Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff5e71cb8108f32a…

MALICIOUS

PDF

73.2 KB Created: 2021-03-20 20:44:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef95fbd32f72220716164ff4e8081aae SHA-1: c22733492da6cee42df58fa64f656da4100a38bf SHA-256: ff5e71cb8108f32ab8aeb5d8c736079223be1295a527b297aeb7eef76cfbcca1
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection, indicating malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, appears to be a lure related to humidifier instructions, designed to trick users into visiting the malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jottigo.ru/strik?utm_term=crane+droplet+ultrasonic+cool+mist+humidifier+instructions
    • https://feposogasutam.weebly.com/uploads/1/3/1/3/131384530/takafowipikuga.pdf
    • http://kabejorudedofom.22web.org/i_c_d_s_ka_full_form.pdf
    • https://cdn.sqhk.co/terasovo/HI0Ahd0/43369669639.pdf
    • http://ig-copyrightnoticehelp.com/brandywine_falls_tubingp3uqx.pdf
    • https://lokanasa.weebly.com/uploads/1/3/5/2/135299929/metuwot.pdf
    • https://cdn.sqhk.co/xonipavu/lRjgijo/free_birthday_collage_maker_online_for_facebook.pdf
    • https://cdn.sqhk.co/kubepugemaki/ghjhjjh/mubobiroxaf.pdf
    • https://rosanibo.weebly.com/uploads/1/3/4/8/134873488/ripetetumesu.pdf
    • https://bepopasexib.weebly.com/uploads/1/3/4/3/134356469/6092038.pdf
    • https://gilepijojuju.weebly.com/uploads/1/3/2/7/132740412/zasevetimow_desufogeduli_xobawogo_goxuzexu.pdf
    • https://cdn.sqhk.co/jutepoxof/VkQjajd/12295015039.pdf
    • http://mamontov-net.cc/222688604451cxvd.pdf
    • http://kitotujebox.22web.org/72218323008.pdf
    • http://future-techno.ru/weber_spirit_300_grill_gratesp4m9m.pdf
    • http://recepty-dd.info/home_depot_bookshelf_pegsc9kg1.pdf
    • https://cdn.sqhk.co/luvunugoz/TO3kIhh/feselelugunulu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nununad.myartsonline.com/bodyweight_exercises_program.pdf
    • http://jujobope.atwebpages.com/derivusodukoxawobun.pdf
    • http://ladesefutajon.rf.gd/heropanti_full_movie_300mb.pdf
    • https://uploads.strikinglycdn.com/files/68fe4898-63ca-4785-afa1-34ca314e223a/zemifapedanonar.pdf
    • https://uploads.strikinglycdn.com/files/5a11e78d-34fa-4607-9a59-187d0cd7bf8f/80071765259.pdf
    • https://uploads.strikinglycdn.com/files/e364802f-f752-490c-a915-42cc9ca7f893/how_to_become_pals_certified.pdf
    • https://uploads.strikinglycdn.com/files/ff00a31f-3e71-426b-85c9-dd5206929c2c/96499765653.pdf
    • https://uploads.strikinglycdn.com/files/ac0310b2-b775-47f5-8e3c-1e692401a505/bapilutawerisajepipa.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd59.bin
bb4ee4e22a6e7720a56eacabb2167774411d7ffcd1e382520c8869feb43913a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD59 5300 bytes
font_01_sfnt_off0000ef33.bin
c606b0ad474132c5688591c7657be3ef6469b4f976e03f8d4044647cb2d5948f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF33 11788 bytes

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