Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9c287414d509bf7…

MALICIOUS

PDF

86.9 KB Created: 2021-03-30 20:18:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31e100537f06f5cae6db40b7e857aee5 SHA-1: 7e0be3caf66018a746284ea28a68026f309ec3b9 SHA-256: a9c287414d509bf74efe82dbd9655ec7d9832419a01d4a21ffe381a89eb054af
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and point to other PDF files, indicating a link farm for distributing malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/award?keyword=intermediate+accounting+valix+2020+solution+manual+pdf
    • https://wipowoniwosixad.weebly.com/uploads/1/3/0/7/130740259/lonirevujebofij.pdf
    • http://mejegumojotata.22web.org/cervical_cancer_ppt.pdf
    • https://wopuwidutava.weebly.com/uploads/1/3/5/3/135322166/2305461.pdf
    • http://tugeredenazej.mywebcommunity.org/biology_campbell_reece_free_download.pdf
    • https://lozuninusagutog.weebly.com/uploads/1/3/5/3/135309735/jolinalazodav.pdf
    • http://vejawezodasupax.22web.org/baila_samba_conmigo_line_dance.pdf
    • https://xumijarivibamow.weebly.com/uploads/1/3/5/3/135339210/reliwekakeweba.pdf
    • https://vuvugero.weebly.com/uploads/1/3/2/7/132710729/c0f2b80520740.pdf
    • http://pisibebix.22web.org/zusedojekotusi.pdf
    • http://femuvapazurom.iblogger.org/amidah_18_bendiciones.pdf
    • http://migarosovimopem.22web.org/hdonline._to_apk.pdf
    • https://lirodute.weebly.com/uploads/1/3/1/8/131871659/dimexale.pdf
    • http://rixanemusijod.mywebcommunity.org/17043209466.pdf
    • http://fakosujonipej.iblogger.org/fazon.pdf
    • https://zumaboletafu.weebly.com/uploads/1/3/1/4/131454272/5771404.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://maxefaronuxugur.epizy.com/document_to_converter_software_for_pc.pdf
    • http://pamilov.epizy.com/college_graduation_party_invitation_templates.pdf
    • http://gitojaxekeveki.onlinewebshop.net/23545920016.pdf
    • http://luzadewo.epizy.com/think_and_grow_rich_by_napoleon_hill_amazon.pdf
    • http://lufiwivumijej.myartsonline.com/bifilar_suspension.pdf
    • http://panexorumilogim.myartsonline.com/best_oral_b_toothbrush_heads_for_braces.pdf
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011445.bin
adc7e7c27c3cb86025a65621242616cfd5e2bcb30b3dc0304fcc8b926704c431		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11445 5816 bytes
font_01_sfnt_off00012803.bin
e308bb7e903af2f7d0aaa8d2b4a68179408aec27dc4ede1aa56f1aa873785c9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12803 10972 bytes

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