Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf584aa51c28ee56…

MALICIOUS

PDF

78.4 KB Created: 2021-04-01 22:41:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 34f1c8d32cf741ed94bb09d96d4257fc SHA-1: 80f60b4c0cfe281370a218174346a08ad4893f22 SHA-256: cf584aa51c28ee56e79527cb0cc3d0ce1cc9bca14e7e663d4e7baa3834a7a0eb
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it's a link farm on disposable hosting. The document body, though heavily obfuscated, contains text related to 'Adjetivos y pronombres demostrativos worksheet', suggesting a lure. Numerous external URLs are embedded, pointing to potentially malicious sites, and the PDF structure itself is flagged for suspicious link farming behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://zajinet.ru/wix?keyword=adjetivos+y+pronombres+demostrativos+worksheet
    • http://zafikapasipugog.medianewsonline.com/53854618893.pdf
    • http://kazimibi.getenjoyment.net/bitomirazavejoju.pdf
    • http://ionatr.space/kusepizavesipaperama34urq.pdf
    • https://xovipapapili.weebly.com/uploads/1/3/0/8/130873893/739149.pdf
    • http://uspehdnyaaxyz.xyz/reset_rinnai_infinity_26nxyex.pdf
    • http://iclod.tech/jorodinasusogobafexbrga.pdf
    • http://xizerunax.scienceontheweb.net/atresia_intestinal_recien_nacidos.pdf
    • http://boriroxoxejava.mypressonline.com/216170793.pdf
    • http://mejegumojotata.22web.org/21494420341.pdf
    • https://cdn-cms.f-static.net/uploads/4417312/normal_5fd5fdc124f65.pdf
    • https://cdn-cms.f-static.net/uploads/4410714/normal_6049ae34a1474.pdf
    • https://dedopaka.weebly.com/uploads/1/3/4/4/134498192/d44ed.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://ranitirunom.myartsonline.com/cell_biology_in_tamil.pdf
    • http://kelujatideligo.epizy.com/microsoft_office_outlook_2007_user_manual.pdf
    • http://vemesivudaro.epizy.com/introduction_to_dslr_photography.pdf
    • http://misukejijixuke.epizy.com/11291932334.pdf
    • http://vobatize.epizy.com/goldman_cardiac_risk_index.pdf
    • http://fobeguwimot.rf.gd/65393110376.pdf
    • http://dufukojoped.rf.gd/xunojemojosufadog.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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df70.bin
629123bfde0685c5f69bbdd27ec008bde0224d5c30af1dabb990f6ee33ea778e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF70 6440 bytes
font_01_sfnt_off0000ef64.bin
dbb3338a653e48655bc82aaa25cab574eb69036f6839ac70b9b02655d17d4d85		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF64 5688 bytes
font_02_sfnt_off000102ae.bin
88cf81d2cac8d9fb96cec282b23f4ce4a5a001baf65bc16ecdd7565c9a74c351		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102AE 11948 bytes

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