Malicious PDF — malware analysis report

Static analysis result for SHA-256 16bb466a7c0b270c…

MALICIOUS

PDF

90.4 KB Created: 2021-05-09 02:16:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 7229791b96ec56da36f0e22c0a55c812 SHA-1: 6057162fd42332514ad520f3544ffb67587808e1 SHA-256: 16bb466a7c0b270cf762fce23a1d99c8b02f983554217b2ac33ad009e663a6e8
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 5

  • 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 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://druttle.ru/strik?utm_term=garmin+vivofit+jr+3+band+size PDF link annotation
    • http://xubanapirobula.mypressonline.com/a_flowering_tree.pdfIn PDF document text
    • http://vitodibiwanezej.mypressonline.com/science_careers_list.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488581/normal_5fd6683f45a0e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482869/normal_5ff5241bea45c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387242/normal_5ff580ec31f52.pdfIn PDF document text
    • http://lubenoredeji.mypressonline.com/is_walmart_still_on_covid_hours.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464720/normal_603ba6855f574.pdfIn PDF document text
    • http://sevagawos.getenjoyment.net/foxasefano.pdfIn PDF document text
    • http://lizowaw.scienceontheweb.net/entrepreneurship_development_training.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482860/normal_603bce3077d07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450160/normal_600c9c5a9e828.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385206/normal_5fdb2fbcbcaa7.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/874ec3ae-ecd2-4ec7-806c-1207c1ff6c16/why_doesnt_procreate_show_up_in_app_store.pdfIn PDF document text
    • http://molopafefo.rf.gd/vabelonikotagiwotut.pdfIn PDF document text
    • http://toxezapa.rf.gd/milan_metro_map_2020.pdfIn PDF document text
    • http://moxurux.epizy.com/nokeno.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc1a49c7-a3f7-40da-b50e-f0393bacf5b0/65700270148.pdfIn PDF document text
    • https://s3.amazonaws.com/kiguteperilodu/85829817189.pdfIn PDF document text
    • https://s3.amazonaws.com/pazovugal/avery_labels_template_for_apple_pages.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58e28fea-0f13-494f-a8d8-f80084a31fd9/which_type_of_space_heater_is_safest.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a07788b7-6df5-419b-9774-4d190fd2bd95/calculus_book_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/jewizopukuni/dalutavefane.pdfIn PDF document text
    • https://s3.amazonaws.com/wamatasamegu/nisigagabekedesijaravaz.pdfIn PDF document text
    • http://duzunop.rf.gd/king_of_my_heart_chords_steffany_gretzinger.pdfIn PDF document text
    • https://s3.amazonaws.com/sezebepit/71835663636.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11103 6424 bytes
SHA-256: e637e929042e3978bec96b31b3490ba660419ed310d31d627162007a830036f1
font_01_sfnt_off000120e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E4 5540 bytes
SHA-256: 4c6c880fc0682a8605a00639046bf9492b3ea22d0aaa7a210a9e7cab24d8d42a
font_02_sfnt_off000133bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133BC 11096 bytes
SHA-256: e6cf977f556e2878ad55bf6034157056f39210718e5971e1ae4bc48cfa01e23b