Malicious PDF — malware analysis report

Static analysis result for SHA-256 38144b4dffb8bc42…

MALICIOUS

PDF

146.6 KB Created: 2021-09-14 04:53:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1dc27446c293c93741b139bd390fb7f7 SHA-1: 6f4e3059642513a0acc31e397b3b4f03b23c2e83 SHA-256: 38144b4dffb8bc42fa46fed175a86e26d61e950e35662007816700841f0c5eb8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, indicating an attempt to execute malicious code upon opening. The presence of numerous external URIs, many pointing to disposable domains and employing UTM parameters, suggests a phishing or malware distribution campaign. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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
  • 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://coretry.ru/uplcv?utm_term=mathematics+for+machine+learning+instructor%27s+manual+pdf PDF link annotation
    • http://jobsandhi.com/uploaded_files/userfiles/files/pujixenobimado.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/73599156772.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/ladenisofulesokumuxa.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/nulenobujusa.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/pomagapopelobebobuva.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613d252754d55---13226489754.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/misupisuniput.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/lukadejupazuluverumexukuf.pdfIn PDF document text
    • https://traicaygiasi.com/Images_upload/files/63043951339.pdfIn PDF document text
    • http://azizavacanze.com/userfiles/files/28342133357.pdfIn PDF document text
    • http://ipllaser.in/uploads/52279292164.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/47637062824.pdfIn PDF document text
    • http://elitsatodorova.com/uploadfiles/file/wafefokuvupuguvun.pdfIn PDF document text
    • https://forumsevens.com/images/file/26011412124.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/1fcbec645c7d2794602271bfaf62e260/woxumufulawa.pdfIn PDF document text
    • http://aliguoriarchitetto.eu/userfiles/files/zekimifipuvu.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/85548052235.pdfIn PDF document text
    • https://kamarkosong.com/contents/files/nowiwudus.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/48025369726.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/kizeka.pdfIn PDF document text
    • http://jamesandsons.ca/userfiles/file/70680567771.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/76777688634.pdfIn PDF document text
    • http://nfc.soo.jp/file/14395522968.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/46069771365.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/42470672796.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_off0001c92e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C92E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001e145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E145 11192 bytes
SHA-256: cb379b0bb624b3816aefcb7a2e16a7c73faa106acfb8d28896bf2089256bbf51
font_02_sfnt_off0001fb17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FB17 25756 bytes
SHA-256: 516970a91dc141d336f3a301b1d3424d5ba928450b4ddf4d2b3bc1fc52c67f76