Malicious PDF — malware analysis report

Static analysis result for SHA-256 f23dd133d80f96a2…

MALICIOUS

PDF

75.6 KB Created: 2021-03-27 15:30:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c15c7ad32a07c72262fca665bd11f614 SHA-1: 7bab959c506492992b409337fda53f0d8c16fa05 SHA-256: f23dd133d80f96a26fd55ae51cc075a569815385ee7cbdd43ab89f71e23b1dc9
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document exhibits characteristics of a phishing lure, specifically using a 'Wi-fi zone manager' theme to entice users to click on a malicious URL. The presence of a large number of external links, many pointing to PDF files, suggests a link farm or SEO manipulation tactic. The 'ClickFix' heuristic indicates the document may attempt to trick users into executing commands directly, bypassing macro restrictions. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://bologen.ru/wix?keyword=wi-fi+zone+manager
    • https://xekafifem.weebly.com/uploads/1/3/4/6/134669887/7016024.pdf
    • http://milanomodaitaly.site/94798298904xqr1z.pdf
    • https://livaganomin.weebly.com/uploads/1/3/4/3/134399079/gedopamujuma.pdf
    • https://mamufitixiru.weebly.com/uploads/1/3/4/6/134640278/2ee143ab104.pdf
    • http://good-production20.site/baeldung_spring_security_video62q9o.pdf
    • http://sunmarkt.ru/futimepakexekeliwx70pt.pdf
    • https://romugazasemagop.weebly.com/uploads/1/3/4/8/134897733/mupivumog_sulodof_radore.pdf
    • http://prodive.su/how_to_do_division_using_place_value_chart0rdpu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pevuwarobuvowa/pidasejusivebuzupaba.pdf
    • https://47e4df30-8702-49a4-8bd5-327e1546ff06.filesusr.com/ugd/379272_939f33e2c4e9470f9c3544711c21a67e.pdf?index=true
    • https://s3.amazonaws.com/xidazeze/marrs_spelling_bee_registration_form.pdf
    • https://1dab3517-3db0-43ff-9fd6-b65b51f65b60.filesusr.com/ugd/565485_f1d38e25b52e4c3c973b3ca1114233a1.pdf?index=true
    • https://s3.amazonaws.com/tanikanaw/how_to_increase_bmr_for_weight_loss.pdf
    • https://s3.amazonaws.com/gajakelegeza/online_printing_carbonless_forms.pdf
    • https://s3.amazonaws.com/vibasujefir/82837935761.pdf
    • https://s3.amazonaws.com/nelizenejakarug/royal_canin_convalescence_support_feeding_guide.pdf
    • https://s3.amazonaws.com/dazinibonofobi/vopunoxudosot.pdf
    • https://s3.amazonaws.com/gusule/31104831944.pdf
    • https://s3.amazonaws.com/fodose/mr._bechara_full_movie_hd_free.pdf
    • https://s3.amazonaws.com/lezopobigeza/narrative_writing_assignment_4th_grade.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_off0000ea80.bin
688d20ca442180336bd3a8a35a84e9b9f36b41c9c05bfa23a7555306bfed7b1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA80 4972 bytes
font_01_sfnt_off0000fb74.bin
2dd4e3babc37fcc2023cc6168282e316822afcba35cc8aa4658cccade98548ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB74 11244 bytes

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