Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed9bcd763ae3c186…

MALICIOUS

PDF

67.6 KB Created: 2021-09-25 07:58:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 52998a3c5d731695708bc5214b8df5b1 SHA-1: b5e0b3724a686167005bf5ddc76f4d2ea9d19cb1 SHA-256: ed9bcd763ae3c1866d118bfdd1142378cd7003c2c24b1c678b2973184e14a1c6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it's an image-only PDF designed as a phishing lure. It contains embedded JavaScript and numerous external URIs, suggesting it's part of a campaign to redirect users to malicious sites. The presence of embedded JavaScript points to potential exploitation or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • 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 67 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.
  • 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://medvor.ru/uplcv?utm_term=minecraft+palace+ideas PDF link annotation
    • http://thepducphat.com/upload/files/kalifaropojogoju.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/texefofapefapapoxiwepuve.pdfIn PDF document text
    • https://rtaadmin.mrv-educationservices.com/content_file/files/niloke.pdfIn PDF document text
    • https://ecoquimica.cl/dinamicos/uploads/file/91673622087.pdfIn PDF document text
    • https://luxm.pl/userfiles/file/8136636098.pdfIn PDF document text
    • https://podimercrm.com/img/files/jamufufomokad.pdfIn PDF document text
    • https://xtremefitksa.com/ckfinder/userfiles/files/lukipinesodogojijexewa.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/jimubujigegopowepokali.pdfIn PDF document text
    • https://arerp.kr/data/file///telibepilofevoniw.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/62787075383.pdfIn PDF document text
    • http://teknis.it/userfiles/files/57674671164.pdfIn PDF document text
    • http://villkasz.hu/editor_up/zunixobazipujotifesege.pdfIn PDF document text
    • http://suurelepa.ee/data/file/86158351413.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/58504238001.pdfIn PDF document text
    • https://bfull.ru/uploads/files/fuposafupogifirafetesekor.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/zezovozelarimubatojojak.pdfIn PDF document text
    • http://coumert.com/images/file/64916368537.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/pepelavagotozuxuburixuder.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/66338898339.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16134d5ef8093a---xodofapulolawawiwutiwotu.pdfIn PDF document text
    • http://cloudinfo01.smartevolve.com/images/ckeditor/files/tasikivixiva.pdfIn PDF document text
    • http://nissanotogovap.com/uploads/images/files/buriwonerafutonap.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/koguwabuzepor.pdfIn PDF document text
    • http://flyingfish-stay.com/userfiles/file/lujapidalo.pdfIn PDF document text
    • 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_off0000ae1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c62c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC62C 14048 bytes
SHA-256: b736f16be0ed9ffed72d1b32a2595f0d3dce3da95dae33e1118458b85e482277
font_02_sfnt_off0000e8f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F9 10484 bytes
SHA-256: 5052f4b3ba1ca801ec709bad46b028a5551fbdc29f5a7ea5e1add35f117ca081