Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b5e3aa22ebbdd79…

MALICIOUS

PDF

75.7 KB Created: 2021-02-28 11:33:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4840c1192675407e8711276a519bde34 SHA-1: f9c5f66de2b267d15d429e8f4fdc0e45e8c98487 SHA-256: 5b5e3aa22ebbdd79ec9ab0f30328ea05a490af4d83e1dbe3bf16eeb5c768351f
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, many pointing to other PDFs, suggesting a link farm or redirection mechanism. One of the embedded URLs, 'https://midufefew.ru/award?keyword=math+worksheets+for+4th+graders+with+answers', is presented as a lure to disguise the malicious nature of the document. The document body, though heavily corrupted, contains fragments suggesting it is related to math worksheets, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://midufefew.ru/award?keyword=math+worksheets+for+4th+graders+with+answers PDF link annotation
    • https://cdn.sqhk.co/wanevakaxuma/iiVigia/the_battle_cats_game_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/bilanogakiw/gisd3hi/100_doors_games_2020_escape_from_school_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/wikaraxixi/IjdWW0J/92773368218.pdfIn PDF document text
    • https://xomitemekebok.weebly.com/uploads/1/3/4/8/134881854/0919030a4e.pdfIn PDF document text
    • https://roguraluvi.weebly.com/uploads/1/3/0/7/130776180/zolibatalifut.pdfIn PDF document text
    • https://xowatugafax.weebly.com/uploads/1/3/4/8/134899368/7671855.pdfIn PDF document text
    • https://cdn.sqhk.co/rajemaramiw/bQ85imV/puppy._io_race_amaze_dog_run_3d_download.pdfIn PDF document text
    • https://cdn.sqhk.co/xubupigegi/cjsrphg/vafuwotabefasorujavo.pdfIn PDF document text
    • https://cdn.sqhk.co/kelifevaz/eeqshgs/monster_race_game.pdfIn PDF document text
    • http://dfahsdfgjsfg.online/increase_image_size_in_paint_netjspqu.pdfIn PDF document text
    • https://cdn.sqhk.co/wukikanas/ib7KCH0/walmart_microban_products.pdfIn PDF document text
    • https://cdn.sqhk.co/vibisimak/jiekgcL/cable_sizing_calculation_formula.pdfIn PDF document text
    • https://xikaxuroloxo.weebly.com/uploads/1/3/1/4/131406092/mazujegux-tuwizoviza.pdfIn PDF document text
    • https://cdn.sqhk.co/bufutoje/hbhdZgr/ben_ten_wallpaper_hd_download.pdfIn PDF document text
    • https://cdn.sqhk.co/zexupibo/gcgepcP/monkfish_liver_recipe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/tobito/tapajosekikubuperemesube.pdfIn PDF document text
    • https://s3.amazonaws.com/lupuvogotog/27549943376.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_off0000ddda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDA 5176 bytes
SHA-256: 33f9bbd6a0f1944ffafe69099d30b66e1ce06ac1ea3f0738c823ef19a0fe37f9
font_01_sfnt_off0000ef8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8C 10392 bytes
SHA-256: a8e1b758808ee486efa4306c820e1aa64a86e1d42febc94736febd4da26055d2
font_02_sfnt_off0001132a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1132A 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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