Malicious PDF — malware analysis report

Static analysis result for SHA-256 804f941c0a3ecc5b…

MALICIOUS

PDF

81.4 KB Created: 2021-09-22 15:44:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 126fc12fe5860cbeea0efca3a2a86823 SHA-1: 3bb3dbb2a806a7ec0d900b28bdbe9aa21897171c SHA-256: 804f941c0a3ecc5b07974d201cae3e21c9a28a42f63e32986a46514d9da8d105
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links on disposable domains, likely to distribute malicious content or phish for credentials. The embedded URLs point to suspicious domains, further supporting the phishing and malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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.
  • 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://wastran.ru/uplcv?utm_term=how+to+save+contacts+from+one+phone+to+another PDF link annotation
    • https://bulendengin.com/upload/ckfinder/files/75333754807.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/93818142963.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/rogir.pdfIn PDF document text
    • http://jayeonrak.com/upfile_editor/2021/files/62430791196.pdfIn PDF document text
    • http://nollve.com/img/editor/image/file/71731485216.pdfIn PDF document text
    • https://hopadive.cz/ckfinder/userfiles/files/vimosiluzujage.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16148ea34c1c11---ronobimolorizufikuw.pdfIn PDF document text
    • http://lagrupacio.cat/file/karadurejomiforasifarojof.pdfIn PDF document text
    • http://greathorserider.com/ckfinder/userfiles/files/30261502.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/60528848115.pdfIn PDF document text
    • http://yuilchem.com/userData/board/file/99626329848.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/guvenogofipituxafe.pdfIn PDF document text
    • http://www.thaitofu.com/image/upload/File/79492070389.pdfIn PDF document text
    • http://sdes.in/uploads/85796381996.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/diveropafujafog.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/nirafo.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/lubogosuliwuza.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/jamomaziragugerirasobe.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/94442934458.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/pojeguvukomiperafezowet.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614016a15a6b8---7363062473.pdfIn PDF document text
    • http://www.ruben.pl/ckfinder/userfiles/files/kovuxoganobiwiweke.pdfIn PDF document text
    • http://goldcoil.com/uploadfiles/files/mirikegafapopad.pdfIn PDF document text
    • http://ideviceplus.be/app/webroot/files/userfiles/files/wezezalukowi.pdfIn PDF document text
    • https://bankubezpieczen.pl/userfiles/file/jawijabepa.pdfIn PDF document text
    • 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_off0000d5dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DC 19000 bytes
SHA-256: b1b5927e82359a7f308912fe0a95fb6b35107b4e5595333349f7da464484f5b4
font_01_sfnt_off000106b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011eca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECA 10748 bytes
SHA-256: 312701e6329b6f79e95082d2e92304bf9b300d9082a34263e4000f98901ff60f