Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2e54ad792c12c8a…

MALICIOUS

PDF

85.3 KB Created: 2021-03-27 14:01:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 9e5baa598a8aeed1660fb818b6916db4 SHA-1: e91408a35d6ea5bc5d857734e75291998ba475fd SHA-256: e2e54ad792c12c8a1a257525de469a4749975526bbefc6b9e9ce597d0b7f9e76
156 Risk Score

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 likely part of a link farm designed to manipulate search engine results. The primary URL, 'https://dugedepap.ru/award?keyword=livro+aprender+coreano+pdf', suggests a lure to a site offering a Korean learning PDF, which is likely a pretext for malicious activity. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://dugedepap.ru/award?keyword=livro+aprender+coreano+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4419654/normal_604d4a1aab223.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381551/normal_601bfbe8898ef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488842/normal_5fdea1f9866aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402953/normal_601d07ccc9f80.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477629/normal_5feb692fc8bef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370270/normal_604989d72b1fc.pdfIn PDF document text
    • https://funopazotasar.weebly.com/uploads/1/3/1/0/131070342/gogokusizisox_teparejobijike_bilumax_zotaligew.pdfIn PDF document text
    • https://toxujubew.weebly.com/uploads/1/3/1/4/131437446/b59eeb8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444884/normal_600620436e10c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415934/normal_6041d9e53172e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484355/normal_5ff2d6b55da89.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497372/normal_604aca567aa7c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487416/normal_600fb48950679.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/02eca705-d780-4c28-9520-00fcb01a0feb/warrens_bible_study_methods.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b403252-a1f5-48e6-900a-32839f72e722/sefenirupuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbe1cfb3-0e55-4c75-bde7-59771f670be2/the_girl_from_ipanema_astrud_gilberto_joo_gilberto_and_stan_getz_mp3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a7b73e3-e036-4bd2-a090-c54d851fb884/bruce_lee_quotes_easy_life.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b03cba27-6ef4-42b3-b317-e8d8b57764e6/sonic_menu_prices_2020.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5C 2912 bytes
SHA-256: 1b3332f58311dcec9d87762ce1b2db83ef17784b7ce39670bef50d58fcd59873
font_01_sfnt_off0000f7b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B8 4940 bytes
SHA-256: c73ed4d7e1d1dde443b28ef1e66bc64e0a9ec3838bd0637d7107b0227ff6eb35
font_02_sfnt_off000108a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A8 13428 bytes
SHA-256: 3fdbb822b72a2c86ccc48228091c941d674b6efa34d1cd9b904b0f4fa18a6478
font_03_sfnt_off00013113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13113 16164 bytes
SHA-256: 3afbc95f4a2677bf4c8b77bd7df62e4dbeb651db4b5e482cf97b58e472170d58

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