Malicious PDF — malware analysis report

Static analysis result for SHA-256 07efa6189c9ddef0…

MALICIOUS

PDF

79.9 KB Created: 2021-06-11 02:10:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: d0c31b6b4fa5e836fcb1e8ed51db1873 SHA-1: 56db6de1860b313fd2e80ad7fa215c226da95095 SHA-256: 07efa6189c9ddef011fcf2fae113516b8c71598bfd2da7a81b15aa9c01e580cb
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 pointing to disposable hosting services, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to malicious sites. No scripts were extracted, but the PDF structure itself is used to host and present these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://krisoc.ru/pbw?utm_term=toronto+phone+book+2020 PDF link annotation
    • https://tabutepapuwup.weebly.com/uploads/1/3/0/7/130740025/lirozifofe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411714/normal_5fd9a109db5c3.pdfIn PDF document text
    • https://pozemake.weebly.com/uploads/1/3/0/7/130776760/luwusirafewamig_zijexopokufuj.pdfIn PDF document text
    • https://rusulurojexaka.weebly.com/uploads/1/3/0/8/130813489/d4bd6d88.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455639/normal_60601cb3c4dd0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444638/normal_605af413d2856.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452851/normal_6041c9139b462.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409827/normal_6042d07bd4e41.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1b88483-6af6-48c4-8cb5-f81a41fadc6f/best_books_to_read_in_2020_for_success.pdfIn PDF document text
    • http://numefen.pbworks.com/w/file/fetch/144539679/how_much_does_a_internal_auditor_make_in_sa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4f6059e-7217-4544-be93-1399e0dfa6c6/zoluxiderobim.pdfIn PDF document text
    • http://foxubomo.pbworks.com/f/touchstone_3_teachers_book_second_edition_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3544b84e-433a-4c6d-9203-974965d920df/edexcel_ial_chemistry_book_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1a0dc64-b42b-4ae4-bd4d-db9e3b4a1ab6/64941404221.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0648b271-f3eb-4c85-8fa0-b588013f04eb/hp_scanjet_5590_adf_flatbed_scanner_price_in_pakistan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6c13a43-463a-4ba5-ac7e-db69de66e1e2/pebibuvawuzumibalo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8690c4e8-bd7a-4b92-b075-ed6352f07cfa/zodogijupiba.pdfIn PDF document text
    • http://foziwedugumu.pbworks.com/f/discussion_questions_for_the_ransom_of_red_chief.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cd998f7-0281-4d5e-8b32-9db13666f0ea/zurezogu.pdfIn PDF document text
    • http://sonopewobu.pbworks.com/f/grille_salaire_secrtaire_mdicale_2020_fonction_publique_hospitalire.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7294ad3e-e725-4eeb-91ce-d3af63366dda/35638726848.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cee1c952-f34d-4f00-bc95-7c5b332eb06c/40_hadith_al_qudsi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cbd735e-98e5-4eb0-80df-377fe0fb86d5/rajasthan_high_court_ldc_question_paper_23_july_2017.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_off0000fc11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC11 4912 bytes
SHA-256: 65e14551650a63a5613d7de9d3b41750545676ff556f596c4ba7aa18c9021c37
font_01_sfnt_off00010cc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC2 11472 bytes
SHA-256: 5f175d32e41e8234a829a3e46cda677dad8b848ce4335dcadbb6b9a72907148a