Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae6a59aa04a43590…

MALICIOUS

PDF

68.9 KB Created: 2021-09-25 13:56:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c9e63133504a1d016aba278efe6b75b3 SHA-1: 1ef6c5495c0d6d926b1941a7074a78d5f27f7de3 SHA-256: ae6a59aa04a43590e909186fe146fe35a3ca45e31821fc77dc0cdc9796f9014d
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as an image-only lure, typical of phishing campaigns, containing numerous external links to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for credential harvesting or malware distribution. The document's structure and embedded URLs suggest it's part of a broader phishing effort.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://huntic.ru/uplcv?utm_term=watch+top+gun+123
    • http://hostingureitings.lv/uploads/userfiles/files/tosudevimosisul.pdf
    • http://alfadent-volg.ru/images_uploads/files/29267465114.pdf
    • https://jungleflightchiangmai.jungle-flight.com/Uploads/files/4512016698.pdf
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413af7eb659---57270305228.pdf
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/dutelelideterasojeg.pdf
    • https://xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/zavixodewodej.pdf
    • http://whatifitspossible.com/ckfinder/userfiles/files/wezovedixezakajodofek.pdf
    • http://poltinik.ru/userfiles/file/kesabesigewuninufitaw.pdf
    • http://al-bandak.com/userfiles/file/nitupevanekewoxomimanif.pdf
    • http://dalaichau.com/files/27768256442.pdf
    • https://soi.icami.mx/ckfinder/userfiles/files/tabuzeze.pdf
    • http://bartuceviri.com/userfiles/file/34594060256.pdf
    • http://tsrmvolontari.it/userfiles/files/18696314062.pdf
    • http://odessawa.com/userfiles/file/rotososogonakegifirevado.pdf
    • https://rubenoferro.com/userfiles/file/mexomiguvevevuluwapu.pdf
    • http://sbcnepal.com/images/file/65230969746.pdf
    • https://rtvpuls.com/ckfinder/userfiles/files/74035121108.pdf
    • http://tlumacz-bialystok.pl/pliki/file/47367373698.pdf
    • http://megalabsrl.it/userfiles/files/97143101699.pdf
    • http://www.prunay-en-yvelines.fr/ckfinder/userfiles/files/17545918016.pdf
    • http://chafewyuok.handysociality.com/upload/files/52258221359.pdf
    • https://chatham-ebenezer.ckdomain.com/uploads/userfiles/files/329494463.pdf
    • http://itcbeautytrainingschool.com/userfiles/file/35277284819.pdf
    • https://costabravas.com/uploads/localidades/files/98569893102.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b1b5.bin
05518fcfd941e23c8a6a299c77ef0b26d928a61d833ebf320519af875f396b6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB1B5 10552 bytes
font_01_sfnt_off0000c9e0.bin
3b25b1b6cfaa7368301362825a2075922a97a21b1e03e30ac2d1cdf06d6ee095		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E0 14312 bytes
font_02_sfnt_off0000edc2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC2 16792 bytes

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