Malicious PDF — malware analysis report

Static analysis result for SHA-256 845843ae2ef8a6f7…

MALICIOUS

PDF

79.2 KB Created: 2021-03-29 16:31:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 95041ea169d4e91fa395428c273f00b2 SHA-1: 2ce951c714aaca818f2f6dec153125a9ed23e839 SHA-256: 845843ae2ef8a6f711ec3fa2f2c518fe977df382e5636d048ca4f9dbd2b55b68
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a primary external URI pointing to 'https://jottigo.ru/strik?utm_term=dell+inspiron+3847+i5-4460%252F8gb%252F1tb'. This URL, combined with the heuristic firing 'PDF_SEO_LINK_FARM' indicating a mass of external links, suggests a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains what appears to be product information, likely a lure to encourage clicks on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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/strik?utm_term=dell+inspiron+3847+i5-4460%252F8gb%252F1tb PDF link annotation
    • https://wixuzezokanozav.weebly.com/uploads/1/3/4/6/134663812/1d51bfc12.pdfIn PDF document text
    • http://kibatol.22web.org/six_easy_pieces_movie.pdfIn PDF document text
    • http://notozil.iblogger.org/jesolubevanut.pdfIn PDF document text
    • http://sibogufurab.medianewsonline.com/materiales_ceramicos_de_construccion.pdfIn PDF document text
    • http://pugisapi.mypressonline.com/past_participle_irregular_verbs_list.pdfIn PDF document text
    • https://jasudelile.weebly.com/uploads/1/3/4/0/134012727/dijire.pdfIn PDF document text
    • http://viteroludobano.mypressonline.com/xasifuxikuvojimuxuge.pdfIn PDF document text
    • https://xewulatejema.weebly.com/uploads/1/3/5/3/135345986/nipesatovudoxo-turado-wozitan.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/divikufifir/zelipibelixojolete.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwosil/body_systems_review.pdfIn PDF document text
    • https://s3.amazonaws.com/mefovu/zowadunutuvewif.pdfIn PDF document text
    • https://s3.amazonaws.com/jefazaxal/is_breath_of_the_wild_the_best_zelda_game.pdfIn PDF document text
    • https://s3.amazonaws.com/wujafivabipo/how_to_get_a_medical_receptionist_job_with_no_experience.pdfIn PDF document text
    • https://s3.amazonaws.com/fedufiporara/vemevopojusivuzurereda.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuzo/zujafodabuji.pdfIn PDF document text
    • https://s3.amazonaws.com/sisaxu/vekapodazoxafovolanij.pdfIn PDF document text
    • http://pabekalu.rf.gd/medekamafami.pdfIn PDF document text
    • http://bemuvubovewe.epizy.com/kolchak_the_night_stalker_theme_sheet_music.pdfIn PDF document text
    • http://tumirukilifu.rf.gd/11464421559.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_off0000eee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE9 5984 bytes
SHA-256: dc8cd94b188aebe10d9b882cd0c549eb0138d0fbd6fbb7d2e7c7a2b8e1df84f8
font_01_sfnt_off0001037d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1037D 14128 bytes
SHA-256: e7805c02aad6a09d9040dbd26d1bf28a5918f164e5242015e687e78396932729

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