Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6db745e2281c220…

MALICIOUS

PDF

79.7 KB Created: 2021-02-15 07:11:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 755661640299445f47ee7b03b174e503 SHA-1: 523f26acf9a26a865ae58ac47fe9eb821ace77c9 SHA-256: b6db745e2281c220739debce263103b555f745771a90be963cf665536e970559
214 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, with one identified as a malicious redirector. The document body, though heavily obfuscated, suggests a lure related to a 'Ramadan calendar'. The presence of a link farm heuristic further indicates an attempt to distribute malicious content or engage in SEO manipulation for malicious purposes. No scripts were extracted, but the PDF structure and embedded links strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/aws?utm_term=ramadan+calendar+2019+philippines+pdf In PDF document text
    • https://static.s123-cdn-static.com/uploads/4487409/normal_5ffebe39bfe84.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424024/normal_5ffcf125bef37.pdfIn PDF document text
    • https://pulezigo.weebly.com/uploads/1/3/4/6/134600697/gizixusovaxe_wifegedupufij_bixumulixilu_mevewuzile.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501995/normal_5fdb267158d49.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482023/normal_5fcb1db1d11e5.pdfIn PDF document text
    • https://cdn.sqhk.co/tororukiwuri/3Ee1W3b/bepozigewunu.pdfIn PDF document text
    • https://cdn.sqhk.co/fawabanof/gcG4mgc/duwaxupazef.pdfIn PDF document text
    • https://dagazafija.weebly.com/uploads/1/3/1/4/131484603/8559258.pdfIn PDF document text
    • https://tapukinag.weebly.com/uploads/1/3/1/6/131606864/4298111.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484812/normal_5ff65db1f3294.pdfIn PDF document text
    • https://cdn.sqhk.co/wanevakaxuma/iiVigia/the_battle_cats_game_guide.pdfIn PDF document text
    • https://latoratepowubum.weebly.com/uploads/1/3/4/7/134713938/kubani-takefozafuk-nutusa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446019/normal_600bb9d4912ca.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/nuruvapozixix/23701778578.pdfIn PDF document text
    • https://s3.amazonaws.com/sagotomagin/felicidade_roubada_augusto_cury.pdfIn PDF document text
    • https://s3.amazonaws.com/dovulavavo/puravaliputitexamited.pdfIn PDF document text
    • https://s3.amazonaws.com/kugelilizibuwum/55935047098.pdfIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/coppelia_mazurka_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/jirebonudur/43457227186.pdfIn PDF document text
    • https://s3.amazonaws.com/wunupalezozerud/ravaxojeb.pdfIn PDF document text
    • https://s3.amazonaws.com/kavugusepe/performance_budget_management_definition.pdfIn PDF document text
    • https://s3.amazonaws.com/bokelur/bts_guidelines_for_acute_hypercapnic_respiratory_failure.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE203 5884 bytes
SHA-256: 5d21afebcaba6b5d07794c6d53a95a63bc19b0700705764f112b780c58e97e21
font_01_sfnt_off0000f5e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E1 10684 bytes
SHA-256: c3f8f8ca6cc7bfc4069d62a65f48177580d18c949b6bd347654cb1e57782e026
font_02_sfnt_off00011a37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A37 16436 bytes
SHA-256: 0c1b4308e639e6082c36cbdd5983ff4eb36ffeea6a1e0adbb8fffd738b1ea7b0