Malicious PDF — malware analysis report

Static analysis result for SHA-256 99798fde6e5b9aef…

MALICIOUS

PDF

73.8 KB Created: 2021-03-27 18:04:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: e4534c6ac19ec4ceeaafd51cb65fec16 SHA-1: fd05170961640c21d428d8c4288bc5104ad81a6e SHA-256: 99798fde6e5b9aefb73411bfab3da5207fb35d66a0e4412f44846e7b9523478f
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lozipotod.ru/123?utm_term=best+games+for+free+android PDF link annotation
    • http://tlgfree.xyz/false_god_crossword_nexusk59du.pdfIn PDF document text
    • http://gejokakop.mygamesonline.org/zodasogobakob.pdfIn PDF document text
    • http://albatros-trans.ru/information_technology_for_managers_george_reynolds1pr5y.pdfIn PDF document text
    • https://cdn.sqhk.co/nogorodizet/jfaSIjd/black_friday_laptop_deals_2020_under_500.pdfIn PDF document text
    • https://rokumewa.weebly.com/uploads/1/3/4/5/134529377/eda7d01f3e38.pdfIn PDF document text
    • https://cdn.sqhk.co/wupifufexix/tjcgifR/62310982486.pdfIn PDF document text
    • http://crawlmqyu.space/to_have_or_to_be_erich_frommvvv9f.pdfIn PDF document text
    • https://cdn.sqhk.co/vakenuda/aRmbPii/grand_battle_royale_pixel_fps_para_pc.pdfIn PDF document text
    • http://dorutote.scienceontheweb.net/zegokidedudunezanumor.pdfIn PDF document text
    • https://zokilare.weebly.com/uploads/1/3/4/7/134767859/3865515.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480893/normal_60462a38c16f9.pdfIn PDF document text
    • https://firunonosud.weebly.com/uploads/1/3/6/0/136052948/2172388.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446496/normal_604cbfb308a88.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421210/normal_60325a6f2880f.pdfIn PDF document text
    • http://pemotutafid.mywebcommunity.org/hair_clippers_for_dogs_amazon.pdfIn PDF document text
    • https://cdn.sqhk.co/tibakekavero/iqFGidm/danadolin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421940/normal_60132b666d66a.pdfIn PDF document text
    • https://cdn.sqhk.co/zoluxoni/icgc2Km/84023955195.pdfIn PDF document text
    • https://cdn.sqhk.co/pefisemise/W4hhjer/mad_zombies_offline_zombie_games_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/resozasevej/aXEgiif/warframe_crossplay_news.pdfIn PDF document text
    • https://cdn.sqhk.co/wepigosogo/ic52jfx/mastercraft_2020_new_crafting_e_building.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://putunoxixowelo.atwebpages.com/translate_chinese_to_english_online.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_off0000e4db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DB 5244 bytes
SHA-256: c064bba4811f81b25099005ec77f797f44d997c206af553bab6e6671c7d292d5
font_01_sfnt_off0000f69f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69F 10440 bytes
SHA-256: a5d0112c01db4a68d2bfbf751e0fbbca61f6c2dc314e6d0f28542bc7f5fc6acd

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