Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c3ffc80c52779b8…

MALICIOUS

PDF

75.5 KB Created: 2021-03-23 09:20:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 07a2e70ef5f7a52de6d5cd2ec8da69e8 SHA-1: 559f3a411e9c9308515775c897aa3e76d3bb5814 SHA-256: 7c3ffc80c52779b8e08f44025c2c1d55f810773ef25a52833c33959c43437c17
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting services, suggesting a link farm designed to distribute malware or phish for information. The embedded URL and the heuristic firings strongly indicate a phishing attempt, likely to trick users into downloading a fake game cheat application. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://soxebez.ru/wix?keyword=clash+royale+unlimited+elixir+apk+download PDF link annotation
    • https://sejelenowoloza.weebly.com/uploads/1/3/4/5/134518320/kofozalebexox-jipek-fuxenogub-mutej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421048/normal_6043f9948b16c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406514/normal_60382a1ec962c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501501/normal_5ff2f1415032d.pdfIn PDF document text
    • http://jafujofefi.iblogger.org/27851916866.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489586/normal_6054ec03d7a69.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489042/normal_602428c7c4c99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449775/normal_604ba3dfe301d.pdfIn PDF document text
    • https://xemegejimeje.weebly.com/uploads/1/3/1/6/131636808/bukapag.pdfIn PDF document text
    • http://jaxaxanukijomel.22web.org/sebemelovinovewoler.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470385/normal_60289fb2b63eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469824/normal_5fda35f769f64.pdfIn PDF document text
    • https://libigidibejaxa.weebly.com/uploads/1/3/3/9/133997225/judotorofifube.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403534/normal_6004950611c5a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/jpegs_opening_in_paint.pdfIn PDF document text
    • https://s3.amazonaws.com/mejawiwomak/5938824087.pdfIn PDF document text
    • http://wunekoxewufomaf.epizy.com/jinigebubatovenom.pdfIn PDF document text
    • http://pokukalaso.rf.gd/free_caller_id_app_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/veraxawewib/numizelebetifapelasimul.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE962 5428 bytes
SHA-256: 763e53ccddca08441aac9d1c6dd519d7a38750c07b4a0a2ef01059528933fe59
font_01_sfnt_off0000fbc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC1 10868 bytes
SHA-256: 0359cdb0696d9d5228220d034dc0cec9c4867237e5ceb564802f22b271a180ba

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