Malicious PDF — malware analysis report

Static analysis result for SHA-256 de1e73b77c075562…

MALICIOUS

PDF

85.6 KB Created: 2021-09-16 12:59:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d63af53a28bf261d027bd302429db9ab SHA-1: 082ee8fa870d7e0ec0ee02cbab4abf925bd9dcc5 SHA-256: de1e73b77c075562eea8ed7501a66b237e030733148ffb439237be1dbcba1322
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs pointing to various domains, many of which appear to be disposable or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and numerous links suggest a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://drafthe.ru/uplcv?utm_term=show+my+android+phone+on+pc PDF link annotation
    • https://jotekonybakterium.hu/userfiles/files/fikukakoxunuzopetefokebom.pdfIn PDF document text
    • https://strechybenesov.cz/content/9089866937.pdfIn PDF document text
    • https://www.icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/dojozezatifasofadom.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/46200868043.pdfIn PDF document text
    • https://nstyapi.com/resimler/files/1947814221.pdfIn PDF document text
    • http://floralojistik.com/userfiles/file/nabejumelokol.pdfIn PDF document text
    • http://agama-rc.com/upload/files/mexiga.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/dokepanawelamalerepugexe.pdfIn PDF document text
    • http://chongthamphucthang.com/images/news/files/bodirefilerope.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/94000615813.pdfIn PDF document text
    • http://bbbo.handyfriendship.com/upload/files/wamidutu.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/vilewogegowub.pdfIn PDF document text
    • http://cl-pub.com/files/files/nosoma.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/29393062376.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/87068327624.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/gozozewanaboxolevijel.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/maripaguterevizotudez.pdfIn PDF document text
    • http://smeeing.com/userfiles/files/budumapefisotororesusawu.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388793a8eb7---92310565468.pdfIn PDF document text
    • http://corkpotters.com/images/xewanufubujorexijibabe.pdfIn PDF document text
    • https://bisleriuber.genefied.co/ckfinder/userfiles/files/48267321187.pdfIn PDF document text
    • http://aromaonly1.com/yamituki-n/uploads/files/69661004451.pdfIn PDF document text
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/nuwovuwerelifuvofeve.pdfIn PDF document text
    • http://dbexpertise.fr/catalogue_dynamique/file/2028251933.pdfIn PDF document text
    • http://kvarkeno56.ru/userfiles/file/8857901363.pdfIn PDF document text
    • https://futurefacesmiami.com/uploads/file/zoxasaxijalazagif.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/97535833637.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://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_off0000ea6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6C 17620 bytes
SHA-256: fb7e994466c113fbb568887af16e381b03e02bfb7bcd68b1a186d2a434d21049
font_01_sfnt_off0001187a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1187A 10744 bytes
SHA-256: 38c74edc3658a866bd39a8b08e59b61627e08a8b5ffc089fead902ca00e24e9e
font_02_sfnt_off00013109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13109 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1