Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad564585b1e95d4d…

MALICIOUS

PDF

75.5 KB Created: 2021-04-06 16:05:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: a75ad419118d83ea42455d55f3f50476 SHA-1: 56d339b7c5ea980db756ee2fcb127a27af6d9c17 SHA-256: ad564585b1e95d4d14f35523cc28ad0e0e21997c7b128acb3d8486dfb41dd9fb
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://dafemum.ru/aws?utm_term=el+islam+que+es PDF link annotation
    • http://kowojolajamuv.getenjoyment.net/how_to_use_a_king_in_checkers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485435/normal_603c75bbdf991.pdfIn PDF document text
    • http://sasegotib.medianewsonline.com/accounting_rate_of_return_example_problems.pdfIn PDF document text
    • http://jigiwikab.22web.org/animal_word_search_printable.pdfIn PDF document text
    • http://pugorot.mygamesonline.org/31499225153.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382638/normal_6023844406de9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421768/normal_602b32db92949.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413846/normal_602c35b454247.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482854/normal_6000a000e20f0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/satudifin/frozen_movie_songs_ming.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b73938ed-e81a-4edc-919e-a70323f0abe6/70943910064.pdfIn PDF document text
    • https://s3.amazonaws.com/gezizefefififa/buzirobijizazo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09c2f971-4dd7-4574-b8a2-d66e00df16dd/xovusaje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54328bfe-dc6b-4e87-850a-49f82b6f50e4/gapagalavaradozikejet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a376a1ba-43d6-4766-ac2f-b7327b0447b6/ti_nspire_graphing_calculator_charger.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac41c4c4-64b0-47b7-95db-af40dbe39dc3/how_much_do_you_get_paid_for_medical_research.pdfIn PDF document text
    • https://s3.amazonaws.com/legobegutulo/student_exploration_mineral_identification_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/benuka/pemefij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3e61ddf-9299-4fdf-aa33-050ba4e5215e/what_period_does_pride_and_prejudice_take_place.pdfIn PDF document text
    • http://riledabetime.myartsonline.com/64003043113.pdfIn PDF document text
    • http://tikobonojaxax.epizy.com/password_checkup_chrome_extension_app.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_off0000e9f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F3 4816 bytes
SHA-256: bf39378e081b31a2106312d7dc3956c10a936344d3aafc62033ebf362165f424
font_01_sfnt_off0000fa49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA49 11612 bytes
SHA-256: 6b1e735623015e9d6d5547bb3ddbc17a5d267e43c9b19820ea0b8a37e652e611

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