Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1d822360e4dc422…

MALICIOUS

PDF

82.0 KB Created: 2021-09-13 12:45:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 394d15d139aecbdf90e2b2c831cacbc0 SHA-1: 49960444c7f04172f8a11f4a71d2a7007e10b0eb SHA-256: e1d822360e4dc4227c9f5067ba6f1a08f473df860cca1cbbf1cd22090c5afda7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within PDF documents. The presence of numerous external URIs, many pointing to disposable hosting and exhibiting link farm characteristics, strongly suggests a phishing or malware distribution attempt. The ML classifier and ClamAV detection further confirm the malicious nature of the file, likely serving as a dropper for further-stage malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://mimarkamilozkartal.com/userfiles/files/wajafulosum.pdf In PDF document text
    • http://ahlhy.com/uploads/file/060621177358.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/45350143297.pdfIn PDF document text
    • http://infinity-c-t.com/userfiles/file/kivikamiju.pdfIn PDF document text
    • http://joyerialaplaza.com/ckfinder/userfiles/files/zorirerotijifogumafunezox.pdfIn PDF document text
    • http://sdds.be/userfiles/file/31440915067.pdfIn PDF document text
    • https://dgssu.com/upfolder/e/files/20210908205303.pdfIn PDF document text
    • http://intertravel.hu/_user/file/sajamodup.pdfIn PDF document text
    • http://sunnyten.net/userData/board/file/kigakepebalugu.pdfIn PDF document text
    • http://soosanfix.com/upload/fckeditor/file/bojosofewipiresavejediz.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/wekit.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/73665473168.pdfIn PDF document text
    • http://retailcop.ca/files/geteg.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161364ee82e531---43348494120.pdfIn PDF document text
    • http://jingmingtai.com/filespath/files/20210904051628.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/dezawez.pdfIn PDF document text
    • https://hoya.hr/UserFiles/file/ronorikerimuranewapol.pdfIn PDF document text
    • http://relaxzenter.com/uploads/files/27540576578.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/54882171049.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/vasemefumokorek.pdfIn PDF document text
    • https://altaitur.com/ckfinder/userfiles/files/torola.pdfIn PDF document text
    • http://pevak.info/UserFiles/File/36899992242.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=super+mario+64+maker+rom+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_off0000d8a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A5 10888 bytes
SHA-256: 04b4507b3d20e42d6d7d5c8826b7b659a6bbf56700e1eb72db975fb55cc1e8e1
font_01_sfnt_off0000f1d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D8 18660 bytes
SHA-256: 272f16d9ec3ad6274c79f2fe6aef7fa3cfd9790ff999ffebb3ac17d31482215a
font_02_sfnt_off0001226e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1226E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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