Malicious PDF — malware analysis report

Static analysis result for SHA-256 08b8b5b2ea068e40…

MALICIOUS

PDF

82.3 KB Created: 2021-09-17 12:18:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bec8e344d1b15bb211b62f2c8c29e488 SHA-1: cd1073866caaddc7b552c606c8f3dc04a343f802 SHA-256: 08b8b5b2ea068e40a61e5155fe1cef2e7bd67bebb7eccf1011a4a27fe21c5dbb
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. It contains embedded JavaScript, suggesting it may attempt to execute malicious code or redirect the user. The presence of numerous external URIs, including one flagged as a link farm on disposable hosting, points towards a phishing or malware distribution campaign. The ML classifier's high confidence score further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://tythb.com/uploadfile/files/pigevofurixu.pdf
    • http://rainhouse.kr/data/editor/file/376463623612ff42bea3b3.pdf
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/xotogugulugara.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142225f18937---29403493089.pdf
    • https://infotechb2blite.com/bot/ckfinder/uf/files/kopekopi.pdf
    • http://touristclub.in/userfiles/file/ginov.pdf
    • http://a-xian-coat.com/uploads/files/202109162215238788.pdf
    • http://gibisch.com/files/files/92417986999.pdf
    • https://marcvandewiele.com/userfiles/file/45829095352.pdf
    • https://gulfsupremesa.com/ckfinder/userfiles/files/43518617699.pdf
    • https://sapthagireesyathra.com/userfiles/file/29794023992.pdf
    • http://poongdung.com/FileData/ckfinder/files/20210914_073E8972F01A1867.pdf
    • https://maviet.vn/upload/files/kukiboxudikeleba.pdf
    • http://rmgoals.com/userfiles/files/kituze.pdf
    • https://studioconcept-stand.com/fck_userfiles/file/katili.pdf
    • https://www.highettmetal.com.au/application/third_party/ckfinder/userfiles/files/27926640592.pdf
    • http://mid-europe-ex.com/images/blog/file/jenegemoburijije.pdf
    • http://bayanairag.com/uploads/userfiles/files/bewepomusobiwotikiv.pdf
    • https://simon-daulte.com/ckfinder/userfiles/files/72908355064.pdf
    • https://baongochoa.com/upload/file/28761727150.pdf
    • http://dsfly.com/uploads/files/38237294857.pdf
    • http://achilleferolla.it/userfiles/files/60466472628.pdf
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/14031bbe57aac6c47732a9ab4083c306/36879899987.pdf
    • http://candybeauty.vn/upload/files/xabizubabebirozejegukaf.pdf
    • http://gibisch.info/files/files/bosekugagubakonilazek.pdf
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/96527005092.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=indian+idol+junior+2015+judges
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd97.bin
b8c63b8d8ea15b115fa82843ca834830f537c3c39384e0cc2d2b77eacdddfc89		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD97 10932 bytes
font_01_sfnt_off0000f6dc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DC 16792 bytes
font_02_sfnt_off00010eee.bin
ed632cbb295727c0b20263475ba01b4e5aef9198cb867de3a5c4f84f6be82f8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EEE 17232 bytes

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