Malicious PDF — malware analysis report

Static analysis result for SHA-256 d13680978032c964…

MALICIOUS

PDF

74.8 KB Created: 2021-03-20 11:00:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 702d8fede156839b8330bbc99124bebb SHA-1: 296f4d4deac328e5da20fb10aebd03311e4d0309 SHA-256: d13680978032c964e564179ad5de3a790650dd42228e2f41a1e22ba104dda671
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains or are used in a link farm, suggesting an attempt to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure related to educational worksheets, which is a common tactic for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://botokaw.ru/award?keyword=double+digit+addition+with+regrouping+worksheets+pdf PDF link annotation
    • http://dewisazovuvoxi.mywebcommunity.org/what_is_a_normative_ethical_question.pdfIn PDF document text
    • http://vivujivavo.iblogger.org/arnold_boecklin_font.pdfIn PDF document text
    • http://konalofasu.mywebcommunity.org/minn_kota_terrova_parts_schematic.pdfIn PDF document text
    • http://sanadewa.iblogger.org/onbind_example_android.pdfIn PDF document text
    • http://liwitesuzemumex.sportsontheweb.net/five_dialogues_crito_summary.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9c50f6df-e9c1-453e-a208-eff1cefe231f.filesusr.com/ugd/44b3dc_ca20223a36284ba3a166fd4113fc40df.pdf?index=trueIn PDF document text
    • http://tuzipegubeluwo.epizy.com/35852323034.pdfIn PDF document text
    • https://s3.amazonaws.com/sixolose/the_expanse_books_good.pdfIn PDF document text
    • http://widopux.epizy.com/fetaseguwerez.pdfIn PDF document text
    • http://demoxivefuwuvi.rf.gd/android_app_maker_free_software.pdfIn PDF document text
    • http://xudazefujigi.rf.gd/sum_of_infinite_geometric_series_formula.pdfIn PDF document text
    • https://s3.amazonaws.com/fefurorobumi/34044510670.pdfIn PDF document text
    • https://s3.amazonaws.com/goveruduzewoxu/rusabugukojejulasuwewa.pdfIn PDF document text
    • http://guwaxilajoxeza.onlinewebshop.net/51282142368.pdfIn PDF document text
    • https://59bb578d-b312-442a-858b-1a1a54b18a6c.filesusr.com/ugd/c79b1c_a24bdc8a95fd43b0b652408b7663dc0e.pdf?index=trueIn PDF document text
    • http://kodogama.epizy.com/96642653314.pdfIn PDF document text
    • https://s3.amazonaws.com/gezetega/banners_got_it_in_you_sheet_music.pdfIn PDF document text
    • http://sajavisazoz.epizy.com/arduino_programming_in_24_hours_sams_teach_yourself_download.pdfIn PDF document text
    • https://d525ee04-2a40-494f-8ba9-fee52f7b18ee.filesusr.com/ugd/8b8e24_c26e157f7c37444d87ee014635c6682b.pdf?index=trueIn 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_off0000e688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE688 5600 bytes
SHA-256: 6ad3f7f92829e3808e34b3a436f8c74f7d09dff51efbcecca4832efafaf72911
font_01_sfnt_off0000f99f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99F 10512 bytes
SHA-256: 3de3dc60489fa905c4a00c7a15a3fa5416b8e57b4f5dc39f62dc9a51a4dec1d9

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