Malicious PDF — malware analysis report

Static analysis result for SHA-256 c053ed5a367b11f1…

MALICIOUS

PDF

74.3 KB Created: 2021-04-06 22:14:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: d89a99e7613900a37652db3afb5ca06f SHA-1: 1341c3c903eee830de2d2ff57d2f2c62049424ff SHA-256: c053ed5a367b11f10869335e6bfb53e802e3cca385088a2c020e19fd054341ca
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external URIs, with a notable heuristic identifying it as a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body, though heavily obfuscated, contains text related to a TV show, likely serving as a lure.

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://midufefew.ru/123?utm_term=chicago+fire+tv+show+new+episode+guide PDF link annotation
    • http://o-karte-kopilka.com/960614265237y4wp.pdfIn PDF document text
    • https://cdn.sqhk.co/zovaratigu/fjdi5ge/redwood_national_and_state_parks_oregon.pdfIn PDF document text
    • http://mufinofol.scienceontheweb.net/xogevudajavotariwekufin.pdfIn PDF document text
    • http://dejivuxa.mygamesonline.org/cambridge_igcse_business_studies_coursebook_third_edition.pdfIn PDF document text
    • http://wajofima.mywebcommunity.org/xuzalufifadijotadadawarum.pdfIn PDF document text
    • https://cdn.sqhk.co/guwezasov/ngjhb8O/3d_printed_mask_frame_amazon.pdfIn PDF document text
    • http://posadukik.getenjoyment.net/gaggia_classic_pro_2019_review.pdfIn PDF document text
    • http://jojazinex.mygamesonline.org/79363025417.pdfIn PDF document text
    • http://formulamoney.top/61000271413f9kw8.pdfIn PDF document text
    • http://doordash.link/apache_poi_convert_to_excelk3dxq.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/serogajugomiji/saxipobofopamifezowadoko.pdfIn PDF document text
    • https://01477de9-116b-42a6-a62c-54244336611e.filesusr.com/ugd/dea9e9_86d9f2e45e56407baf03fcfd8ef857bd.pdf?index=trueIn PDF document text
    • http://vumamuv.myartsonline.com/airmen_mock_test.pdfIn PDF document text
    • https://s3.amazonaws.com/jexijer/lavifugazegakevutupek.pdfIn PDF document text
    • https://s3.amazonaws.com/dapekufoxiraku/south_movie_in_hd_new.pdfIn PDF document text
    • http://zitadufafasid.onlinewebshop.net/public_relations_manager_salary_uk.pdfIn PDF document text
    • https://03f57db0-fbcf-46ec-8713-21b5992b8512.filesusr.com/ugd/455f95_80fdd5dc484b4956959b3b0cbe709055.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jefobexapulow/biodiversity_and_its_conservation_ppt_free.pdfIn PDF document text
    • https://s3.amazonaws.com/lakadutof/natatubepej.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_off0000e202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE202 5444 bytes
SHA-256: f5d8f1b4e628934a657cc3a0f2f2c5fa77b5a289c7cc489f11768e913dd0a2bd
font_01_sfnt_off0000f49c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49C 10972 bytes
SHA-256: f074b8a9370430b17aaf6e61d80098e294051c7822083f98ee346c1a28fb6a55

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