Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b01233116c068df…

MALICIOUS

PDF

82.6 KB Created: 2021-03-06 06:41:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 6da4bf3b280b44b1e9ad39c39d545c6b SHA-1: 1f2e658f0478f6203a47b4e8c222c9433f2d67f8 SHA-256: 7b01233116c068df373f79265b505ed0677c7b91a547dc09dff359905613d7be
126 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a link farm, embedding numerous external URLs disguised as content related to a user manual. The primary malicious activity observed is the redirection of users to external sites, likely for SEO manipulation or to serve further malicious content. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://gimoguvi.ru/strik?utm_term=garmin+gps+72+user+manual PDF link annotation
    • http://negedibomul.sportsontheweb.net/farisevemuguwesalubizu.pdfIn PDF document text
    • http://relibafogat.sportsontheweb.net/bissell_proheat_2x_revolution_pet_pro_20666_reviews.pdfIn PDF document text
    • http://basumoxivor.sportsontheweb.net/bagolux.pdfIn PDF document text
    • http://pogibofabut.getenjoyment.net/what_is_the_best_motto.pdfIn PDF document text
    • http://kigumelez.medianewsonline.com/generate_uniform_distribution_in_matlab.pdfIn PDF document text
    • http://winatesef.sportsontheweb.net/machine_learning_engineer_google.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d926c97b-7f3b-4ec8-a52a-318bcb589338.filesusr.com/ugd/120f26_0b43aa2536054cf9b89e637ff4bf2fc6.pdf?index=trueIn PDF document text
    • http://gikunipif.epizy.com/aquaculture_in_telugu.pdfIn PDF document text
    • http://kosuvoz.epizy.com/aerobic_exercise_weight_loss_video_free.pdfIn PDF document text
    • http://zijiwaras.onlinewebshop.net/27675582593.pdfIn PDF document text
    • https://387a498e-9551-4239-9507-3183ba214552.filesusr.com/ugd/cd403b_6bdba97c12b74d87bc4754cab8003c00.pdf?index=trueIn PDF document text
    • http://dilutibu.onlinewebshop.net/dir-615_n1_openwrt.pdfIn PDF document text
    • http://zafurug.epizy.com/13489557579.pdfIn PDF document text
    • https://8c285b57-3156-47ce-881b-df665acc117b.filesusr.com/ugd/8d46c2_42a61b5d6b1540418687cae6b5737402.pdf?index=trueIn PDF document text
    • https://e50eee24-2d95-422d-8083-6f618d95927b.filesusr.com/ugd/594ae5_2275771d174d4334948fae9f2a744ffb.pdf?index=trueIn PDF document text
    • http://nupuzawov.onlinewebshop.net/list_of_flowers_in_the_attic_books_in_order.pdfIn PDF document text
    • https://39c1d623-eccb-4af0-a86a-15328a2d61f9.filesusr.com/ugd/3cb6cb_afe90449b80c42018edcd403da6bc743.pdf?index=trueIn PDF document text
    • https://b56e00ce-d729-42e9-814b-b9a4b194f5ba.filesusr.com/ugd/f6f93f_da88c965e30546bab4c78cb1921ec5cf.pdf?index=trueIn PDF document text
    • http://wunekoxewufomaf.epizy.com/zivab.pdfIn PDF document text
    • https://8c4778c4-ed17-4cf1-86f9-5448e21c5c15.filesusr.com/ugd/6da380_c29f2cce1c294799963c923c96b89ee2.pdf?index=trueIn PDF document text
    • https://9a60fab3-6fb0-4be7-9305-b2e3cc44d963.filesusr.com/ugd/811c4f_093bcb3685af4574a0eeb6e691822613.pdf?index=trueIn PDF document text
    • https://46d16763-6c5f-4e19-aa2c-3f4071fcbec2.filesusr.com/ugd/26f730_7fa63696a6a6453680aa437419d5e810.pdf?index=trueIn PDF document text
    • http://lonozixugixapap.epizy.com/28153565594.pdfIn PDF document text
    • http://molopafefo.rf.gd/lekebadukupe.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_off00010521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10521 5380 bytes
SHA-256: 41c214e1151e23c65a0d1c5a3a816a1138a71dcd68c9067d8dd7e3430455a992
font_01_sfnt_off00011761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11761 10968 bytes
SHA-256: 04edfa1c3abfbb44655bc97ed5f5a350e55be644698936ed2b58f38d577dfdf2

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