Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb8cc40668493976…

MALICIOUS

PDF

83.2 KB Created: 2021-09-17 12:36:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 33095bc0f4f5299f467d0fcafaae0ed8 SHA-1: 0a2f8eadb2e6e6b52f68dbf01746e43ec507c191 SHA-256: fb8cc406684939767ba35f8d1b046ed958ac5b429c3f8452a0408118f2f666ad
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. Multiple embedded URLs point to potentially malicious or unknown domains, suggesting an attempt to redirect users to phishing or malware hosting sites. The document body is heavily obfuscated, but the presence of PDF-specific heuristics and embedded URLs strongly suggests a malicious intent to lure users to external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8637

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://timnhanhonline.vn/upload/files/rujuxoxulifivuvubavo.pdf In PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/nemupoluteboruvefagiwogi.pdfIn PDF document text
    • http://jianianhuayule.a9188.com/upload_files/art_files/files/20210902_101855.pdfIn PDF document text
    • http://orthopaede4you.de/userfiles/file/fovaritefexolobodutape.pdfIn PDF document text
    • http://psn-monolit.ru/img_file/files/zixabok.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/gofinepotenojakugulisuj.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/logedozugejekolabovekozo.pdfIn PDF document text
    • http://daiichibus.vn/uploads/news_file/bosodef.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/33374729250.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/73975231451.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/67143538054.pdfIn PDF document text
    • https://pinyardim.com/calisma2/files/uploads/68814075788.pdfIn PDF document text
    • https://marbeyoyun.com/calisma2/files/uploads/zaneneleputofidix.pdfIn PDF document text
    • http://mwcapital.net/ckfinder/userfiles/files/83200707366.pdfIn PDF document text
    • http://makeyourpartnermelt.com/userfiles/file/nokoragaximuvogajolevovas.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/e9054831e89f33b1a5e3196f2326d72e/tuvodesukisoraxuvibuze.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/sugeserotalotupavomilo.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/limemo.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/27672419360.pdfIn PDF document text
    • https://hexema.com/FCKeditor/file/duvozun.pdfIn PDF document text
    • http://airfa.it/userfiles/file/warexipudoboz.pdfIn PDF document text
    • http://ccadl.com/files/20210909142145.pdfIn PDF document text
    • https://kamarkosong.com/contents/files/14395716581.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+to+use+two+facebook+apps+on+androidPDF link annotation
    • 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_off0000ede6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE6 17568 bytes
SHA-256: a95fee3f27f532289d9cca98f4083ebf6f67cff9ecfa86a8c3d9062f6b2b58e0
font_01_sfnt_off00011b0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13321 10976 bytes
SHA-256: 5b43990d0c483c125ca036af535b3db0a6731c1a855619779ffec8a477ddb690

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