Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e8d9f64effe8161…

MALICIOUS

PDF

81.3 KB Created: 2020-12-31 04:02:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d743b7f1986e96149cfac6e469024ce SHA-1: d5cef8a6a7d872e0f5d14494e8aec0b6ea6de735 SHA-256: 3e8d9f64effe8161730be506a83913a3527a4651221f48284b51178a16820107
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 identifying a 'PDF_SEO_LINK_FARM' suggesting a large number of outbound links for SEO manipulation or phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards a phishing or scam campaign designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafftec.ru/strik?utm_term=webtoon+naver+odd+girl+out
    • https://cdn.sqhk.co/ruzewekafan/ifijpgd/71408467568.pdf
    • https://cdn.sqhk.co/pezolaje/cjdpyMG/dragonball_evolution_movie_netflix.pdf
    • https://kepupumi.weebly.com/uploads/1/3/4/6/134616340/badejineloj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gotijejaj/55709448709.pdf
    • https://uploads.strikinglycdn.com/files/d957f7a7-4a60-4295-9515-61b818ce0041/drifting_dragons_netflix.pdf
    • https://s3.amazonaws.com/jobavo/elevator_pitch_about_yourself_template.pdf
    • https://s3.amazonaws.com/dorobukasawituw/cae_speaking_part_1_questions.pdf
    • https://s3.amazonaws.com/fejatepudopito/negedu.pdf
    • https://s3.amazonaws.com/desenaz/duxejegelarunujigawip.pdf
    • https://uploads.strikinglycdn.com/files/da9b90a1-1041-463b-8732-5a800807282b/intro_a_test_sheet.pdf
    • https://uploads.strikinglycdn.com/files/765212ed-360b-40fe-a858-016815c90ede/xixurureliwewef.pdf
    • https://uploads.strikinglycdn.com/files/db9e11f4-f516-4c3a-91f6-90df99045d55/rise_of_berk_runes.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_off0000dbc3.bin
fe775bba8d6ca3068734e93f06588373a7c6dc4be5e94f0113ae0d65bef6a9b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC3 3704 bytes
font_01_sfnt_off0000e92b.bin
a33e9cb25eda64ee9d435acfd649dfa60f9f2949a14a288e923b99112c82a39d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE92B 5028 bytes
font_02_sfnt_off0000fa68.bin
7ef413c072bb8458a0c16924bdcdce831819fb943cd868d3ff02e423730964a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA68 11380 bytes
font_03_sfnt_off00011fa6.bin
fdd420b0af2c9c73807e8f727e2938cec0e827559dfb996c5af8e5cdb95f9fbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA6 16556 bytes

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