Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7ede3d18b1cebb5…

MALICIOUS

PDF

84.9 KB Created: 2021-04-03 10:42:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 8ab43ad294baca7f1977b26ce3f27bb6 SHA-1: 2f386a13178c950aadf19cbca8abcb9fc8ab21a8 SHA-256: e7ede3d18b1cebb599a9c2984d8e945abcfe2cc7aa24ddea60f6dafee6a030e3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics, including a critical PDF link farm detection and ML classification, indicating malicious intent. The document body, though heavily obfuscated, suggests a lure related to a 'zero belly diet book free download'. The presence of numerous external PDF links, many hosted on Weebly, points towards a phishing or spamming operation designed to distribute further malicious content. No scripts were extracted, but the PDF structure itself facilitates the distribution of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://farisogu.weebly.com/uploads/1/3/4/3/134307724/7728705.pdf In PDF document text
    • https://vokefuda.weebly.com/uploads/1/3/4/7/134709273/musonaraxurel_jujogazin_kosujamakevox_lapidi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417830/normal_5ffdee7627264.pdfIn PDF document text
    • http://wgathering.org/hiset_study_guidekwkwd.pdfIn PDF document text
    • https://tugesarafexo.weebly.com/uploads/1/3/5/3/135319839/nerelirinux_josunapagefo_tatarekib_zagezezomupivu.pdfIn PDF document text
    • https://zunepijubu.weebly.com/uploads/1/3/3/9/133986973/tazel.pdfIn PDF document text
    • https://gaxuzuwe.weebly.com/uploads/1/3/1/8/131871814/fofelimomezelinabeba.pdfIn PDF document text
    • https://papafamibupa.weebly.com/uploads/1/3/0/7/130775965/lafip.pdfIn PDF document text
    • https://jipuzalo.weebly.com/uploads/1/3/4/6/134693454/3fa97.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403260/normal_5fe78f40d0533.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450896/normal_5fefeb3297ccb.pdfIn PDF document text
    • https://ruregogawumol.weebly.com/uploads/1/3/2/8/132815787/wemidila-dogisaporesiji.pdfIn PDF document text
    • http://startask.ru/gurilofifedupqrd3a.pdfIn PDF document text
    • http://amorexpo.com/does_microsoft_wireless_mouse_have_batterieswdu7h.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/G1IkLG9TFNM/wb?keyword=zero%20belly%20diet%20book%20free%20downloadPDF link annotation
    • https://s3.amazonaws.com/rizezobabub/91795823634.pdfIn PDF document text
    • https://s3.amazonaws.com/mufukep/chrome_extension_manager_resume.pdfIn PDF document text
    • https://s3.amazonaws.com/ligole/81338769987.pdfIn PDF document text
    • https://s3.amazonaws.com/sisaxu/84745775202.pdfIn PDF document text
    • https://s3.amazonaws.com/voxazedisula/bikavegap.pdfIn PDF document text
    • https://s3.amazonaws.com/pevarijidasalop/94138072488.pdfIn PDF document text
    • https://s3.amazonaws.com/libowebujakux/rascal_ranch_performance_horses.pdfIn PDF document text
    • https://s3.amazonaws.com/jusuberu/girl_from_ipanema_lyrics_amy_winehouse.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10107 4864 bytes
SHA-256: f57fc6b541f2ad186e62c51f2c435b59135c12734bf0140ed10636c02425cabe
font_01_sfnt_off000111b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B4 11136 bytes
SHA-256: 7a1bf2eae2fe1d6a12d28a5c6bc9474b42f46aace0ab9637d067f31d889ad638
font_02_sfnt_off000137b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137B2 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3