Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1ede48ffc576b0c…

MALICIOUS

PDF

68.9 KB Created: 2021-09-28 15:56:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0515ba4c054527c0e12716557b481aa9 SHA-1: 82b32b6bb8054c35bce50477af00c4a3f42b93d4 SHA-256: a1ede48ffc576b0c7609f1680085cf54e1617d08e3fade2bf7f2c73db0c6c686
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as an image-only lure, typical for phishing campaigns. It contains numerous external URIs, many of which point to disposable hosting, suggesting a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to a malicious site or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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 1 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://www.fangjin.org/ckfinder/userfiles/files/89338681748.pdf In PDF document text
    • https://xedulichhaiphong.vn/images/news/files/4076811722.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/mujadazuxizil.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/33511929493.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/xewefowagomonogobesite.pdfIn PDF document text
    • https://pernambucoimortal.com/imagens/files/94835906909.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/nozazakinuxijofejadozup.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/luvufizipidolu.pdfIn PDF document text
    • https://akilanews.com/ckfinder/userfiles/files/zafudos.pdfIn PDF document text
    • http://lobi.md/userfiles/file/43072310520.pdfIn PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/55826416308.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/87723088933.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/15961211193.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/73320647846.pdfIn PDF document text
    • https://cosmopolitanhotelbg.com/uploads/wysiwyg/files/65531426652.pdfIn PDF document text
    • http://trungnguyenjsc.vn/uploads/image/files/55604241023.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/viwewofidakamibi.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/xajopefalabumoturuwup.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/11849882102.pdfIn PDF document text
    • http://www.hausman.eu/images/wyswig_images/file/19868046268.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///dosopolofidagana.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/ruwelakakozoruxerovoji.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/waditeru.pdfIn PDF document text
    • https://hlj-vibration.com/uploads/image/20210916/files/20210916222151.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=hairstyles+that+de+emphasize+jawlinePDF 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_off0000ae11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE11 14688 bytes
SHA-256: 75db6f28727c95225f985b75789d7f516fb1689f8863e32705762c5e1f19347b
font_01_sfnt_off0000d313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD313 10916 bytes
SHA-256: f5b31a11b37444219901f4227e06253b9518a6681d8c2a0f019bdfb097986f1a
font_02_sfnt_off0000ec33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1