Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccf097af323d848a…

MALICIOUS

PDF

73.6 KB Created: 2021-02-22 00:25:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 5d3a8ae2bd7a273ef152800d883e0cbd SHA-1: cfabb1ff7c42b85890393e717c74a0c52ab049fb SHA-256: ccf097af323d848ad0dcac48b716d124f96a8aa9a1cde5e01fb982b1f4002cb8
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many of which are suspicious and likely lead to malicious content or phishing sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically a phishing or trojan distribution campaign. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs suggest an attempt to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://leonvi.ru/123?utm_term=sex+and+the+city+samantha+gets+a+chemical+peel PDF link annotation
    • http://2gusevshop.space/687168326615c5hr.pdfIn PDF document text
    • http://ladyso.ru/dupont_elearning_suite_answers0kyzj.pdfIn PDF document text
    • http://hangookoil.ru/379267399417k3u7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377380/normal_602a2d119bf9c.pdfIn PDF document text
    • http://prazdnikprosto.ru/mukovezasavugojubobebori4oo7x.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446923/normal_5fff40e7eed09.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451954/normal_6005ba4d2c96e.pdfIn PDF document text
    • http://instacopyrighthelpteam.com/asana_app_storejcvrq.pdfIn PDF document text
    • https://kererivodukeje.weebly.com/uploads/1/3/5/3/135303009/5018306.pdfIn PDF document text
    • https://jorikumovitakus.weebly.com/uploads/1/3/4/8/134883246/3727954.pdfIn PDF document text
    • https://worijuxadije.weebly.com/uploads/1/3/4/8/134863955/64dfafeb7f.pdfIn PDF document text
    • http://pelistens.xyz/kingston_coin_op_laundry_edmond_okx0u3y.pdfIn PDF document text
    • http://greatmasters.biz/adjectives_comparison_exercisesdueg3.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/jinotugiwomo/uniformes_colegio_mayor_alferez_real.pdfIn PDF document text
    • https://s3.amazonaws.com/dosalapasenow/cookie_jam_game_app.pdfIn PDF document text
    • https://s3.amazonaws.com/purixifusipelid/dolezixalesovavuvugu.pdfIn PDF document text
    • https://s3.amazonaws.com/gelawiweza/digestive_system_function_in_tamil.pdfIn PDF document text
    • https://s3.amazonaws.com/zoromexemuzid/89415030281.pdfIn PDF document text
    • https://s3.amazonaws.com/lizuseguwix/words_that_start_with_phone.pdfIn PDF document text
    • https://s3.amazonaws.com/tazopaju/gudasutavuzijebawesap.pdfIn PDF document text
    • https://s3.amazonaws.com/sabegokek/39881578910.pdfIn PDF document text
    • https://s3.amazonaws.com/tinajabizoreguf/aala_re_aala_song_simmba.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_off0000e106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE106 5664 bytes
SHA-256: 7c07277a5e8b5757237370c240e6e4df8c86ee7932d99ceaa1f3834d17695141
font_01_sfnt_off0000f437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF437 10832 bytes
SHA-256: dc2eba01a2ac531624c672d5457e00571f30f7efab29735a3045eed91fa4464c

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