Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ce39ac574cd66d3…

MALICIOUS

PDF

77.2 KB Created: 2021-02-26 07:44:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 168fd810be2a73b4f4a37ae48f7852f6 SHA-1: cf3fe4584c35283e31d1d9f3442e0f69fbb51fb2 SHA-256: 5ce39ac574cd66d3af6fc5efd2cdc43d82b17de74f67d169638513531c600c4a
136 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. Heuristics indicate the presence of suspicious and invisible links pointing to external domains, including one that is part of a phishing lure. The ML classifier also strongly suggests maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to a malicious site, likely for phishing or to download a secondary payload.

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
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://crophysi.ru/strik?utm_term=does+my+samsung+smart+tv+have+hdmi+arc PDF link annotation
    • http://tejovotemikodes.getenjoyment.net/how_to_use_verizon_router_as_extender.pdfIn PDF document text
    • http://managerprogram.live/abiotic_and_biotic_factors_answer_key6ibfg.pdfIn PDF document text
    • https://cdn.sqhk.co/pifajaloro/jbjgDjc/checkers_3d_game_download.pdfIn PDF document text
    • http://nowukusox.mypressonline.com/linkers_and_loaders_download.pdfIn PDF document text
    • http://gexopidikimo.mygamesonline.org/90713336877.pdfIn PDF document text
    • https://cdn.sqhk.co/livefivepa/cicEWrU/enhanced_building_guide_minecraft.pdfIn PDF document text
    • http://copyrightprivacy.site/soundarya_lahari_lyrics_and_meaning_in_englishwzhka.pdfIn PDF document text
    • http://tifoxikutawe.sportsontheweb.net/ragululi.pdfIn PDF document text
    • http://nogurufegu.mygamesonline.org/tecumseh_engine_carburetor_adjustment.pdfIn PDF document text
    • https://cdn.sqhk.co/javukapegami/if03ggt/mobile_wallet_vs_apple_pay.pdfIn PDF document text
    • http://salonlabs.xyz/styx_come_sail_away_piano_sheet_music5yr9s.pdfIn PDF document text
    • http://riratasixok.22web.org/less_than_zero_full_movie_watch_online.pdfIn PDF document text
    • http://lifeshop.pro/manual_wbc_differential_count0xf3a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wukevirenesu/30371864283.pdfIn PDF document text
    • https://s3.amazonaws.com/kudufigunabi/62525344476.pdfIn PDF document text
    • https://s3.amazonaws.com/xefezesebusu/print_as_book_service.pdfIn PDF document text
    • https://s3.amazonaws.com/gumegulaxi/chiari_malformation_pillow_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/tobaziw/athlean_x_workout_sheets.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_off0000f137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF137 5484 bytes
SHA-256: fb962b23c42c6dfb87294fececf64f1ccd6b9643dd8f21d5b8d5e4843d306adf
font_01_sfnt_off000103c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C5 10320 bytes
SHA-256: d3bdc67b442c83fe2cb802a1f2ca15cbfad1cf7de4951f6b6acad4b42842e718

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