Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b8ae70ff54863c2…

MALICIOUS

PDF

73.8 KB Created: 2021-04-03 02:08:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ce03d3aaec00f353ee6335eb4f737a4 SHA-1: e8de15808a85b43a61b0096d4a588ea371a558b8 SHA-256: 4b8ae70ff54863c2436dd2e349058134e4d699f09cb929290cbc1d1c81fcd5f3
96 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ML classifiers and ClamAV. It contains an embedded URI pointing to a suspicious domain, likely intended to redirect the user to a phishing or malware distribution site. The document body is heavily obfuscated, but the presence of external URIs and the overall detection suggest a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=mackie+2404vlz4+case
    • https://cdn.sqhk.co/tezabulaw/rLjdhdS/arcade_games_list_by_year.pdf
    • http://nadipewin.mywebcommunity.org/nisulitab.pdf
    • https://cdn-cms.f-static.net/uploads/4367665/normal_602f5f9caa271.pdf
    • https://cdn.sqhk.co/lexaxemiji/ibgjijb/pamutuludi.pdf
    • https://cdn-cms.f-static.net/uploads/4460463/normal_5fd159dea9387.pdf
    • http://jakesubinosol.scienceontheweb.net/adjectives_with_prepositions_list_in_english.pdf
    • https://cdn.sqhk.co/jabezoxujo/iffI3Kw/dofodimepuxuwudobidemov.pdf
    • https://cdn.sqhk.co/pigalixow/m9hajee/61775465981.pdf
    • https://cdn-cms.f-static.net/uploads/4425009/normal_603f8504a6bbd.pdf
    • http://kodepovorivapi.mygamesonline.org/how_to_use_an_architectural_scale_ruler_1_8.pdf
    • http://tejovotemikodes.getenjoyment.net/analyzing_sentences_an_introduction_to_english_syntax.pdf
    • http://dejivuxa.mygamesonline.org/povabarolomem.pdf
    • http://manapuzasupin.sportsontheweb.net/dementia_journal_articles.pdf
    • https://cdn.sqhk.co/pulovafafita/7jigcig/steam_cleaner_for_porcelain_tile_floors.pdf
    • https://cdn.sqhk.co/kelopifagisu/haijihT/pavubawimasuzunijivijawe.pdf
    • https://static.s123-cdn-static.com/uploads/4369930/normal_5fe3dace2d295.pdf
    • https://cdn-cms.f-static.net/uploads/4457854/normal_5fd5fac375c88.pdf
    • https://cdn.sqhk.co/nadokikado/gggdL2A/buvukofaj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/1d494658-8df1-4002-9a20-1968b33b2587/31114117393.pdf
    • https://uploads.strikinglycdn.com/files/12773375-c886-43ca-9915-6cb1247d227d/befazakusegotofilonin.pdf
    • https://uploads.strikinglycdn.com/files/3fa3f0a1-f295-4218-92eb-1f1b6fc86474/tukefujo.pdf
    • https://uploads.strikinglycdn.com/files/bbe0c67d-5e70-40c0-a3e8-45efc9ae6165/63296405910.pdf
    • http://rawegutidum.onlinewebshop.net/calcul_besoin_en_fond_de_roulement.pdf
    • https://uploads.strikinglycdn.com/files/4980cc03-c3bd-4fe2-a9b7-27799e5a19ca/how_to_open_the_top_of_a_maytag_bravos_mct_dryer.pdf
    • http://zonafikepejese.onlinewebshop.net/lipomimonizob.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de83.bin
b1b33223894fcda8c1b1d761852a22623ba428318794b2e14284d02406f71340		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE83 5240 bytes
font_01_sfnt_off0000f08e.bin
778bea67aa10682b32403ef559aa08b502298674d33024006385d2be61601c6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF08E 11816 bytes

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