Malicious PDF — malware analysis report

Static analysis result for SHA-256 528ec516b698b422…

MALICIOUS

PDF

72.9 KB Created: 2021-03-23 00:53:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e942284462cb51ffb5dc7a11183f230e SHA-1: b407e20d56cfd4bfdce30a993deda98b37da7c96 SHA-256: 528ec516b698b422cf49cc2ea909ef89a9e86afc61a81c09057729a2f4a1a333
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://resalured.ru/strik?utm_term=brinkmann+gas+and+charcoal+grill+smoker+attachment
    • https://cdn.sqhk.co/xutazazo/qhfnDzR/face_masks_walmart_reusable.pdf
    • http://thecabinets.xyz/10042347940igq7d.pdf
    • http://mybestchan.online/49322820337ap77g.pdf
    • http://gunofixe.medianewsonline.com/20801900147.pdf
    • http://joweponula.mywebcommunity.org/what_is_starcraft_hd_vinyl.pdf
    • http://bamiluzigu.mygamesonline.org/48572326362.pdf
    • http://mixutadumekaje.mypressonline.com/1335366379.pdf
    • https://cdn.sqhk.co/tumosirewuw/gbQZfPQ/color_questions_for_students_about_social_media.pdf
    • http://zonitupupafof.sportsontheweb.net/aprender_ingles_escuchando_y_repitiendo.pdf
    • http://normaa-id.com/30406851717je9io.pdf
    • https://cdn-cms.f-static.net/uploads/4500183/normal_602ce88ce6ed3.pdf
    • http://pifozuvarivin.22web.org/britain_for_learners_of_english_vk.pdf
    • https://static.s123-cdn-static.com/uploads/4447253/normal_5ff93a952c907.pdf
    • http://lavka-karamel.ru/9298890083d3jsn.pdf
    • http://rm-swis-mine.com/how_to_fix_an_unbalanced_washing_machine_drumgbvmb.pdf
    • https://static.s123-cdn-static.com/uploads/4370540/normal_5fc63a780c276.pdf
    • https://cdn.sqhk.co/kuzetuzame/iTjjjBv/zen_1010_block_puzzle_game_apk.pdf
    • http://dorodirebupekel.iblogger.org/77339101541.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kuxubakelixuzot.atwebpages.com/acgih_2020_portugues_download.pdf
    • http://lugivodunoxasi.atwebpages.com/haryana_current_affairs_2020_in_english.pdf
    • http://kovudefimure.rf.gd/zegenuz.pdf
    • http://vakizonozajaxe.onlinewebshop.net/los_7_puntos_de_la_consulta_anticorrupcin.pdf
    • http://vakogez.myartsonline.com/99355630449.pdf
    • http://wiloradakuno.onlinewebshop.net/logepagirutukuladexotenir.pdf
    • http://bobupugarini.epizy.com/40821911016.pdf
    • http://bobekezugomu.rf.gd/apology_letter_for_mistake.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_off0000dbd6.bin
3d00f88e3d5b2918cd924fee4b450ff01d95714bf68df2ed4afffca73644afea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD6 5468 bytes
font_01_sfnt_off0000ee42.bin
d8af1dd74f2c94cb4c65956f1069470bde592035a4e852b1447c25c670dd0e55		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE42 11136 bytes

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