Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e8e92baf8f5acb8…

MALICIOUS

PDF

72.9 KB Created: 2021-02-23 00:40:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 476efbccb8b704337802a43fc65fac64 SHA-1: 791d704b7122992453fb9409d68e00a1584d2c95 SHA-256: 3e8e92baf8f5acb8c6d0c20d3d0cdc8c54a22d6230535e54e34097033fd16cb2
126 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicates maliciousness. While no scripts were directly extracted, the presence of embedded URLs and the PDF structure itself are indicative of malicious intent, likely to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://druttle.ru/123?utm_term=kenmore+stove+accessories PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4487903/normal_601299e994bbf.pdfIn PDF document text
    • http://konosabidirawu.22web.org/todugejat.pdfIn PDF document text
    • https://cdn.sqhk.co/xatuxazaz/hhe9Put/ghost_town_adventures_mystery_riddles_game.pdfIn PDF document text
    • https://cdn.sqhk.co/woledibiroju/jc0KWU7/heart_application_form_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/mezutorixo/jhfjgja/zombs_royale_hack_2020.pdfIn PDF document text
    • http://gnatural.space/jopasaropelojokakivejubahbp61.pdfIn PDF document text
    • http://energytik.net/jabikawuvodawigovopavrjs8k.pdfIn PDF document text
    • https://tefuvaxijo.weebly.com/uploads/1/3/0/7/130739162/vowukavotilimukis.pdfIn PDF document text
    • https://cdn.sqhk.co/lakivasulis/RhcTcji/pixel_gun_warfare_2_zombie_attack_pacogames.pdfIn PDF document text
    • https://vuvuzuvikedatun.weebly.com/uploads/1/3/4/5/134529562/4145271.pdfIn PDF document text
    • http://tofogabe.iblogger.org/rivovolab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416939/normal_6023ea39a81f8.pdfIn PDF document text
    • https://cdn.sqhk.co/fojufifef/jjhgghd/change_text_color_in_photoshop_cs6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370762/normal_5fe317ad36b65.pdfIn PDF document text
    • https://cdn.sqhk.co/jeporikate/g2Pjihb/lucky_block_addon_download.pdfIn PDF document text
    • http://discovljzg.fun/reloading_supplies_gridley_california41kl9.pdfIn PDF document text
    • http://how2clever.com/xegapipogudumizik650i7.pdfIn PDF document text
    • https://xedagiwaki.weebly.com/uploads/1/3/1/8/131856626/9143590.pdfIn PDF document text
    • https://jibanexoruna.weebly.com/uploads/1/3/5/3/135338247/79c4ba2d0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kazixovo.rf.gd/16654638692.pdfIn PDF document text
    • http://rajemezipuz.rf.gd/porsche_cayenne_gts_manual_transmission.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_off0000e270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE270 4944 bytes
SHA-256: 11c512aa9a00a953474af4e9b8f7627a3605713b15a3961719fcdedc993e144c
font_01_sfnt_off0000f333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF333 10212 bytes
SHA-256: a18d18e06b6dac20097f0c91a4c9b40f51f76e18d6b9a254809597a6bcb2dae2

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