Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e63d685c10c8a51…

MALICIOUS

PDF

78.7 KB Created: 2021-03-21 02:15:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ba4c49d8f366b256435fd96aeffc98f9 SHA-1: 277974689b0d63f50f13bc713ac277345f6b925d SHA-256: 2e63d685c10c8a51a0df7057d73f803af86a6addbbdbee69d84ee0347cce1bfb
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain that appears to be a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://xezojetit.ru/wix?keyword=compose+and+decompose+fractions+worksheets
    • https://cdn-cms.f-static.net/uploads/4502248/normal_601ae58663984.pdf
    • http://fupopujewobajus.22web.org/business_english_vocabulary_in_use.pdf
    • http://bukibiroxofin.22web.org/how_to_access_menu_on_panasonic_viera_tv_without_remote.pdf
    • https://cdn.sqhk.co/tibatojo/jdWkbhY/swatches_meaning_in_tagalog.pdf
    • https://cdn.sqhk.co/fikalibumi/thjjjja/jefitukizixudikinepopex.pdf
    • https://cdn-cms.f-static.net/uploads/4421613/normal_602be96c593c4.pdf
    • http://xakugitanaz.iblogger.org/uc_browser_free_for_pc_getintopc.pdf
    • https://static.s123-cdn-static.com/uploads/4456121/normal_5ff89c0106446.pdf
    • http://venameripuna.22web.org/autocad_2000_lt_free_download.pdf
    • https://cdn-cms.f-static.net/uploads/4383460/normal_603523f24793b.pdf
    • https://cdn.sqhk.co/zimopaji/exidVYu/53830048827.pdf
    • https://cdn-cms.f-static.net/uploads/4420476/normal_604e48ec95989.pdf
    • https://static.s123-cdn-static.com/uploads/4458394/normal_5ffcda71a688f.pdf
    • http://vogudikomi.getenjoyment.net/a_thousand_years_lyrics.pdf
    • http://waranijovuv.sportsontheweb.net/sakagub.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kalotiwinilobiw.epizy.com/angular_8_reactive_forms_set_value.pdf
    • http://xakexuxav.rf.gd/android_payload_launcher.pdf
    • http://paxugevobudutis.epizy.com/55078077229.pdf
    • http://fokafupu.rf.gd/mepabogivimiruzoxoziwod.pdf
    • http://tatuzukokamowa.rf.gd/93999114512.pdf
    • http://purubonosarule.rf.gd/bupixawuwefotenenuw.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4d5.bin
cc5971e19ac2077f7d377d1b3ff3f1dada38adbcac24fc08ed2d69c64bc6286c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D5 5424 bytes
font_01_sfnt_off0000e723.bin
51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE723 1800 bytes
font_02_sfnt_off0000efb1.bin
011dc830dddecd4ba0c3ff35a5916d752d8b78fb202e4f0c3a41b954014e768d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB1 10908 bytes
font_03_sfnt_off0001156a.bin
39b2f4b99ee08965fd4836f89f628a00cde8346cb181131bba0308e80db8fb67		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1156A 16092 bytes

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