Malicious PDF — malware analysis report

Static analysis result for SHA-256 419ad04f00e9d7be…

MALICIOUS

PDF

82.1 KB Created: 2021-03-23 08:21:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 091fcc1289b5683aca6b385c87bd8a43 SHA-1: 75d7c96d299cc955248a6f016f374b03cdc8b4df SHA-256: 419ad04f00e9d7bedcd047c8112d917b87f27134f5aec30d06c6fcdff805e52b
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, identified as a link farm, with many pointing to disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or SEO manipulation. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://bologen.ru/strik?utm_term=oxford+dictionary+history+definition
    • http://saporik.scienceontheweb.net/liturgical_year_worksheet.pdf
    • https://kenojitoxudu.weebly.com/uploads/1/3/1/3/131383977/39dd8.pdf
    • https://junobinedutuki.weebly.com/uploads/1/3/2/7/132712306/4d9a36.pdf
    • https://remanajuzox.weebly.com/uploads/1/3/1/4/131437778/sobomuzaki.pdf
    • https://moxuzoketo.weebly.com/uploads/1/3/1/1/131164531/gegefigixemenu-gemilidakub-pezubujemameti.pdf
    • https://povejuzulegaje.weebly.com/uploads/1/3/5/3/135301343/tarurixamat_zidiligato.pdf
    • http://nijaxubazaziw.mypressonline.com/37993146327.pdf
    • http://pewadulojuba.mypressonline.com/agenda_escolar_2020_y_2020.pdf
    • http://lifelalulenomip.mygamesonline.org/jajuvarakoxuzotolefadasep.pdf
    • https://riwusivi.weebly.com/uploads/1/3/4/9/134900433/vijitujaleluvowuzif.pdf
    • https://fedonofawok.weebly.com/uploads/1/3/4/8/134881994/napedus_larabomofo_lasufejaj.pdf
    • https://reragoposezexel.weebly.com/uploads/1/3/5/9/135958934/gereweleratisazinoz.pdf
    • https://nitorotejixet.weebly.com/uploads/1/3/6/0/136082153/pobarivejo.pdf
    • https://puzomukasudugun.weebly.com/uploads/1/3/4/8/134865935/kunajiku.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://a7193630-a032-4ee2-b136-33837135b76a.filesusr.com/ugd/fac845_af6b71de99e94ebaa50a7cf207b14fab.pdf?index=true
    • https://s3.amazonaws.com/wixatax/69598549409.pdf
    • https://s3.amazonaws.com/fenatagazise/alter_ego_a1_audio.pdf
    • https://1639490a-f715-481e-9fb1-af38d332269b.filesusr.com/ugd/a59130_3daa71b4bc694610a9b998b304a6a994.pdf?index=true
    • https://s3.amazonaws.com/zafirawit/vamolumaravogisiv.pdf
    • https://s3.amazonaws.com/jitimesolagun/star_wars_blaster_sound_free.pdf
    • https://s3.amazonaws.com/kafises/64987480290.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e864.bin
f9a9da128c9a92052b276dd29fbaf853e1aa2a2dd92269c3324f50b4539367af		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE864 5272 bytes
font_01_sfnt_off0000fa5c.bin
853a0c636e4a7871f4b197bef7d2029ecd577c69a79c10cff167faab7703d4e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5C 11572 bytes
font_02_sfnt_off000121e5.bin
c64f975c7c74378765a15e192890ba001b575443647995d4109c17b56814fb1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121E5 16544 bytes

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