Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d7416652dd7fa53…

MALICIOUS

PDF

83.4 KB Created: 2021-04-02 23:27:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 54d26959973447ed26a5edb4bcf49088 SHA-1: db10fc968f25582d06eb6c0eda4bf6f5728aa933 SHA-256: 6d7416652dd7fa53f0f9bd022cc666bd0407d911f35389c4a5c8f5d027a3ac12
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic, suggesting an attempt to manipulate search engine results or redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the link farm and the PDF structure suggest it may be used to host or link to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://mezovuduw.ru/wix?keyword=one+hundred+love+sonnets+xvii+spanish
    • http://kdghy.online/59482869329gr1ma.pdf
    • https://pepulumowuso.weebly.com/uploads/1/3/2/6/132681954/begomika.pdf
    • https://rixagaxovexi.weebly.com/uploads/1/3/4/0/134000332/lorixozibixamux-tedixorirum-jivepi-wuvoloz.pdf
    • https://lulegosepo.weebly.com/uploads/1/3/0/9/130969478/ea5483cc1d0f45.pdf
    • http://alania365.ru/67155864444q9x1.pdf
    • https://zedafirulatako.weebly.com/uploads/1/3/4/5/134584693/kobabibonitewinoz.pdf
    • https://nisuwifa.weebly.com/uploads/1/3/1/4/131453943/57252.pdf
    • https://voropulunonuz.weebly.com/uploads/1/3/5/3/135316946/7755051.pdf
    • http://valamivu.22web.org/ejemplo_de_dialogo_escrito_y_oral.pdf
    • https://puxodemidumez.weebly.com/uploads/1/3/5/3/135345879/8129783.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://pibamifa.rf.gd/tasatunemukekixivi.pdf
    • http://sugojokomuto.epizy.com/anticancer_servan_schreiber.pdf
    • http://tufukeg.epizy.com/86453109579.pdf
    • http://fudowoxalukiki.rf.gd/gambar_motif_batik_solo.pdf
    • http://razidekorob.rf.gd/converting_repeating_decimals_to_fractions_worksheets.pdf
    • http://vunivaluxok.rf.gd/gallium_arsenide_laser.pdf
    • http://lusiromipu.epizy.com/fivofawazivutewiw.pdf
    • http://zexolida.rf.gd/story_english_book.pdf
    • http://tosaxope.rf.gd/38487832422.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_off000108ba.bin
c066fa56e8b5f030601719ba74078817df929467518aba67683ce17353f5b2c3
pdf-font-stream PDF embedded font (sfnt) at offset 0x108BA 5200 bytes
font_01_sfnt_off00011a66.bin
420f5d06180a589c78a0aff8612063401aec3ad772409127bb082a8e04451b46
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A66 11552 bytes