Malicious PDF — malware analysis report

Static analysis result for SHA-256 94a6c939a42552df…

MALICIOUS

PDF

74.4 KB Created: 2021-09-09 00:53:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 2d041beb51acc3d7ae5eadbcfeb004e0 SHA-1: 8e332acc9a088f659a7735eebf8f672de3301a65 SHA-256: 94a6c939a42552df99981fdf5ea8805f6dc8f0b39a59d517e12c1b23ac1330c3
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to disposable hosting, suggesting a phishing or malware distribution attempt. No scripts were extracted, but the presence of many unknown URLs points to a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://gaestehaus-am-erlkoenig.de/img/editor/file/96476395948.pdf In PDF document text
    • https://sysyanginguvenlik.com/uploads/files/22511557655.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/fovopozobonumelobo.pdfIn PDF document text
    • https://technoarc.net/userfiles/file/56000384311.pdfIn PDF document text
    • http://siciny.pl/userfiles/file/dijomarokijululanixanati.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/28938220360.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/43252088050.pdfIn PDF document text
    • http://sibzakon.ru/ckfinder/userfiles/files/44340132528.pdfIn PDF document text
    • https://saglamahsapkutu.com/img/editor/image/file/75973574364.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/zanowolup.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/26582331399.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136318753363---lotejepovulolub.pdfIn PDF document text
    • https://casadko.fr/userfiles/file/wobotupujofatepar.pdfIn PDF document text
    • http://yourhandmadeitems.com/userfiles/file/towevezatogamezel.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161325f52bb145---49542899394.pdfIn PDF document text
    • https://laptopserwis.com/app/webroot/media/files/vutizovupadudoran.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/zomabazotaxik.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/44176754040.pdfIn PDF document text
    • http://prepearl.com/uploadsfile/3995268451.pdfIn PDF document text
    • https://lodoshosting.com/calisma2/files/uploads/69488014959.pdfIn PDF document text
    • http://a9188.com/upload_files/art_files/files/20210908_034012.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/gipus.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/tejebevumususoduge.pdfIn PDF document text
    • http://woodbridgeabw.com/uploads/files/14854953872.pdfIn PDF document text
    • https://actionsporting.com/userfiles/files/zutufokevumubowu.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/zitad.pdfIn PDF document text
    • http://headrepublic.pl/images/files/64492000550.pdfIn PDF document text
    • http://aylabawadi.ae/userfiles/file/2825239032.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+set+downloaded+ringtone+in+androidPDF 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_off0000c0b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C7 10500 bytes
SHA-256: 1e34a47d921c797e00b0d48a10621194e1e38f9afe8c07f7f84d98b7b60a599c
font_02_sfnt_off0000f093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF093 16604 bytes
SHA-256: e7e65e8104052098710fae820c05db3b4d7182ef3baf510266e570faef42ca07