Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab5b2e5e5ff7778b…

MALICIOUS

PDF

76.0 KB Created: 2021-03-18 22:43:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: d95bb9644f7b112af5b125087d136839 SHA-1: bbf51896e18b8513fc1488da800d91f3bb5dfbc2 SHA-256: ab5b2e5e5ff7778bbfe1b6cfca28f6c10ab48b3aea7a63bd33e6b4a55b69fa29
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 payload. It contains numerous embedded URLs pointing to external sites, with several identified as link farms on disposable hosting. The document body is heavily obfuscated, but the presence of URLs and the heuristic firings suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/award?keyword=the+princess+switch+script+pdf PDF link annotation
    • https://romenazojojeles.weebly.com/uploads/1/3/0/7/130775884/ebc33ad111.pdfIn PDF document text
    • http://bapatavusirave.mygamesonline.org/bubakapuvotofigomej.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/Goge6ib/lean_bulk_workout_plan.pdfIn PDF document text
    • https://cdn.sqhk.co/bekutojeke/fMjfhbz/28126024292.pdfIn PDF document text
    • http://xufamorazogubov.sportsontheweb.net/mezababefavamuzazosatuluk.pdfIn PDF document text
    • https://sibevuguz.weebly.com/uploads/1/3/4/8/134859718/xisopizeniw.pdfIn PDF document text
    • http://giliroder.iblogger.org/medical_leave_certificate_for_students.pdfIn PDF document text
    • https://cdn.sqhk.co/gejupajo/2hajhif/swat_team_dog_meme.pdfIn PDF document text
    • https://cdn.sqhk.co/sifajoxojif/bheiijg/olosho_virgin_meaning.pdfIn PDF document text
    • http://gakagebir.mypressonline.com/rebugozedebojine.pdfIn PDF document text
    • http://bajifepeselok.sportsontheweb.net/98072443376.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/883625f7-22e5-4614-8169-d6ed8a89369a/which_country_gives_the_most_foreign_aid_as_a_percentage_of_its_gdp.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cd62182-e028-4191-94f0-ea30eedb6606/vogakeno.pdfIn PDF document text
    • http://jaxojuru.rf.gd/que_tipos_de_obligaciones_hay_en_relacion_a_los_derechos_humanos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08ce1fdd-4550-4b58-b867-f1730387d017/the_wave_2015_full_movie_in_hindi_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06b8f255-cb4f-4144-a9a1-a58c90593581/vocabulary_test_english_beginners.pdfIn PDF document text
    • http://bidexegope.epizy.com/mofidujisi.pdfIn PDF document text
    • http://mefufoseza.rf.gd/intercessory_prayer_requests_catholic.pdfIn PDF document text
    • http://kalumewuvo.rf.gd/napijakoroforuxameragoxe.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_off0000e996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE996 5044 bytes
SHA-256: 3d48473f896ca77507a5527a12056f3edf2972eac485a6172b9c0830d8da2911
font_01_sfnt_off0000fad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD1 11996 bytes
SHA-256: 0dbfb669a055d1c76e6e1458da9004d3597fb8a1094e9a25e40d71bef1103eb9

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