Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad64c105e2c30f4a…

MALICIOUS

PDF

112.3 KB Created: 2021-03-21 10:42:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 5b4da29b3c0c613199190331c0922d0c SHA-1: ed2228b4a02883214de9d5afaa1b1b3055574dfd SHA-256: ad64c105e2c30f4a5c8c858142cbf5caddce616f19cf95c26d3b0a6d3b452198
186 Risk Score

Malware Insights

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

The sample is identified as malicious by multiple heuristics and an ML classifier, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous external URLs pointing to various PDF documents hosted on different domains. The primary URL, 'https://fokemale.ru/strik?utm_term=dream+interpretation+snake+following+me', suggests a potential phishing lure related to dream interpretation, which is then used to redirect users to other malicious or spam content. No scripts were extracted, but the PDF structure and numerous external links indicate an attempt to lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://fokemale.ru/strik?utm_term=dream+interpretation+snake+following+me PDF link annotation
    • https://cdn.sqhk.co/foroboreb/8nVidhi/jizin.pdfIn PDF document text
    • https://cdn.sqhk.co/lisakopew/d83cUqg/starting_lineup_for_tomorrow_s_race_at_daytona.pdfIn PDF document text
    • http://dosijefa.mypressonline.com/aditya_hrudayam_stotram_in_telugu.pdfIn PDF document text
    • http://tifusavegapawuf.mygamesonline.org/the_bacchae_summary.pdfIn PDF document text
    • https://cdn.sqhk.co/pesuxitum/gjSR65Y/24928980431.pdfIn PDF document text
    • https://cdn.sqhk.co/jedetanepiz/geiighw/memuzitasawa.pdfIn PDF document text
    • http://jedusajinud.mygamesonline.org/bukulesaniwakuwabefuji.pdfIn PDF document text
    • https://cdn.sqhk.co/dusaradezat/Y4jfHQp/jungle_hd_wallpapers_for_mobile.pdfIn PDF document text
    • https://cdn.sqhk.co/kugefaxeker/cighh2F/11910565787.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a121017b-3fb3-450c-9156-48dd71a9bf80.filesusr.com/ugd/07625c_7afbe52fb4a14819a3c4438c2b3bc2f5.pdf?index=trueIn PDF document text
    • https://f766a7e9-a0d0-4e3a-bf7c-946d2e8c2ff4.filesusr.com/ugd/bddb96_2ef0ed918adf443eb54ad9543007a311.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a6e4d31-b30e-40ab-8e85-28ed5cc734f7/manual_de_organizacion_de_funciones_del_ministerio_publico.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47f042ab-4dd2-4aec-946c-6c6beae4a344/89642430712.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b2ae742-b672-4dc6-8727-f081c9d46c91/plantronics_backbeat_fit_3150_in-ear_true_wireless_sport_headphones_black_blue.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f6f541a-0e01-4145-aaea-51ab499a7ee3/the_ontario_highway_traffic_act_book.pdfIn PDF document text
    • http://fomepufasele.atwebpages.com/synonyms_and_antonyms_list_with_urdu_meaning.pdfIn PDF document text
    • https://dce579ed-4708-43c3-aaeb-2c76a6268d78.filesusr.com/ugd/944939_57d668936b964447801e8ec3887eea19.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/63930cd4-0c0b-4d7f-82b1-89bd3242f57b/best_ethiopian_female_names.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9ae60e6-437c-47b6-96c2-8aa2564a2f52/how_to_find_a_rocks_hardness.pdfIn PDF document text
    • https://627f215e-41ba-4aa4-9906-5f9f9d117739.filesusr.com/ugd/8ab72e_073e3ec8236b4598b0de8368fb73cdc3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/df9246df-b9f2-4409-9057-3882cbe13553/what_does_red_globe_mean_on_verizon_router.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_off00017abb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17ABB 5376 bytes
SHA-256: d6fbdc1a9d5430304de7297e70ca4c024df7d7390ffba3dc0296fd86c6236160
font_01_sfnt_off00018d0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D0B 11392 bytes
SHA-256: 1524b3e513e5a55da92b145e14af6ff3f133772c4b8d29f970e4e4c15a227499

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