Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fbf4562f5b28346…

MALICIOUS

PDF

70.8 KB Created: 2021-09-26 14:46:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b32d46be73619049932638a3b8a33c89 SHA-1: 6d8fe88b1efc0780bc5d0c36eeda126d1720cfad SHA-256: 7fbf4562f5b28346eea687654c2420923730d9418405241d767da511bce85663
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document is part of a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect the user to malicious content, likely for initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.terresdescaraibes.fr/file/12659063736.pdf In PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/161419e24e9158---fojadofezet.pdfIn PDF document text
    • https://bisleri.genefied.co/ckfinder/userfiles/files/davorusilaj.pdfIn PDF document text
    • http://damnoen.com/ckfinder/pho/files/74085034158.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/161415b48689a6---jujiwapafexelesevatur.pdfIn PDF document text
    • http://wrtour.com/FileData/ckfinder/files/20210901_B0E3E831D9F8C12C.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/98372561406.pdfIn PDF document text
    • https://www.disbel.es/ckfinder/userfiles/files/momarubuwakebubodijafelat.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/66859308487.pdfIn PDF document text
    • http://avtokit116.ru/!upload/files/nufuvirefes.pdfIn PDF document text
    • http://masterref.ru/editorfiles/file/82719514912.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/junomupaka.pdfIn PDF document text
    • http://mindennapi.hu/upload/file/zewijide.pdfIn PDF document text
    • https://groupunsur4.com/contents/files/13602300359.pdfIn PDF document text
    • http://alfatreyd-mebel.ru/archive/images/file/91950486767.pdfIn PDF document text
    • http://01host.ru/userfiles/files/naguzosirebapuz.pdfIn PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/finotozalilojejapiludejib.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16130baed949d1---faxinovodoremurunexi.pdfIn PDF document text
    • http://kdwatch.net/upload/files/2021090923541397.pdfIn PDF document text
    • http://waxiangyuan.com/upload_fck/file/2021-9-14/20210914034956200008.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/zebobuzovefebosusaraga.pdfIn PDF document text
    • http://alpes-maritimes.proximeo.com/ckfinder/userfiles/files/damamuxawumosoge.pdfIn PDF document text
    • https://sanmuabancongty.vn/images/content/files/sisujeradutiwilajapuki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=acr+call+recorder+android+11PDF 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_off0000b0f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC907 17848 bytes
SHA-256: 3f0fd35639bcc4cb09662d7c595bd1758a201f8eeb4f2670d488da5fc82346fc
font_02_sfnt_off0000f710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF710 10128 bytes
SHA-256: c68791f187e6e0018f09cc7a790bb6cf43abbef16639d10bcb1af5f7012fcb7f