Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7440b14f72e6e3b…

MALICIOUS

PDF

75.4 KB Created: 2021-10-07 00:20:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6aab88c6242be207206010b3dc70a185 SHA-1: f006cf69daed61e24ec7562f4ac8597647edf9b4 SHA-256: c7440b14f72e6e3b18b27b8bb96a0a5d139582e4e4447aeb882dda9844de7e69
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, indicating a likely attempt to redirect users to malicious content or phishing pages. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the heuristic findings.

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 https://starfoil-mail.nl/uploads/wysiwyg/65726456593.pdf In PDF document text
    • https://geloracinta.com/contents/files/66766090391.pdfIn PDF document text
    • http://didopack.com/files/sijakalimosenudamubuwol.pdfIn PDF document text
    • http://houselandia.ru/files/tobidagimojojumifimujet.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/e6f70d4fad84043a8f772f0f654e73b2/vovewimijixe.pdfIn PDF document text
    • http://myucpb.net/userfiles/file/dokikenezikomafapuseda.pdfIn PDF document text
    • http://bamor.org/userfiles/file/vorawivis.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/beratobelilumala.pdfIn PDF document text
    • http://araratmebel.ru/img/file/37069375306.pdfIn PDF document text
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/84223071127.pdfIn PDF document text
    • http://rhondachem.com/d/files/14416215829.pdfIn PDF document text
    • http://kkslavicin.cz/sites/default/files/file/tosewozomig.pdfIn PDF document text
    • https://ladachess.ru/userfiles/file/27614056606.pdfIn PDF document text
    • https://bomnuocebara.com/quangbasanpham/app/webroot/upload/image/files/21503790488.pdfIn PDF document text
    • http://climtech.com/files/files/7402050281.pdfIn PDF document text
    • https://pindimana.in/uploads/file/14186710406.pdfIn PDF document text
    • http://nemalipics.com/49976424793.pdfIn PDF document text
    • https://felicityokolo.com/file/98236894737.pdfIn PDF document text
    • http://gcoekmr.org/cukashmir/User_Files/imagefile/44953632761.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/vekobeki.pdfIn PDF document text
    • https://tdemo.order-pro.com/ckfinder/userfiles/files/vosifatotosukugemora.pdfIn PDF document text
    • http://koala-al.com/d/files/fevopufidonefiwufulo.pdfIn PDF document text
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/wodekamibok.pdfIn PDF document text
    • http://spakimthi.com/upload/files/45380958419.pdfIn PDF document text
    • http://signauction.net/userfiles/file/rodoramusotelageb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=si+unit+of+electric+resistance+isPDF 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_off0000beef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEEF 18044 bytes
SHA-256: e768896c603b2ec036e45c1eb2219a1c7d2372c3442c2497ad56e16ec8b4f480
font_01_sfnt_off0000ee76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001068d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068D 10504 bytes
SHA-256: c3c7276e9cbae68b30a65dd2b3a2f21cb38165fa3f06474c70431b3c89bd354a