Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8c99e4dddfa8969…

MALICIOUS

PDF

76.6 KB Created: 2021-06-06 13:52:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 9dda561bf71863ce9868b3c03faee6ea SHA-1: fd2fa7af9b207abdfacca1b0f1387b51d2ec44fa SHA-256: e8c99e4dddfa896918c9e0b80621b5cdbc217ecadb793eac1763af6dd8633f47
134 Risk Score

Malware Insights

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

The PDF document contains heuristics indicating it is a link farm and a fake invoice lure. It embeds external URIs, with the primary malicious URL being smidgel.ru. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing or malware hosting sites. No scripts were extracted, but the presence of embedded URLs and the invoice lure points to a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://smidgel.ru/pbw?utm_term=how+to+create+bill+book+in+word PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4444369/normal_601d0510c1c52.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402724/normal_5ff58d17ef3cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475716/normal_605a70f4b7e4b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wikitaxif.pbworks.com/w/file/fetch/144677652/guvedodedubakiwopav.pdfIn PDF document text
    • http://mefijunov.pbworks.com/f/best_mcq_book_for_neet_biology.pdfIn PDF document text
    • http://doxawadar.pbworks.com/w/file/fetch/144495606/rogirefesegegezuze.pdfIn PDF document text
    • http://medodadepud.pbworks.com/w/file/fetch/144646527/vishnu_sahasranamam_gujarati_youtube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22774b50-ec23-4489-882f-bb849eac5d24/85817363756.pdfIn PDF document text
    • http://wijozuzapusa.pbworks.com/w/file/fetch/144686268/nenewudifaxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd714165-396f-4d30-9e8a-261fc32e426e/examples_of_similes_in_the_giver.pdfIn PDF document text
    • http://tisowowuduwe.pbworks.com/f/fafikagovi.pdfIn PDF document text
    • http://paditoxef.pbworks.com/w/file/fetch/144562908/how_do_you_write_a_formal_letter_to_a_manager.pdfIn PDF document text
    • http://ziduzobif.pbworks.com/w/file/fetch/144619104/pokemon_white_2_rom_hack.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f01b9942-de3d-4abf-9582-3c6917460cd2/how_to_solve_isosceles_triangle_proof.pdfIn PDF document text
    • http://rumusapage.pbworks.com/w/file/fetch/144722994/nukolu.pdfIn PDF document text
    • http://ximusutoj.pbworks.com/w/file/fetch/144697416/vygotsky_social_constructivism_theory_reference.pdfIn PDF document text
    • http://ziduzobif.pbworks.com/w/file/fetch/144440916/ganawuxudupaweruje.pdfIn PDF document text
    • http://pebegijopolo.pbworks.com/f/example_of_claims_of_fact.pdfIn PDF document text
    • http://dufogeruzipu.pbworks.com/w/file/fetch/144691695/assertive_communication_examples_sentences.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cf2e728-cfe1-4ac3-8e83-9dc4d8788587/how_to_pair_my_zagg_keyboard_with_ipad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c23367ea-097c-4db3-83d7-d67e46b7c602/vintage_montgomery_ward_riding_mower.pdfIn PDF document text
    • http://fubajulak.pbworks.com/f/bumikeruwiv.pdfIn PDF document text
    • http://pifiloxema.pbworks.com/w/file/fetch/144689490/11818801174.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_off0000edcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCB 5012 bytes
SHA-256: 8f9bc2fa259b4a4ac27f6186485cd92bb3f2b43fbe2497c9e5d03197e69b2843
font_01_sfnt_off0000feef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEF 11252 bytes
SHA-256: 737b3962e52e52db9916ca13b96fe805b6edd58dc925003d84a689bbeb511e4b