Malicious PDF — malware analysis report

Static analysis result for SHA-256 4da14fb8b1b0e2e8…

MALICIOUS

PDF

75.1 KB Created: 2021-06-08 09:13:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 707a1ba4e90280af1351d9aa7a6aadf9 SHA-1: 571ec3216ac11dbc959b149fea64f691af075361 SHA-256: 4da14fb8b1b0e2e87468ef9d70af3618f5fe9a27ad6f8bf14733164b68e5b007
194 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 ClamAV detection and ML classifier strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution attempt, likely using embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://archism.ru/pbw?utm_term=minecraft+1.14+free+download+java+edition PDF link annotation
    • https://maxanijalezo.weebly.com/uploads/1/3/2/3/132303118/lozurokibibobojuzeto.pdfIn PDF document text
    • https://sirofutalaga.weebly.com/uploads/1/3/4/7/134706343/zobusorojo_pivibarureve_lubigaxiworani.pdfIn PDF document text
    • https://zejafopo.weebly.com/uploads/1/3/4/5/134505046/8268520.pdfIn PDF document text
    • https://narofuputukate.weebly.com/uploads/1/3/4/5/134585455/bulepomumeviz.pdfIn PDF document text
    • https://mirovufi.weebly.com/uploads/1/3/5/9/135958785/2143a584.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kejuziz.pbworks.com/f/birth_certificate_template_google_docs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac667aee-dba0-41ae-a1a4-90e3473736bd/64173035895.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a871307-3b85-45a2-abb8-ecb4976de567/ways_to_listen_to_music_offline_on_iphone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b70c586-5106-4d01-88b9-e356d640735c/how_to_load_bobbin_in_brother_sewing_machine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7241cb93-0ec0-404e-9852-d6243b5da683/41707349163.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe11857f-a971-491b-a96f-5083f6734ac1/download_true_skate_mod_unlimited_money_free_on_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4635fe3f-a960-4679-8b57-c07a78eb0228/meroponetumalexedejid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55fce98c-ecd1-478c-a874-a3572be8820b/dell_latitude_e7450_screen_price_in_india.pdfIn PDF document text
    • http://fudejob.pbworks.com/w/file/fetch/144600219/bosudakapu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32fa40a0-8695-4dbd-a2e1-0a330187ac95/80375284461.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4be65222-18db-4ab7-a53d-727f81616d07/estilo_de_vida_concepto_oms.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c54bf15b-c503-40c9-8573-094604eb2832/how_to_become_a_forensic_medical_examiner.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00d0eff6-151c-4e9c-9326-1c96f8115d24/la_la_land_film_poster.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b491f57b-5a95-441c-901e-77ea9ed72c07/moleguzefok.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_off0000e8b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B8 5244 bytes
SHA-256: 8169ff5a88bcca36bf0a7c77601fe4491cbc29aefae417c390bd21254fbcf88d
font_01_sfnt_off0000fad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD1 10624 bytes
SHA-256: bb34e1a41f3cb2c23524a2c363915a565a71dd21790890082b497c893779246d