Malicious PDF — malware analysis report

Static analysis result for SHA-256 630e493735e5aa4a…

MALICIOUS

PDF

77.1 KB Created: 2021-02-22 05:26:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 00de24ff946902e17546a29ae739342b SHA-1: eaab5d6f37003fd36d8f82acc40defb86b27813c SHA-256: 630e493735e5aa4a2a4930582a73aa7799b5be2f9af44fac707ca4d9e75b6619
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic flagging it as a link farm. ClamAV also detected it as Pdf.Phishing.Trojan. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' suggest a phishing or malicious redirection attempt. While no scripts were explicitly extracted, the PDF structure and link farm indicate a likely attempt to lead the user to malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=gravity+falls+bill+cipher+wheel+characters
    • https://cdn.sqhk.co/befulirawid/ge8hhgd/heart_pronunciation_in_american_english.pdf
    • https://cdn.sqhk.co/wodaximewule/Otjfgg2/sesisasipeperosotawojezu.pdf
    • https://cdn-cms.f-static.net/uploads/4466398/normal_6022892ab90a4.pdf
    • https://static.s123-cdn-static.com/uploads/4409420/normal_5ff002a7989ff.pdf
    • https://ferizovewop.weebly.com/uploads/1/3/4/8/134887996/daae20d.pdf
    • https://cdn.sqhk.co/gawagunikuw/c4iijaS/places_to_visit_in_london_travel_guide.pdf
    • https://cdn-cms.f-static.net/uploads/4417025/normal_6032fa7b78ca9.pdf
    • http://antonio-ita.space/taxi_sim_2020_pcobojj.pdf
    • https://misiwutikamiba.weebly.com/uploads/1/3/4/6/134601431/8bb4b56374ab9.pdf
    • https://jaligudupu.weebly.com/uploads/1/3/5/3/135391073/rixamekom-sivabiju-mokikil-xatorux.pdf
    • https://cdn.sqhk.co/wepiwojeta/hhiihb9/guwodoniden.pdf
    • http://musc-media.xyz/barcode_app_for_android_phonejo935.pdf
    • https://static.s123-cdn-static.com/uploads/4415322/normal_5ff237d331d74.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vufupu/a_film_songs.pdf
    • https://s3.amazonaws.com/fibesezati/international_criminal_justice_system.pdf
    • https://s3.amazonaws.com/tonemakopinibem/daros.pdf
    • https://s3.amazonaws.com/nezanurugega/xuretolewamututusapo.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_off0000f116.bin
5810c957906fcdcc62460739e669c187c57a5332ad9c4f9238c601e58b30cbae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF116 5528 bytes
font_01_sfnt_off000103fa.bin
a5a6d4358e3c32add723229b58672f34ae42e004218d010194c16ed943407ddc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103FA 10212 bytes

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