Malicious PDF — malware analysis report

Static analysis result for SHA-256 48817fc6f41b88f9…

MALICIOUS

PDF

93.0 KB Created: 2021-10-05 04:08:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8794d5adab50efb9234731b1ed9a005f SHA-1: fe5cf4ccb60c70866da7f2e7e930a40cd10d982e SHA-256: 48817fc6f41b88f91de37ec9d88e39c949e9cc4ffe920b1f0a92e6825c0e790d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML and ClamAV as malicious, with a critical ClamAV detection of 'Pdf.Phishing.Trojan'. The presence of embedded JavaScript and a high number of external links, many pointing to disposable domains, indicates a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting the document is part of a link farm designed to obscure malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://mgs-on-track.com/app/webroot/userfiles/file/96776234219.pdf In PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/52967751497.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/telun.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/21514131151.pdfIn PDF document text
    • http://chenruichem.com/upload/files/92270988413.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/14324276094.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/wubewig.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/77469986119.pdfIn PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/80966052627.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/doses.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/25594391901.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/wejavozotaxudika.pdfIn PDF document text
    • https://www.clinicaepilepsia.cl/ckfinder/userfiles/files/tafisolotesonesuf.pdfIn PDF document text
    • http://fsgzb.com/upfolder/e/files/20210902130807.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/tesaveto.pdfIn PDF document text
    • http://lishasurgical.in/ckeditor/ckfinder/userfiles/files/fopuxupemi.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/vegoxugamuxegexewax.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614faac310ddd---vafepufek.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-09-02/images/files/tulojometureg.pdfIn PDF document text
    • http://margheritango.it/userfiles/file/zakitorowipan.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/22020225744.pdfIn PDF document text
    • https://asiastudy.in/ckfinder/userfiles/files/72187159430.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/weveba.pdfIn PDF document text
    • https://spotiverify.com/ci/userfiles/files/79088908027.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/fewalelogeref.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=right+on+back+to+you+keith+urban+lyricsPDF 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_off00010143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10143 19916 bytes
SHA-256: a5625e719624303199319f7aa0b7294e7a69b38fd678379f2739dcf55cf0ab08
font_01_sfnt_off00013471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13471 11000 bytes
SHA-256: 5be6df6cb44e65b118a8c553f8f96b4171b52ff0cbfe5a6773bb6d05b6a11702
font_02_sfnt_off00014e02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1