Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dce54181a5eb495…

MALICIOUS

PDF

78.5 KB Created: 2021-09-09 03:49:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: d6d4fe85b82b3323a6e70ff36b016119 SHA-1: 8523c4b19e8a1523408f4ac3b7417796f11f5f32 SHA-256: 1dce54181a5eb4952c5724bad0b844558b008efcbbe3ce1ce799397e12099389
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of embedded links, many pointing to unknown domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the nature of the PDF and the embedded links indicate an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://alkoplast.rs/files/nenimuwijupeluwupifawarad.pdf In PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/1fentprcdehnjr6t4jvqohrfd7/33172213553.pdfIn PDF document text
    • http://holzbau-napetschnig.at/48548940378.pdfIn PDF document text
    • http://belloverde.net/emailer/file/48674532140.pdfIn PDF document text
    • http://sartoriaventurini.com/userfiles/files/88355625624.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/nubewanupotasexatuze.pdfIn PDF document text
    • https://xistenze.nagydavid.com/files/files/24339782321.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/35738313465.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/99683787845.pdfIn PDF document text
    • http://holland-ex.com/images/blog/file/72677392165.pdfIn PDF document text
    • https://100tmt.com/uploadimage/files/20210901164938.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/44928373654.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/dafib.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name/files/gelilulewuwesovuzepoxun.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/1872834443.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/dajenijubiri.pdfIn PDF document text
    • http://parikshitconstruction.com/uploads/18833962572.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16136f27aed18c---80306943785.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/pakozatuwawokadivopevuxuv.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/lobelitevoxodudopixak.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/pefalapidomiwadamavus.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/rafabugaxajan.pdfIn PDF document text
    • http://musiclivemarsala.com/userfiles/files/44816869226.pdfIn PDF document text
    • http://gruppocreta.com/userfiles/files/duwipodukofizov.pdfIn PDF document text
    • https://reniuved.it/file/10213684971.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/99738943261.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=factory+reset+my+android+phonePDF 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_off0000cdf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF1 10824 bytes
SHA-256: 209289460bb22eac38f0eb341b9d2a8c05f7003ddaeb95f0e78063aeb1be70dd
font_01_sfnt_off0000e6bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFECF 17708 bytes
SHA-256: a2f9089b807899a17100f8c563ff54efd723b9ac4847f9846d2c339e29cb97fc