Malicious PDF — malware analysis report

Static analysis result for SHA-256 43b7adfc1ee5f9c4…

MALICIOUS

PDF

80.0 KB Created: 2021-09-12 01:08:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9a7697ec4dc927e2ef41a0de4557c019 SHA-1: 5ca8adf7b3b042bf21a0df0ad2ea426216023b86 SHA-256: 43b7adfc1ee5f9c4927f50a552ed3d0c082f5ddd4f23d4b96dd94ff2ba6d5eb7
134 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a link farm with numerous disposable hosts and a deceptive 'download' lure suggests a phishing or malware distribution attempt. While no scripts were extracted, the structure and embedded URLs point towards a social engineering attack designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c362facbd5---zalizilujorupajakemisegap.pdf In PDF document text
    • http://bnblspecialities.com/userfiles/files/marubamuvazubuki.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/16066943387.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/diwuzatuza.pdfIn PDF document text
    • https://partetesal.ir/data/file/11695816852.pdfIn PDF document text
    • http://kyea.org/imageuploads/46037275937.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/modolulapagozaronosov.pdfIn PDF document text
    • http://prefinancovaniehypoteky.sk/res/file/vurimofadimusutakemitali.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/todesefetifosenezesot.pdfIn PDF document text
    • http://evolution-dev.com/file_media/file_image/file/16511044015.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/80516408504.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/11458012009.pdfIn PDF document text
    • https://peisheng.org/uploads/ckfiles/files/612eca75b9006.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613388627161e---mufepive.pdfIn PDF document text
    • http://hrudolf.com/userfiles/53374404909.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/pokapixijoseva.pdfIn PDF document text
    • http://choragwica.pl/userfiles/file/15542087487.pdfIn PDF document text
    • http://tianlanlawyer.com/filespath/files/20210908172151.pdfIn PDF document text
    • http://www.aragonemprendedor.com/userfiles/files/gelomezetibamu.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/52745838683.pdfIn PDF document text
    • https://irantruck.ir/data/file/68605089422.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/65508392141.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=download+apk+file+free+firePDF 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_off0000d22e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD22E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA40 18936 bytes
SHA-256: 27c05ceba5ab4569064a27813e7ae5d39a51e0ae1c4326b455493864ff2551bd
font_02_sfnt_off00011b33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B33 10404 bytes
SHA-256: d207fb0c4b061406d55f97dcf7d37260459b7cdbaab608bdd4d30c802d457093

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