Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fb79dd7e4b7d293…

MALICIOUS

PDF

81.6 KB Created: 2021-09-10 20:46:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7f1c22e34bc4fb7e30ed59388360e82b SHA-1: 7ae43645185c469029dd4f5bbf7c37c8d95376b1 SHA-256: 2fb79dd7e4b7d2934083127cc177407f395c00fe63e1e514cc0fbf158bce8dbc
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The presence of numerous external URIs, many pointing to PDF files on disposable hosting, suggests a link farm or distribution mechanism for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://cyberbirddog.com/userfiles/files/40578818701.pdf In PDF document text
    • https://ladangmimpi2.com/contents/files/xudopuninetejiguzotowine.pdfIn PDF document text
    • http://dae-young.kr/upload/fckeditor/file/gutoreferogozuvobo.pdfIn PDF document text
    • http://utpcomp.ru/uploads/files/wotuxuzejufazazojovo.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/34774932784.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/74526980639.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/45770579023.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/161370873cc954---febagusibudu.pdfIn PDF document text
    • http://stmarysharipad.com/userfiles/file/87864681034.pdfIn PDF document text
    • http://czechnews.cz/userfiles/files/rofawu.pdfIn PDF document text
    • http://kossuthdigisuli.hu/userfiles/file/99093129988.pdfIn PDF document text
    • https://alley.52886.tw/uploads/files/6978193692.pdfIn PDF document text
    • http://babamoleskine.com/files/file/23477091588.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/magidukoraravilupojemez.pdfIn PDF document text
    • http://veterinariacomportamentale.it/userfiles/files/selekosemexikonazu.pdfIn PDF document text
    • http://jedwines.com/cmsCart/upload/file/potekibu.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/43313362069.pdfIn PDF document text
    • http://textstricker.de/benutzerdateien/10058396188.pdfIn PDF document text
    • https://xn--bankkrtya-41a.hu/js/ckfinder/userfiles/files/20815488964.pdfIn PDF document text
    • http://fractinvest.com/uploads/file/45338987743.pdfIn PDF document text
    • http://ddgasul.com/userfiles/file/galod.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/jarun.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021090615571628802.pdfIn PDF document text
    • http://honghuibio.com/d/files/77904424622.pdfIn PDF document text
    • http://flomojapan.com/upload/files/duwazujagijuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=android+install+app+for+all+usersPDF 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_off0000d8c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C2 10572 bytes
SHA-256: d22b290dc31effcdebbd7f30b5c569e5909a585fd29a1a2de3b5d40bb78e9c53
font_01_sfnt_off0000f101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF101 18576 bytes
SHA-256: d05eecbb7fe114948a4797503b61e2727bdbfca71e3c36a979d5b3c9a8777fd9
font_02_sfnt_off0001207e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1207E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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