Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7500dce38d3e158…

MALICIOUS

PDF

68.6 KB Created: 2021-09-13 02:21:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4dcc1b269feb7d7377a31f6d5018d77e SHA-1: bf6a5b3fa52117320dce749807a066705c46bdc3 SHA-256: d7500dce38d3e1582f28280b50f457a500b467149b391589bc95f257dc9efbb1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs pointing to external sites, many of which are structured as link farms, suggesting an attempt to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://erbamedica.org/userfiles/files/fanurig.pdf
    • http://learnersdigest.org/userfiles/file/liwadozuxetavepepiweku.pdf
    • http://cgl.lu/userfiles/files/safoguludikopipim.pdf
    • http://yasairamenbar.com/uploads/files/jajemowulolivatimotepivij.pdf
    • https://bnbcostaverde.it/userfiles/file/95489330515.pdf
    • http://umbabox.com/userfiles/file/safilamijipikovi.pdf
    • https://trungtammatnamviet.vn/upload/files/66784701355.pdf
    • http://webursitet.org/Files/file/dorisegugujiji.pdf
    • http://stylowa-pss.pl/userfiles/file/laxiwuzuzikex.pdf
    • http://nhuaduongnhapkhauaz.info/upload/files/mujuwagomovotepanofovoj.pdf
    • http://orenprom.com/img/account/file/nufefuvexod.pdf
    • https://pasationtravellers.com/root/FCKeditor/file/xumiwutirinunulu.pdf
    • http://xedaptap.net/userfiles/file/rawikew.pdf
    • http://bjqyms.com/filespath/files/20210908182700.pdf
    • http://dui-antidote.com/images/userfiles/file/8644841507.pdf
    • http://libron.pl/fckupload/assets/file/27064497900.pdf
    • http://brukbet.com/user_images/file/zezevijazizisoda.pdf
    • http://craftland.de/res/wysiwyg/file/3165768352.pdf
    • http://messtores.ca/fck_user_files/file/femakakaf.pdf
    • https://aneri12.eu/res/file/7777243500.pdf
    • http://lovesushiscv.com/uploads/files/jiwugagufitagog.pdf
    • http://mylodge-naoshima.com/images/blog/file/35312570640.pdf
    • https://cmoretv.com/userfiles/fufedagomox.pdf
    • http://zentrumok.com/userfile/files/rexozegojuwavekaparo.pdf
    • https://rowsontw.com/shopadmin/upload/files/petesoxawagibapitujegope.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=block+calls+on+android+lollipop
    • 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_off0000af4e.bin
ab0affb6d97b4906d9128915c933ba6d9e4284daea2cfe33fe18aac1419a7247		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF4E 15084 bytes
font_01_sfnt_off0000d52d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD52D 16792 bytes
font_02_sfnt_off0000ed44.bin
8a718bcd8274daebe418958062bfcc9eb4903d1cdbebfc5519a078a3a3113752		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED44 10424 bytes

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