Malicious PDF — malware analysis report

Static analysis result for SHA-256 5135a4590a01aefe…

MALICIOUS

PDF

101.3 KB Created: 2021-04-26 01:58:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 2902c99b8e42ee0d9720a9c958ae8fc6 SHA-1: 87d39df76a0147e914897f118db2bb3fd527d237 SHA-256: 5135a4590a01aefed51859e363d605cdc17117963bbdd4e301540807e4ad3b82
126 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are used in a link farm pattern, suggesting an attempt to redirect users to malicious content. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf and a search query, further indicating a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://lozipotod.ru/strik?utm_term=the+witcher+the+last+wish+novel PDF link annotation
    • http://debidarumabef.22web.org/backtrack_5_r3_wifi_hacking_tutorial.pdfIn PDF document text
    • http://citrus-fruit.space/50_shades_of_grey_author_website2gn9m.pdfIn PDF document text
    • http://doorstepcomputers.com/killer_merch_size_guide4cuw6.pdfIn PDF document text
    • http://summer-italy.fun/lojemtcmin.pdfIn PDF document text
    • http://hisgohar.site/sat_practice_test_10_math_calculatorxr1ir.pdfIn PDF document text
    • http://aycotoro7.xyz/xuxevafiponodlawzk.pdfIn PDF document text
    • http://whowill.ru/xibijigavamasifamatilojuinam.pdfIn PDF document text
    • http://minilikaru.iblogger.org/coordinate_grid_worksheets_8th_grade.pdfIn PDF document text
    • http://emmetrix.net/breaking_news_headlines_india_malayalamleyy7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://napusikut.epizy.com/35436120316.pdfIn PDF document text
    • http://raziwisubuza.rf.gd/foods_that_boost_metabolism.pdfIn PDF document text
    • http://xukuzuxim.epizy.com/abbi_jacobson_i_might_regret_this.pdfIn PDF document text
    • https://s3.amazonaws.com/zuvovoxigumuz/koxewofi.pdfIn PDF document text
    • https://s3.amazonaws.com/dufekifaral/how_to_search_quizlet_faster.pdfIn PDF document text
    • http://viwesusogura.rf.gd/tuketenelamawepavo.pdfIn PDF document text
    • http://raraviwikemuliz.epizy.com/3_nephi_17_7.pdfIn PDF document text
    • http://zojifupazavigu.epizy.com/texexu.pdfIn PDF document text
    • https://s3.amazonaws.com/didowugorokirug/golobuwo.pdfIn PDF document text
    • http://sikejilewiz.epizy.com/samsung_s10_android_10_t_mobile.pdfIn PDF document text
    • http://wajodojizofe.epizy.com/languidece_que_significa.pdfIn PDF document text
    • http://vigejufad.rf.gd/gobuwovuzojinogajojax.pdfIn PDF document text
    • http://gitadafip.rf.gd/buratowoxono.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11960 12584 bytes
SHA-256: 289aeb06bf2902d6648d95798d2b1bc525b86a3349b041d83a7ea905c9b39a99
font_01_sfnt_off0001426b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1426B 4988 bytes
SHA-256: d22a39078632790b44b94042bfffb1f525711ee9640f1955f17d6fd94cceb9fe
font_02_sfnt_off00015371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15371 18196 bytes
SHA-256: 86bce5ad470dc53574824746edc6a8b3552d0ef17dd6e3f1df69c823e13eaf52

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