Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e07ccb52c2f8d87…

MALICIOUS

PDF

67.1 KB Created: 2021-05-11 04:09:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1632c7f6da554602fd01c9e89819495b SHA-1: b126416539378ee1432edcb579f037c67852510e SHA-256: 5e07ccb52c2f8d87f2f285f8be4c1cc266f0d125c214a9842cc3101864d6448c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to disposable domains and acting as a link farm, suggesting a phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent.

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://vilenefex.ru/strik?utm_term=geometria+analitica+guerra+figueroa+pdf
    • http://christmas-gift.ru/what_are_good_part_time_evening_jobs0t4o7.pdf
    • http://save50it.info/bodyguard_audio_songs_comef0x8y.pdf
    • http://blancop.xyz/bedsheet_manufacturer_in_suratgm9sb.pdf
    • https://rugezanuw.weebly.com/uploads/1/3/1/4/131483337/waseravujefen-wajabulojesa.pdf
    • http://nulivanofika.mygamesonline.org/37629502458.pdf
    • http://niwopofe.scienceontheweb.net/pupifawegomapuzatife.pdf
    • https://mafidusat.weebly.com/uploads/1/3/4/1/134109097/nalivanotodoxubatin.pdf
    • https://gokatejasefe.weebly.com/uploads/1/3/4/6/134650338/98759f61e.pdf
    • http://mmamba.ru/how_much_is_a_psychiatric_evaluationke5mh.pdf
    • http://manamuposa.getenjoyment.net/clinician_administered_ptsd_scale_for_dsm_5_caps_5_past_month.pdf
    • http://kernig.pro/kekeletamujukivezscarx.pdf
    • http://wijetaz.mypressonline.com/bsc_courses_list_download.pdf
    • http://mesanezedid.mypressonline.com/jumbled_words_exercise_with_answers_for_class_10.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/fe1179ec-ffcf-4095-8f2c-722f5d63c141/calculo_volumen_integrales_dobles.pdf
    • https://uploads.strikinglycdn.com/files/5f4cfc91-4996-405b-a0d0-949b31f07059/kisirezududij.pdf
    • http://wovuluvoju.onlinewebshop.net/986190360.pdf
    • http://bosagiriwamokin.onlinewebshop.net/the_casebook_of_sherlock_holmes.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_off0000c90e.bin
3a05133e10252d211b12245733278fd1f009649d7f44ce0017b819b03358eb7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC90E 5328 bytes
font_01_sfnt_off0000db1a.bin
56d1778602ee668367807e553fec74dc875156273e7691f68c95dad333d8b8d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1A 10936 bytes

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