Malicious PDF — malware analysis report

Static analysis result for SHA-256 5493e194f64c874e…

MALICIOUS

PDF

79.0 KB Created: 2021-09-21 04:50:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 98c2d8559b209ee28cb4b858ee308857 SHA-1: 76260f54a6950f425cd72958aefc04023fbdf72b SHA-256: 5493e194f64c874e7bb5c4e64b9c65e3bba8cd34c7fe89a16104db37feb16798
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, many pointing to link farms on disposable hosting, suggesting a phishing or credential harvesting operation. The PDF structure and embedded URLs are consistent with a spearphishing attachment 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://crewmak.ru/uplcv?utm_term=free+sms+from+net PDF link annotation
    • https://zhongzing.com/uploads/files/202109111711377772.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/pubizirak.pdfIn PDF document text
    • http://servis-hradec.cz/files/file/sefulilajewixafivadomuv.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/fipaburunalidimozuvi.pdfIn PDF document text
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/50427708418.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/wusolutelitob.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/3gk5da9ph52c45hv81r73muneb/wabogazikivutodoxu.pdfIn PDF document text
    • https://saunadlaciebie.pl/userfiles/file/regoliburafi.pdfIn PDF document text
    • http://architettosirocco.it/userfiles/files/63144609352.pdfIn PDF document text
    • http://universalestetic.com/userfiles/file/9253944479.pdfIn PDF document text
    • https://medtek.vn/storage/file/67066590098.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/90843728937.pdfIn PDF document text
    • https://delta-relay.be/userfiles/file/nifabakojelituvu.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/minadanatarimel.pdfIn PDF document text
    • http://qdjshg.com/files/file/74337604738.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/51837795627.pdfIn PDF document text
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/16809542317.pdfIn PDF document text
    • https://porfic.com/fotos/file/kisunus.pdfIn PDF document text
    • http://zabbeleecooking.com/ckfinder/userfiles/files/tedipelopawazopusewupo.pdfIn PDF document text
    • https://bushregenerators.net/userfiles/files/7978316417.pdfIn PDF document text
    • http://szkolaprywatnaleszno.pl/userfiles/file/2598699229.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16143e4e7c76f3---82272696749.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210918071402.pdfIn PDF document text
    • http://vecsecity.info/editor_up/vopiwixomuxapuzagolikozuk.pdfIn PDF document text
    • http://uelzecht.lu/userfiles/files/92388295751.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_off0000d34a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD34A 17232 bytes
SHA-256: 257fc9d40506e1640304650b2a77b8060f22bc711298195bb613ddecb4785b20
font_01_sfnt_off0000fff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF8 10052 bytes
SHA-256: 17cec09111de4d20a9411aa8722d78b73395c51543d90d448233a76016167eb2
font_02_sfnt_off00011650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11650 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1