Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e03e2e4bf3e9ca1…

MALICIOUS

PDF

89.7 KB Created: 2021-09-10 12:01:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ca8f98b28bed6204552df7a86f1e4cda SHA-1: 049b3b6433903d5d85e0971b79b8c9a9e7a0ace7 SHA-256: 0e03e2e4bf3e9ca1b08a7b83bb0caf5a7168a2c86b0911ba4bfde86641840bc1
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external links, including one to an algorithmically-generated URL, indicating a malicious intent to redirect the user. The ML classifier and ClamAV detection strongly suggest this PDF is a phishing or trojan delivery mechanism. The presence of JavaScript points to T1059.007, and the likely delivery method via attachment suggests T1566.001.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://allytemp.ru/uplcv?utm_term=monster+hunter+portable+3rd+ppsspp PDF link annotation
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/6106a7ca81c708cea4b77f5a53a9c99b/99528638011.pdfIn PDF document text
    • https://nasikampung.info/contents/files/nipavexe.pdfIn PDF document text
    • https://seltec.io/images/uploads/files/xagawopubotusoxax.pdfIn PDF document text
    • http://dakdekkersindex.nl/images/uploads/91684796188.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/88185895516.pdfIn PDF document text
    • https://uat-tunisia.com/userfiles/file/kidebesed.pdfIn PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/53470181095.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132cfc15fc13---nezuviloxexolemiburigolu.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/pozex.pdfIn PDF document text
    • https://hankilfood.com/userfiles/file/20210904034614.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/74047251876.pdfIn PDF document text
    • https://drjou-vc.com/upload/files/76318688908.pdfIn PDF document text
    • http://mariancozma.com/_user/file/23994373794.pdfIn PDF document text
    • http://qlionshousing.ca/userfiles/file/rukepemage.pdfIn PDF document text
    • https://qeyeoptical.com/ckeditor/ckfinder/userfiles/files/didabijexelirovusuzos.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/xumetoxuwijumaxu.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/21554363366.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/bigokiz.pdfIn PDF document text
    • https://sikdercollegeofpharmacy.com/scp/ckfinder/uploads/userfiles/files/52155669576.pdfIn PDF document text
    • http://lizhechem.com/upload/files/nelexixezuvuputerulizuk.pdfIn PDF document text
    • http://veterinarioassociatopacinidallatorre.eu/userfiles/files/mitezexefivolatog.pdfIn PDF document text
    • http://nhadatv.com/webroot/img/files/29005869543.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/jopukijaget.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/pajujiluruf.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///20210906173320_762918564.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/68897267666.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_off0000f136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF136 20788 bytes
SHA-256: 4961ef4ca85ba64413dc9699b45c39da470e325c162214036df30c24691299a1
font_01_sfnt_off00012816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12816 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001402d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1402D 10800 bytes
SHA-256: 9aa99a707923db8d0bb5052c2cc33ca0a08d0ebddea395557a0600158da6cfff

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