Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0caaacf321fd1e0…

MALICIOUS

PDF

90.8 KB Created: 2021-05-10 01:53:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6d3e3cc9852cd31430561b185767c16a SHA-1: d8cffabd1616fa0775623ee941355f99bcb0890a SHA-256: c0caaacf321fd1e0f6093b3296c0b6c1514adb4ff03a64c862d8f84a4313310e
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a strong intent to redirect users to potentially harmful sites. The presence of `utm_term` parameters suggests tracking or campaign-specific lures, common in phishing operations.

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://vilenefex.ru/strik?utm_term=el+lazarillo+de+tormes+resumen+tratado+2
    • http://nomevufaneboja.mypressonline.com/mopabu.pdf
    • http://teksalle.xyz/53172395543ubv4l.pdf
    • https://janepaxe.weebly.com/uploads/1/3/4/0/134097288/559eeaa3.pdf
    • http://kitafoged.medianewsonline.com/ankle_sprain_physical_therapy.pdf
    • http://vetozadep.mywebcommunity.org/how_much_does_an_anesthesiologist_make_in_residency.pdf
    • http://wwnews.site/pexizezatipojewalepopidego9a.pdf
    • http://salet.store/telephone_lady_gaga_ukulele_chords3k8vp.pdf
    • https://nisozamiroxub.weebly.com/uploads/1/3/0/9/130969329/wanakikemiwif_xokole_wikenuwamo.pdf
    • https://girusetobar.weebly.com/uploads/1/3/1/0/131071114/kukiget_demofepumageji_kumasokavofer.pdf
    • http://hidver.com/what_is_the_art_of_thailandkhq6w.pdf
    • http://dithetsen.xyz/junior_waec_syllabusozxg0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/1159dfa1-4c89-4f55-99a9-f23934f56c5a/who_is_sookie_stackhouse_married_to.pdf
    • https://uploads.strikinglycdn.com/files/fae34d77-2f79-405a-9712-691ea0abf326/notawegawenopakegut.pdf
    • https://uploads.strikinglycdn.com/files/91b50a98-2080-47a8-b724-67388cc0658e/doro_7050tl_flip_easy-to-use_cell_phone_for_seniors_white_by_tracfone.pdf
    • https://s3.amazonaws.com/zoromexemuzid/vubunevufu.pdf
    • http://gegagino.epizy.com/55093595042.pdf
    • https://s3.amazonaws.com/jozaponi/dofuxuvoxilefazupogesotu.pdf
    • https://uploads.strikinglycdn.com/files/c1ea24dc-327b-4c6b-bc86-1d24d544d114/1684957708.pdf
    • https://s3.amazonaws.com/sajatofubote/26622485438.pdf
    • https://s3.amazonaws.com/boduxatavepe/what_stocks_to_buy_in_gta_5.pdf
    • http://filutapokupa.epizy.com/anemia_de_celulas_falciformes_diagnostico.pdf
    • http://zarusorujot.epizy.com/chevrolet_suburban_2017_manual.pdf
    • http://lawiferow.myartsonline.com/80212890386.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_off00012409.bin
b6925e2a9f5e46a115bb440da9ab350827a561d512405082b306cac18461ae74		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12409 5112 bytes
font_01_sfnt_off0001355e.bin
4ca15641b23315cbc143001c9b95ddf3aa0e0bc3a564cc3dd6ecc3b9ac1b8793		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1355E 12248 bytes

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