Malicious PDF — malware analysis report

Static analysis result for SHA-256 246bf5abee1c3bca…

MALICIOUS

PDF

78.2 KB Created: 2021-04-01 01:22:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2725fbc5358685dfd6c15296dde804dc SHA-1: 75f1370898fb21c12a42d41564d5a8c5c9e01afa SHA-256: 246bf5abee1c3bcaadf78b61a9eba8dcea55b4cbd6426a38e0d5c95337915f08
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains an external URI pointing to a suspicious domain, suggesting it's used to redirect users to potentially harmful content. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution attempt, likely leveraging a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://jacksth.ru/wix?keyword=fluid+mosaic+model+worksheet+pdf
    • http://ninomut.sportsontheweb.net/most_powerful_positive_words.pdf
    • http://najelipopusivut.getenjoyment.net/vevole.pdf
    • http://tenopokas.22web.org/59393644263.pdf
    • http://rixuliketasaban.mywebcommunity.org/cancer_de_cuello_uterino_2020_bolivia.pdf
    • http://modezewop.mygamesonline.org/annelida_phylum.pdf
    • http://bikejesoxatelo.mygamesonline.org/chaos_knight_40k_8th_edition_download.pdf
    • http://xevamoz.mygamesonline.org/calligraphy_english_alphabet.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://c039f79f-855f-4b64-8838-30138aeea086.filesusr.com/ugd/6b78cb_984de577a27847339bbb10be9782ea5f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3f9a5314-d634-43b9-9fdd-3a69e3f4c421/love_songs_of_the_90s_r_b.pdf
    • http://podaviloridi.rf.gd/amaravathi_telugu_hd_movie.pdf
    • http://memaded.epizy.com/morgan_and_mikhail_anesthesia_free_download.pdf
    • https://a86b13d2-a9ad-4039-ad74-10d2f7332aba.filesusr.com/ugd/6e2451_9561f6acd95d4942802c62a5bfa695f8.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2b9051ad-b284-42ce-aa6a-b21f24743fc5/what_types_of_intermolecular_forces_are_present_in_dimethyl_ether.pdf
    • http://wixukitasezi.epizy.com/grace_under_pressure_call_of_cthulhu.pdf
    • http://wudafozejuniv.rf.gd/53250077745.pdf
    • https://uploads.strikinglycdn.com/files/01fc643f-ee38-457a-a7d4-5e1c67b0086d/begozasejinefofetewu.pdf
    • https://uploads.strikinglycdn.com/files/1c3ba2ca-b75d-4914-96fc-b9c611c5fe00/68920230207.pdf
    • https://e29f0852-aa8c-4fc4-a5db-fcd144ab7086.filesusr.com/ugd/b730be_b65582b4944e44e192d7ccd0e3cbff5d.pdf?index=true
    • https://ff9dba89-6132-4485-99c2-ace8a2453124.filesusr.com/ugd/c3f59f_fb80c8396d1c47d6a46b3fcd4e64eee9.pdf?index=true
    • http://xuwanuxetoto.rf.gd/receipt_template_south_africa.pdf
    • http://kinutumuzikuji.epizy.com/nadaz.pdf
    • http://vegiroromofi.rf.gd/xeropagakadomap.pdf
    • http://bumurulepowele.myartsonline.com/german_dictionary_file_download.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_off0000f4f9.bin
294fa933656c5fbbc025b016bbb68749388002b0368fd2075797659dba755fe9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F9 5508 bytes
font_01_sfnt_off0001079d.bin
db92793f60ac5b116d3b8035528c75893d5f17536b96f1db6186305cefcfaaa3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1079D 10556 bytes

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