Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aaaefdff8e10d94…

MALICIOUS

PDF

75.1 KB Created: 2021-09-21 04:50:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a1704c21b6ec2ef002e7bb0820c89db6 SHA-1: c2b1f2bb2b2b630d64547354e8ffd180beb7c0f5 SHA-256: 5aaaefdff8e10d943a16d53e784ea3f55c5eca7931646317f721b128d8416f9d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The document functions as a link farm, containing numerous embedded URLs that point to various domains, likely intended to lure users to phishing or malware-hosting sites. The presence of external URIs and the 'link farm' heuristic strongly suggest a phishing or redirection attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://www.omt.ntou.edu.tw/ckfinder/userfiles/files/xigepa.pdf In PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/kimukanibotumugibedomod.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/51819861920.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/98059012872.pdfIn PDF document text
    • http://studiocariola.com/userfiles/files/16010736495.pdfIn PDF document text
    • http://autolubitel-irk.ru/userfiles/file/vekefafewitefegituku.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/visakojazak.pdfIn PDF document text
    • http://damnoen.com/ckfinder/pho/files/52776732107.pdfIn PDF document text
    • http://technocom.pl/editor/file/2674941642.pdfIn PDF document text
    • http://wsystem.sk/userfiles/files/ludisirod.pdfIn PDF document text
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/bipisodazasox.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/7189368950.pdfIn PDF document text
    • https://www.highlandernepal.com/assets/ckfinder/userfiles/files/sekizatesizegupedulalode.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/77b73341a2c493c1e283cfba2287f43f/kunopajediwur.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161329cf35da55---kififoxobemub.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/bukulasulinebuneloguva.pdfIn PDF document text
    • http://theprojectmanagement.guru/cote_dor_import/admin/ckfinder/userfiles/files/miwukiwirefubonevi.pdfIn PDF document text
    • http://alfadent-volg.ru/images_uploads/files/zizudopijasakaruli.pdfIn PDF document text
    • http://abwrva.com/uploads/files/biritulijifepumexopup.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/67099328853.pdfIn PDF document text
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/47840927496.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=pubg+lite+update+apk+downloadPDF 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_off0000bebb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEBB 18460 bytes
SHA-256: 2e861f9d1980b970ce80d62c22ceeec53b59f7fc5aea16055a851a1743b99b75
font_01_sfnt_off0000eeb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D0 10716 bytes
SHA-256: 01a33f8302777b87cb8881aa7aa1b3c91626f6713d69ae78d1b6a4a5107ee166

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