Malicious PDF — malware analysis report

Static analysis result for SHA-256 25a4430dec9ef49c…

MALICIOUS

PDF

74.2 KB Created: 2021-02-24 04:51:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f110726962ad6175ec6c9282de56adf4 SHA-1: 39cdad30f53aaa58ff14e04b6f86800fae49a120 SHA-256: 25a4430dec9ef49c8ae9f74410659b4d5197980a4b3a750078a718bbe28de116
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The presence of a redirector URL pointing to a 'winrar password remover tool with crack' and a heuristic for a 'password-protected archive handoff' strongly suggests a phishing or malware delivery scheme. The document likely aims to trick users into downloading a password-protected archive, which is a common tactic to bypass security filters.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jacksth.ru/wix?keyword=winrar+password+remover+tool+with+crack PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4419002/normal_5fefd85575b5b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417141/normal_6000049a407b8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465685/normal_5fee98d4d9b65.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450251/normal_5fd839e3c3023.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369487/normal_600debe1ea48b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380539/normal_5fdc94e9daa34.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444110/normal_5fdd05f3ee71f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370791/normal_602c05a6610fc.pdfIn PDF document text
    • https://cdn.sqhk.co/pogezasamu/s6jdjiy/air_traffic_controller_salary_australia.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409425/normal_600d244fded98.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390069/normal_600f53886d292.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424662/normal_5fd6f7b592589.pdfIn PDF document text
    • https://cdn.sqhk.co/tuxisilogok/ciejfWd/54507529047.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499984/normal_601b1e59445e3.pdfIn PDF document text
    • https://cdn.sqhk.co/xipitufekaru/GjaicxX/parkour_flight_2_apkpure.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455890/normal_5fc78e526f12e.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvonazavo/oPiiVig/volamoseposabokuju.pdfIn PDF document text
    • https://cdn.sqhk.co/murajefovel/jagcgdY/mamelakajulagisawoji.pdfIn PDF document text
    • https://cdn.sqhk.co/xufojidaju/Whfaiax/12462114504.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e64f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64F 5544 bytes
SHA-256: 7c83a973e71f7c8b4e0b9a6e18ee171da12de08804f7cd8b9afe781bf30164df
font_01_sfnt_off0000f912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF912 10052 bytes
SHA-256: ba4baa2fb432f68afb76ef11f02d3e40ab6c28771e0b839b756f56111d868883