Malicious PDF — malware analysis report

Static analysis result for SHA-256 1883c8948832b726…

MALICIOUS

PDF

67.1 KB Created: 2021-02-26 11:57:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: f35a8e8462ece03a1ce8602c7d8af662 SHA-1: 887b5906763c0cc27def42e0f6eb98d3a2b59703 SHA-256: 1883c8948832b7269072f11f0aee58880f0fd76a6d83d8680b83e12c62abda27
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded URLs, with a critical heuristic firing indicating redirection to known malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious. The document body appears to be obfuscated or corrupted, but the presence of URLs and the heuristic firings strongly suggest a phishing or malware distribution attempt.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/award?keyword=evaluate+int+cos+x+cos2x+cos3xdx In PDF document text
    • http://copyrightreports.com/95166997111fwf0p.pdfIn PDF document text
    • http://spain50off.info/delulaxmcto.pdfIn PDF document text
    • https://cdn.sqhk.co/joxomawezu/rgdmUa2/tropico_5_ps4_money_cheat.pdfIn PDF document text
    • https://cdn.sqhk.co/nibijegun/jihcTgj/mountain_hill_climb_4x4_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/datolabevev/jaCii3m/best_photo_to_video_maker_app_for_android.pdfIn PDF document text
    • https://cdn.sqhk.co/xivomojuf/fOifnKn/paypal_account_can_t_send_money.pdfIn PDF document text
    • http://bibuzikufaje.mygamesonline.org/list_of_emotions_for_speech_therapy.pdfIn PDF document text
    • http://gatorama.fun/nuzejapifawww9x0.pdfIn PDF document text
    • http://lnstagram-copyright-confirms.com/anatomia_de_cabeza_y_cuello_gratiscs96p.pdfIn PDF document text
    • http://igcopyrightverify.com/how_to_thread_singer_sewing_machine_57820cu6r4t.pdfIn PDF document text
    • http://betflixguvenilirmi.com/78011367713lrtu1.pdfIn PDF document text
    • http://dorulezebum.sportsontheweb.net/rujukepubok.pdfIn PDF document text
    • https://cdn.sqhk.co/javukapegami/injajPB/cheap_mudding_four_wheelers_for_sale.pdfIn PDF document text
    • http://dawexefif.getenjoyment.net/fawijosoti.pdfIn PDF document text
    • https://cdn.sqhk.co/gobuwovuv/uBjjLEN/1057978974.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387229/normal_6027fdc157d62.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pozidijapepore.atwebpages.com/cuantos_tipos_de_investigacion_de_mercado_existen.pdfIn PDF document text
    • http://nosigegu.onlinewebshop.net/kill_bill_script_signed.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_off0000c997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC997 5216 bytes
SHA-256: e46fe4ed9b9f7c520059cce8d2e583fc213f8b8c284aa40bcf2bcb9d4a955b29
font_01_sfnt_off0000db76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB76 10376 bytes
SHA-256: 44782b575809b19f5b1c2ce0559520101fd3369744f43aad7905eaa2a516f37c

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