Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9d473ca834d6d40…

MALICIOUS

PDF

72.7 KB Created: 2021-10-02 18:56:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d0d2dc029ef2ad2a91d4d7553c3ff9d9 SHA-1: 3cecbb07c4ea413b50c662c0851e198f32feb3b4 SHA-256: a9d473ca834d6d406d7e6de3ae5a72eb60223b2712490a59fc2242cad17559bf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and the overall structure strongly suggest an attempt to lure users into clicking malicious links, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 5

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=pluck+out+of+thin+air
    • http://sourceandsecure.com/uploads/userfiles/file/regawalivodovizofur.pdf
    • https://mpressivelabels.com.au/application/third_party/ckfinder/userfiles/files/pedalibikidoveputumuz.pdf
    • https://menu2uplus.com/images/file/27326862792.pdf
    • https://cfi-registration.amyhalter.com/buzzboxgift/img/userfiles/files/79173679031.pdf
    • https://kochitaxirental.com/ckfinder/userfiles/files/94458943222.pdf
    • http://cathugo.de/res/wysiwyg/file/nederomexafakarutigonupi.pdf
    • https://abriganature.centralcms.cloud/galeria/files/28210554508.pdf
    • http://imhome-listings.com/userfiles/files/gitewaximatuv.pdf
    • http://pincesorvarshop.hu/editor_up/75559262497.pdf
    • https://best-of-geldanlagen.de/userfiles/file/mozutudovavi.pdf
    • http://arci-mp.fr/admin/File/lupokime.pdf
    • http://shinyoungvalve.com/userData/board/file/32941679317.pdf
    • http://adas-muko.pl/photo/file/14654444407.pdf
    • http://www.yemany.com/yemfiles/files/bovun.pdf
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/45755562470.pdf
    • http://king-tableware.com/uploads/files/202109160736578855.pdf
    • https://conexkarvan.com/cache/fck_files/file/40302926851.pdf
    • http://esistore.be/userfiles/file/31471920306.pdf
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/ec66302cd8428d793884424123120f12/kewapofewimo.pdf
    • https://automatisme-portail-bordazzi.fr/userfiles/fichiers/26335057773.pdf
    • https://ckeditor.pamlskovnik.cz/ckfinder/userfiles/files/vepukofetugove.pdf
    • https://studioconcept-stand.com/fck_userfiles/file/25521549374.pdf
    • https://bisleriuber.genefied.co/ckfinder/userfiles/files/94002428721.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b0a3.bin
97a693020a9c67c913fa5abf5d83a61848c846aa130c5182d8e66f233602b60d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB0A3 2044 bytes
font_01_sfnt_off0000b9f2.bin
5c40f0c1a644d62af0b57e98f37ac396bd34922dec4942cedf49d9eee539b74e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB9F2 10324 bytes
font_02_sfnt_off0000d127.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD127 16792 bytes
font_03_sfnt_off0000e939.bin
bfbd32d6885d6069e22367923ff79b06b4ad0bb46f5c0aa4738fa43c915cdb8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE939 16388 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.