac8581dde13a10e256b5b47349f43
font_02_sfnt_off00010c63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C63 16012 bytes
SHA-256: ef43eee40897bd8beb42add019ba7928912b056e7a87ab3641647622810182e2