Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4d03d4c6a65e1fb…

MALICIOUS

PDF

70.2 KB Created: 2021-05-03 20:03:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f7d0545c99d7f8ba72939ffc92e04cf4 SHA-1: d982ebe3096e76fc87b922c7b3590e6884b1d5ed SHA-256: f4d03d4c6a65e1fb37528a7bc78c367a90b4e09e1d5a07d2eeef2787eda5e360
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 0.9998

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://resalured.ru/strik?utm_term=craftsman+18+inch+42cc+chainsaw PDF link annotation
    • http://givepamodugag.22web.org/administracion_de_empresas_libro.pdfIn PDF document text
    • https://cdn.sqhk.co/madufuxenuw/iygiAbb/nda_example_doc.pdfIn PDF document text
    • https://cdn.sqhk.co/pogezasamu/jjaheib/7840525000.pdfIn PDF document text
    • http://dekiweragaf.mywebcommunity.org/calligraphy_practice_sheets_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/pumafuki/ggicyhb/mr_love_queen_s_choice_lucien_voice_actor.pdfIn PDF document text
    • http://warixedivukinat.mygamesonline.org/ralph_waldo_emerson_death_poems.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/1e00545a-9f8b-4e89-a91c-a5fbcc5b0696/dr_wayne_dyer_i_am_wishes_fulfilled_meditation.pdfIn PDF document text
    • http://zukomakiduw.myartsonline.com/defonixoliparajexo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/276a5cb7-393d-4a3d-ab57-57134a7e5a37/77149196549.pdfIn PDF document text
    • http://kupavojos.epizy.com/vesipad.pdfIn PDF document text
    • http://jetotajasavesi.atwebpages.com/69156650337.pdfIn PDF document text
    • https://s3.amazonaws.com/nitirew/46918316231.pdfIn PDF document text
    • https://s3.amazonaws.com/pezofut/how_to_get_rid_of_acne_pimples_on_forehead.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa2de9b4-5c02-4afb-99b5-ee65063de898/how_to_find_a_person_by_photo_on_instagram.pdfIn PDF document text
    • http://wipojijize.rf.gd/56609194854.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f214d58-89f4-4cd1-8e2c-9c90ad94f56e/how_to_download_cc_on_sims_3_mac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa87502f-4812-4ef5-9176-e17ac47273fd/chocolate_and_cream_dapple_dachshund_puppies.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_off0000d4b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B5 5552 bytes
SHA-256: f7f1ffe918daa8934d726c69684f4251a98f774b606c059cd80f3ce83e60edf6
font_01_sfnt_off0000e78c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78C 10712 bytes
SHA-256: 3a59d801c1f890893a4cb9c7be828447e45ee322f766707ccbd5cdbceb07e714

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