Malicious PDF — malware analysis report

Static analysis result for SHA-256 38b1ac1b987efa98…

MALICIOUS

PDF

85.4 KB Created: 2021-09-08 16:24:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: e858ad4f5467d67c0da370d0b2f77dc9 SHA-1: fbfea52dfc0f241c87afb36c3f85d9e77f3c9499 SHA-256: 38b1ac1b987efa98a719f2fff0c107d7739565a7f0b8cc6b1895ca1629390e3e
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and multiple links to external PDFs, many hosted on disposable domains. One high-severity heuristic specifically flagged a link to an algorithmically-generated URL, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • 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.
  • JavaScript action low 1 related finding PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cana.vn/uploads/userfiles/file/fadikimetegunase.pdf In PDF document text
    • https://tasivn.com/upload/ck/files/lelomujabagetiwu.pdfIn PDF document text
    • http://blueyee.com/upload/file/07125514304.pdfIn PDF document text
    • https://ontogepszerviz.hu/editor_up/99204167438.pdfIn PDF document text
    • http://ozona.pt/js/fckeditor/editor/filemanager/connectors/wysiwygfiles/file/36878415187.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/19117572018.pdfIn PDF document text
    • https://strings97.hu/userfiles/file/luzezakifijomuw.pdfIn PDF document text
    • http://przystaneknida.pl/data/aktualnosci_imgs/file/44629492743.pdfIn PDF document text
    • http://zekejozsef.eu/FCKfeltoltott/file/paxatemujoma.pdfIn PDF document text
    • http://surausa.com/uploads/files/tilezukedarumudakuwix.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/4380235329.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6dd2655d6---laduve.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/58469816853.pdfIn PDF document text
    • http://fukaofoods.tw/uploads/files/202109070010551113.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/goravolexiz.pdfIn PDF document text
    • http://oawebserver.com/piceditor/file/61132457488.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/62580639482.pdfIn PDF document text
    • http://ekogamma.pl/javascript/ckfinder/userfiles/files/bebonudumixew.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/zibenamijubulebejevivagaj.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/31553675733.pdfIn PDF document text
    • http://carraracucinecomponibilitrapani.it/userfiles/files/11291827623.pdfIn PDF document text
    • http://jeyadhurgatemple.com/userfiles/file/61566553140.pdfIn PDF document text
    • http://zjbfjt.com/upload/files/89390332753.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/21764998994.pdfIn PDF document text
    • http://www.s4b.nl/upload/files/leseri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=future+continuous+tense+exercises+with+answers+pdfPDF 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_off0000e7fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FB 10936 bytes
SHA-256: 98097ae1cf18e36ee5874972ec5674026ec876f4e4e5b3fda989ebf3bb62fe36
font_01_sfnt_off00010158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10158 18056 bytes
SHA-256: e3cb9c7f09f70da9055d7c9df26f3b8a59e38b64e9060fa68275be84480192bf
font_02_sfnt_off00012fc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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