Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6d6b1211975460a…

MALICIOUS

PDF

71.0 KB Created: 2021-02-22 05:17:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 034c5e4b3e5eaf5735900b9a2a67b85a SHA-1: 5dcf923ab9746dff5a28b40414b81c7af4dab12c SHA-256: c6d6b1211975460a2b092b49c433bac1c52a8c07037880ef7c92a6f30d8fe85e
184 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a large number of external links, many of which point to other PDF files hosted on various platforms. This behavior is indicative of a phishing or content-luring scheme, likely designed to distribute further malicious content or lead users to fraudulent websites. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://druttle.ru/123?utm_term=how+big+is+one+acre+compared+to+a+football+field PDF link annotation
    • https://cdn.sqhk.co/diwiporeb/ibhchi0/whatsapp_messenger_free_download_for_desktop_windows_7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385647/normal_5fcf68bf69136.pdfIn PDF document text
    • https://nijusalelazi.weebly.com/uploads/1/3/4/8/134875584/4736278.pdfIn PDF document text
    • https://cdn.sqhk.co/sarafogu/7Cjijse/neon_fidget_spinner_theme_song.pdfIn PDF document text
    • https://cdn.sqhk.co/vipatemeluti/H7Pichd/bugsnax_review_polygon.pdfIn PDF document text
    • https://rizomoxus.weebly.com/uploads/1/3/4/5/134589692/weforuraxusakikewa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499656/normal_5fe1548868e94.pdfIn PDF document text
    • https://rizedugo.weebly.com/uploads/1/3/1/4/131453818/3236697.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417519/normal_601ce34ea18e1.pdfIn PDF document text
    • https://zelivetatop.weebly.com/uploads/1/3/0/8/130814581/junotu.pdfIn PDF document text
    • https://danivuzi.weebly.com/uploads/1/3/2/6/132681213/397b5428a9a.pdfIn PDF document text
    • https://xedasijaw.weebly.com/uploads/1/3/1/4/131453620/duposepunapex_lafifukaxuraba_pipofe_vanarovepese.pdfIn PDF document text
    • https://cdn.sqhk.co/nilulugaj/ge5rie6/51524004158.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/litunux/negolido.pdfIn PDF document text
    • https://s3.amazonaws.com/vetamedisoz/89548438086.pdfIn PDF document text
    • https://s3.amazonaws.com/jowutoneranemuk/delhi_university_3rd_year_date_sheet_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/wujodibu/fifumemu.pdfIn PDF document text
    • https://s3.amazonaws.com/somisilegex/free_office_christmas_party_invitation_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/samopakamefap/free_gameboy_emulator_games_for_android.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d86a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86A 5668 bytes
SHA-256: 6b0f75df9fbe137c6ec85a2f2f31be4f21274cb7324058c1e00f0ffed3fad56e
font_01_sfnt_off0000ebb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB1 10236 bytes
SHA-256: f2bc9b02163d9a244845b99b909aa65efe7181d411429cd8705f925e5afcd897

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