Malicious PDF — malware analysis report

Static analysis result for SHA-256 b633f37f471488e2…

MALICIOUS

PDF

120.2 KB Created: 2021-02-13 21:16:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e81391949b967708aa4dc63ce556e676 SHA-1: 693b1846fb9149ff945bf7c71f14c6ca42c20962 SHA-256: b633f37f471488e2bc5a1b38f97eadff3471551688f762b370a2bddbba5203e9
156 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains a large number of external links, many pointing to S3 buckets, suggesting a link farm or distribution mechanism. One notable URL, 'https://jottigo.ru/123?utm_term=hello+kitty+watch+target', is directly embedded and likely serves as a lure or download source. The PDF structure and embedded content indicate it's designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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.
  • 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://jottigo.ru/123?utm_term=hello+kitty+watch+target PDF link annotation
    • http://nakrutkavk.site/lighthouse_inn_and_suites_pismotn08v.pdfIn PDF document text
    • https://bujubemido.weebly.com/uploads/1/3/0/7/130776032/2274030.pdfIn PDF document text
    • https://devubavoxonor.weebly.com/uploads/1/3/2/7/132741482/60c6c66.pdfIn PDF document text
    • https://mamowolo.weebly.com/uploads/1/3/4/7/134714390/77af25383.pdfIn PDF document text
    • http://mignonette.space/nizifizabaxrb7v7.pdfIn PDF document text
    • http://instapriz24.online/88363009573flsse.pdfIn PDF document text
    • http://strahauto.website/dakevaxetipumalekipoaj1vg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/ropuba/accessories_vocabulary_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/neviwove/3026620567.pdfIn PDF document text
    • https://s3.amazonaws.com/risalenefazozo/deadpool_game_ps4.pdfIn PDF document text
    • http://wedinuvudazoxo.rf.gd/12689022905.pdfIn PDF document text
    • https://s3.amazonaws.com/widiku/22563975259.pdfIn PDF document text
    • https://s3.amazonaws.com/dudurat/ca_foundation_nov_2019_exam_date_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/womirofop/10_envelope_template_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xezujuxoz/system_user_guide_template.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000146c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146C3 14028 bytes
SHA-256: 8eba6832949377c4ee314d2bd132111af2142bc02d08aaebaa22dfd9d6a379f5
font_01_sfnt_off000174e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174E9 4784 bytes
SHA-256: ddf44092596ccc4e1982628b83418b7604f4cab3fbccd51eceeef555760dab2e
font_02_sfnt_off00018554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18554 12464 bytes
SHA-256: ae85fa6e3edb448fcd443177428a031940261f79ebb9f300ef8b0446ac135f65
font_03_sfnt_off0001af85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AF85 16164 bytes
SHA-256: e428de66ceb9deebdb53ebe71febfe16dde38f113f03500bd416f391f33c23f3
font_04_sfnt_off0001c4a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C4A4 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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