Malicious PDF — malware analysis report

Static analysis result for SHA-256 21d4b4d664d94259…

MALICIOUS

PDF

80.9 KB Created: 2021-09-14 05:42:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7cf384760f789d1cb8f35699288947c7 SHA-1: 1f55c06df622e79f57816769dfe3c18e18abff1c SHA-256: 21d4b4d664d94259c0db0289740089e6faa583785ae92cc14e6f2440d2fe1991
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, indicative of a link farm designed to host malicious content or phishing pages. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://synerhu.ru/uplcv?utm_term=borrar+historial+de+busqueda+google+en+android PDF link annotation
    • https://eklyps.net/images/file/kajezizuvowigajik.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210902_FD2E28B165D780AF.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/38230344420.pdfIn PDF document text
    • https://partetesal.ir/data/file/winagosuwupejagujem.pdfIn PDF document text
    • http://olddieselparts.com/ckfinder/userfiles/files/xefavob.pdfIn PDF document text
    • https://airin.lv/images/userfiles/file/bowikixomalovokezasej.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/wegesasimatevofata.pdfIn PDF document text
    • http://tradotel-riviera.com/file/17698124036.pdfIn PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/68619817033.pdfIn PDF document text
    • http://sanyosushiglendora.com/uploads/files/61969135558.pdfIn PDF document text
    • http://h-p-n.fr/catalogue_dynamique/file/sobewisolo.pdfIn PDF document text
    • https://kitapkapla.com/upload/ckfinder/files/woledelobirasi.pdfIn PDF document text
    • https://infrapanel-alegjobbfutes.hu/userfiles/file/kuneketi.pdfIn PDF document text
    • https://ustunbilgisayar.com/userfiles/files/likogonekudixev.pdfIn PDF document text
    • http://greenflameenergy.com/userfiles/file/12802822273.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///21561163591.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16135d28202949---viwozizepewepigog.pdfIn PDF document text
    • http://qapoll.com/2015/vat/upload/files/48594625242.pdfIn PDF document text
    • http://motovelo-nmsk.ru/userfiles/file/juxakokoguwidonutoniti.pdfIn PDF document text
    • http://juditphotography.com/picture/userfiles/file/19226769297.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/46092122728.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/84111919673.pdfIn PDF document text
    • http://hastensandbreakfast.nl/userfiles/file/nitedunagaji.pdfIn PDF document text
    • https://alstar.uz/images/shared/file/somawa.pdfIn PDF document text
    • https://arendic.cl/files/maxofesi.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_off0000d3e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFC 10968 bytes
SHA-256: 8872f915f3b23db881acb0079fe6b2a83d121f6a4145c88a09b14a270bb0d1d6
font_02_sfnt_off000104db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DB 18956 bytes
SHA-256: e2720358e7b8032322bcfee86fda1ae206849eb13f45e08ddbf3893de2017422

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