Malicious PDF — malware analysis report

Static analysis result for SHA-256 18aa57f7f3633a86…

MALICIOUS

PDF

71.4 KB Created: 2021-03-17 23:13:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 1c6f8764d76f0cc4ae40bed12a7c5c8e SHA-1: f9b5e683d70bd8749163501bc87f0bed49a00eaf SHA-256: 18aa57f7f3633a86e6a18cb26a01f0a0cf3aabff4f80d02d6d14dfad5db29432
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to disposable domains and redirector infrastructure, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/123?utm_term=volume+of+cone+cylinder+and+sphere+worksheet In PDF document text
    • https://cdn.sqhk.co/sadinuko/iJuT36p/new_action_movies_2020_full_movie_english_hollywood.pdfIn PDF document text
    • http://bukibiroxofin.22web.org/reverse_image_search_facebook_apk.pdfIn PDF document text
    • http://dofoten.22web.org/hp_deskjet_3050_printer_wireless_setup.pdfIn PDF document text
    • http://datingdate.site/30749855441wu76v.pdfIn PDF document text
    • https://cdn.sqhk.co/sozivowemin/ghiishe/43992743779.pdfIn PDF document text
    • http://bottlechainworld.com/dusotavegipibfjfnk.pdfIn PDF document text
    • https://cdn.sqhk.co/setinapas/yJpf2ic/basic_instinct_2_free.pdfIn PDF document text
    • https://cdn.sqhk.co/nelufebo/jfheuwm/kevemikotolef.pdfIn PDF document text
    • http://rovosome.22web.org/vinuzepexuxipilajovop.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a62e46b8-d933-4087-892c-e5439cec6991.filesusr.com/ugd/e9cba9_5c5a1fd3d7044960b7f670c591aa5614.pdf?index=trueIn PDF document text
    • https://15319a82-8c66-4906-b3c2-464277991f2b.filesusr.com/ugd/070acf_b1b5c46be4ad4ae38c2788b36f59d07c.pdf?index=trueIn PDF document text
    • https://3e1af3dc-cf37-4f58-935d-0a6065bc5ce9.filesusr.com/ugd/3ca236_d094cc7ce6db4d629bad3e7f314be603.pdf?index=trueIn PDF document text
    • https://8a7e94d2-1b07-4399-8a7b-cfebf1eb419e.filesusr.com/ugd/e78b77_883865ef103b4ef9bd7f163ed199f593.pdf?index=trueIn PDF document text
    • https://5c126656-fc4f-473b-8c99-11744d2e1b96.filesusr.com/ugd/abd8ec_de4b651de5894f98b89f238d218c8b29.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f28cfb0-b8ba-4cf2-ab6e-1ed27ad6be74/myron_mixon_smoked_brisket_recipe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a15777c5-993e-4246-86cb-acace9a0969d/powetexusogabi.pdfIn PDF document text
    • https://56db2a4d-09ce-4ff6-a558-abb1d6727cd4.filesusr.com/ugd/003b86_f4518d12d37b4d3ab3986c6e738acac4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/11d9a6dd-9a0f-4080-bc23-a73217dff8c8/kenmore_dryer_model_110_repair.pdfIn PDF document text
    • https://e50eee24-2d95-422d-8083-6f618d95927b.filesusr.com/ugd/594ae5_672484e79c9645b896aa70969eb287ea.pdf?index=trueIn PDF document text
    • http://sezeludijufoma.epizy.com/toxude.pdfIn PDF document text
    • https://ac3db616-04cb-40f1-8357-c67041f5e20c.filesusr.com/ugd/eda9ba_5f59b4a76ff647faa47413bccf0eb56e.pdf?index=trueIn PDF document text
    • https://4b3b4da4-1145-40fd-8a04-0ac29766dab0.filesusr.com/ugd/6c6203_42fc054581c0480995968dc825a1c300.pdf?index=trueIn PDF document text
    • http://kirojera.rf.gd/21800839871.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da2f37f7-d917-41ac-90d4-0ffb5cc7d5cd/56328130364.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_off0000da2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2B 5616 bytes
SHA-256: eb87cd8e0bfb38f6e9713289b29acd7db1d901fdb82f201678e6e592e8672d98
font_01_sfnt_off0000ed3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3A 10080 bytes
SHA-256: 55e26eac4e906596688239cfd60da4daa4975ac30894c0786307e09fda2b89c4